Description
10:04-08Issue 1 en EBS Troubleshooting with the diagnostic lamp 1 712 065 © Scania CV AB 1999, Sweden 114 596 Contents General Diagnostics panel ........................................................3 Diagnostic memory function ......................................3 Driving with output tester ...........................................4 Troubleshooting Description of flash code functions ............................5 Axle configurations.....................................................5 Flash codes..................................................................6 Faults without flash codes...........................................58 Electrical system EBS 2.0 Electrical components, location ..................................60 Circuit paths ................................................................62 Electrical system EBS 2.1 Electrical components, location ..................................66 Circuit paths ................................................................68 Electrical system EBS 2.2 Electrical components, location ..................................74 Circuit paths ................................................................76 Scania Diagnos Troubleshooting with the diagnostic lamp General Diagnostic panel A system for troubleshooting/diagnosis is integrated into EBS. The diagnostic panel is located in the instrument panel and consists of a button to activate and clear the diagnostic function memory and a diagnostic lamp for flash codes. 05_5161 ED C E TC 10_2287 Diagnostic panel, generation 1 A maximum of 15 fault codes can be stored. If a 16th fault occurs, it will replace the one that was stored first. The fault code stored first (the oldest one) is displayed first. All stored fault codes are deleted when the memory is cleared. Clearing fault codes 2 Press the diagnostic button. 3 Turn on the starting voltage and keep the diagnostic button depressed for at least 2 seconds. Diagnostic panel, generation 2 114 595 1 Switch off the starting voltage. 1060t21b.mkr © 05_5161 Diagnostic memory function Scania CV AB 1999, Sweden 3 Scania Diagnos Driving with output tester If fitted on the vehicle, the TC function must be disengaged when driving with the output tester. Activate the diagnostic button for 5 seconds. Starting voltage must be turned on. The output tester function will be disengaged if the starting voltage is turned off or the wheels on the front axle reach a speed of over 8 km/h. Troubleshooting The EBS flash code does not have a configuration code. The button must be pressed for at least 2 seconds to retrieve any flash codes. The power must be turned on with the starter key. The diagnostic lamp is then off for 1.5 seconds before starting to flash. The different series of flashes are separated by a distinct pause. A sequence of flash codes always ends with a completion code of 2 plus 1 flashes. This code indicates that there are no more codes present. Diagnostic flashes must be read while the vehicle is stationary. D 3/2 D= Diagnostic switch pressed for 2 seconds Flash code 3/2 = First stored fault code Flash code 2/2 = Second stored fault code Flash code 2/1 = No fault 2/2 2/1 4 © Scania CV AB 1999, Sweden 1060t21b.mkr 114 485 applies to all system issues. Note: The list of flash codes.1 EBS 2.mkr © Scania CV AB 1999. Sweden 5 .0 and EBS 2. Under each flash code message there is a table stating to which location and to which control module the flash code applies. EBS 2.Scania Diagnos Description of flash code functions Flash codes for control modules have identical flash code messages. to be published. Axle configurations The following illustrations show the locations of the various axles and control modules.2 1060t21b. the control unit should be renewed.mkr . 6 © Scania CV AB 1999.Flash codes Flash codes Flash code: 2/1 Fault: No fault. If the fault code recurs after the fault memory has been cleared. The system operates in backup mode. Sweden 1060t21b. Cause: Self-test interrupted or data processing fault. Remarks: The ABS warning lamp and the lamp for low brake pressure are on. This is also recommended if the fault recurs during normal driving. Cause: Remarks: Action: Flash code: 2/2 Fault: Internal fault in the control unit. Action: Clear the fault memory. Sweden 7 . Cause: Self-test interrupted or data processing fault. The system operates in backup mode. 1060t21b.mkr © Scania CV AB 1999. the control unit should be renewed. If the fault code recurs after the fault memory has been cleared. This is also recommended if the fault recurs during normal driving. Action: Clear the fault memory. Remarks: The ABS warning lamp and the lamp for low brake pressure are on.Flash codes Flash code: 2/3 Fault: Internal fault in the control unit. The system operates in backup mode. Internal fault in the control unit. Action: Clear the fault memory. Remarks: The ABS warning lamp and the lamp for low brake pressure are on.mkr .Flash codes Flash code: 2/4 Fault: Internal fault in the control unit. This is also recommended if the fault recurs during normal driving. If the fault code recurs after the fault memory has been cleared. the control unit should be renewed. Sweden 1060t21b. Cause: Self-test interrupted or data processing fault. 8 © Scania CV AB 1999. If the fault code recurs after the fault memory has been cleared. the control unit should be renewed.mkr © Scania CV AB 1999. Sweden 9 . 1060t21b. This is also recommended if the fault recurs during normal driving.Flash codes Flash code: 2/5 Fault: Internal fault in the control unit. Cause: Self-test interrupted or data processing fault. Remarks: The ABS warning lamp and the lamp for low brake pressure are on. Action: Clear the fault memory. The system operates in backup mode. Remarks: The ABS warning lamp and the lamp for low brake pressure are on. The system operates in backup mode. Cause: Self-test interrupted or data processing fault. Flash code: 2/9 Fault: Internal fault in the control unit. This should also be done if the fault recurs during normal driving. If the fault recurs after reprogramming. Cause: Check sum error in the EEPROM. Sweden 1060t21b. Action: Reprogram the control unit.mkr . Remarks: The ABS warning lamp and the lamp for low brake pressure are on. The system operates in backup mode.Flash codes Flash code: 2/6 Fault: Internal fault in control unit. the control unit should be renewed. 10 © Scania CV AB 1999. This is also recommended if the fault recurs during normal driving. Flash code: 2/10 Fault: Internal fault in the control unit. If the fault code recurs after the fault memory has been cleared. 1060t21b. This is also recommended if the fault recurs during normal driving. the control unit should be renewed. Cause: Self-test interrupted or data processing fault.Flash codes Action: Clear the fault memory. Action: Clear the fault memory. Remarks: The ABS warning lamp and the lamp for low brake pressure are on. The system operates in backup mode. the control unit should be renewed. Sweden 11 .mkr © Scania CV AB 1999. If the fault code recurs after the fault memory has been cleared. ABS lamps are on.mkr . Remarks: The vehicle has no ABS function. Action: Clear the fault memory and reprogram the control unit. 12 © Scania CV AB 1999. the control unit should be renewed.Flash codes Flash code: 2/11 Fault: Internal fault in the control unit. This is also recommended if the fault recurs during normal driving. Cause: Incorrect wheel compensation value. If the fault code recurs after the fault memory has been cleared. Sweden 1060t21b. the control unit should be renewed. If the fault recurs after reprogramming. Sweden 13 . Cause: Check sum error in the EEPROM.mkr © Scania CV AB 1999. Remarks: ABS warning lamp is on.Flash codes Flash code: 2/12 Fault: Incorrect service brake valve characteristic. 1060t21b. Action: Reprogram the control unit. This should also be done if the fault recurs during normal driving. the control unit should be renewed. Remarks: The ABS warning lamp and the lamp for low brake pressure are on. Action: Clear the fault memory. 14 © Scania CV AB 1999. If the fault code recurs after the fault memory has been cleared. Flash code: 2/14 Fault: Internal fault in the control unit. Sweden 1060t21b.mkr . Cause: Software not compatible. This should also be done if the fault recurs during normal driving. Remarks: The ABS warning lamp and the lamp for low brake pressure are on. Cause: Self-test interrupted or data processing fault. the control unit should be renewed.Flash codes Flash code: 2/13 Fault: Internal fault in the control unit. The system operates in backup mode. The system operates in backup mode. If the fault recurs after reprogramming. This is also recommended if the fault recurs during normal driving. Action: Reprogram the control unit. 45 V. Check the connections to earth. Remarks: The ABS warning lamp and the lamp for low brake pressure are on. Cause: The voltage between pins B-2 and B-3 of the control unit is out of range. have different voltages.55 V and 5. The voltage should be between 4. Sweden 15 . pin A-10 (GND) and pin A-12 (GND_MO). The system operates in backup mode. This fault code can also be generated if the earth connections.Flash codes Flash code: 3/2 Fault: Pedal position sensor voltage level too low or too high. Check the control unit's connection to earth. The cable may be shorted to +24 V or to earth. Action: Check the 5 V cable to the pedal position sensor in D39 (pin B-2). 1060t21b.mkr © Scania CV AB 1999. pin A-12. Take a voltage reading between pins B-2 and B-3 of the control unit. mkr .2 kohms . Permitted potentiometer resistance: Between pin 2 and pin 1: 4. Sweden 1060t21b.9 kohms 2. Permitted voltage range in the potentiometer signal.4. Note: The connector must be detached from the service brake valve when measuring.3 -> 4.Flash codes Flash code: 3/3 Fault: Incorrect signal from pedal position sensor in service brake valve. Between pin B-4 and pin B-3 (SM2): 0. Between pin 3 and pin 1: 4. Remarks: The ABS warning lamp and the lamp for low brake pressure are on. Check for open circuit or short circuit. Measure the power supply at the control unit.1 kohms. measured at the control unit: Between pin B-7 and pin B-3 (SM1): 0. Measure the resistance of the potentiometer in the service brake valve.5 V. Cause: The control unit has sensed that the signal from the pedal position sensor is out of range. Action: Check cables and connections between the control unit and potentiometer.7.5 V. The system operates in backup mode.5 kohms. 16 © Scania CV AB 1999. V .3. Flash codes Flash code: 3/5 Fault: Incorrect signal from load-sensing pressure sensor in air bellows.3 V -> 4.7 V. 1060t21b. The system does not use the load-sensing function but operates at an axle pressure of approx. Action: Check the cables and connectors between the control module and the load-sensing pressure sensor in air bellows (T46).mkr © Scania CV AB 1999. Check for open circuit or short circuit. Sweden 17 . 8 tons. Cause: The voltage between pins F-2 and F-1 of the control module is out of range. Remarks: ABS warning lamp is on. Permitted voltage from load-sensing pressure sensor in air bellows between pin F-2 and pin F-1 on control module: 0. Action: Clear the fault memory. Remarks: The EBS function is not affected by this fault. Cause: Lamp defective. Check the lamp. 18 © Scania CV AB 1999.Flash codes Flash code: 4/4 Fault: Incorrect feedback signal (response signal) from the driver stage of the wear warning lamp (W18). The control unit nonetheless continuously attempts to activate the ABS warning lamp.mkr . fault in driver stage for warning lamp W18 or open-circuit in the cable to the lamp. If the fault recurs after the memory has been cleared. Check the wiring for an open circuit or shorting to earth or +24 V. Sweden 1060t21b. the control unit should be renewed. If the fault recurs after the memory has been cleared and there are no faults in the wiring.Flash codes Flash code: 4/5 Fault: Incorrect feedback signal (response signal) from the driver stage of the ABS warning lamp W8.mkr © Scania CV AB 1999. The control unit nonetheless continuously attempts to activate the ABS warning lamp. Cause: Lamp defective. Sweden 19 . Remarks: The EBS function is not affected by this fault. Action: Clear the fault memory. 1060t21b. Check the wiring for an open circuit or shorting to earth or +24 V. fault in driver stage for warning lamp W8 or open-circuit in the cable to the lamp. the control unit should be renewed. The warning lamp for low brake pressure is on. Check the lamp. Yellow ABS warning lamp is on. Action: Clear the fault memory. the control unit should be renewed. Cause: Short-circuit to +24 volt or fault in driver stage for the red warning lamp for low brake pressure or an open circuit in the cable to the lamp.mkr . Check the wiring for a short to +24 V. If the fault recurs after the memory has been cleared and there is no shortcircuit.Flash codes Flash code: 4/6 Fault: Incorrect feedback signal (response signal) from the driver stage for the red warning lamp for low brake pressure. The control unit nonetheless continuously attempts to activate the central warning lamp. 20 © Scania CV AB 1999. Sweden 1060t21b. Remarks: The EBS function is not affected by this fault. Sweden 21 .mkr © Scania CV AB 1999. 1060t21b. Action: Should not occur on Scania vehicles.Flash codes Flash code: 4/7 Fault: Should not occur on Scania vehicles. Remarks: Should not occur on Scania vehicles. Cause: Should not occur on Scania vehicles. Cause: Fault in the driver stage for the control modules or an open-circuit in the cable to one of the control modules.mkr .Flash codes Flash code: 4/8 Fault: Short circuit in any of the control unit driver stages for control modules. If the fault recurs after the memory has been cleared. The system operates in backup mode. the control unit should be renewed. Sweden 1060t21b. 22 © Scania CV AB 1999. Action: Clear the fault memory. Remarks: The ABS warning lamp and the lamp for low brake pressure are on. Check the wiring for an open circuit or shorting to earth or +24 V. mkr © Scania CV AB 1999. Cause: The EBS control unit has detected that the retarder control unit has not responded to the CAN signal within the specified time. The system is operative. Check the retarder control unit for normal operation. Remarks: ABS warning lamp is on. but without engine control function. Sweden 23 .Flash codes Flash code: 6/1 Fault: Response time too long for signal between EBS and retarder. Action: Check for open or short circuit in the CAN cable between EBS and the retarder control unit. 1060t21b. Cause: The EBS control unit has detected that the EDC control unit has not responded to the CAN signal within the specified time. but without engine control function. Action: Check for open or short circuit in the CAN cable between the EBS and the EDC control unit. The system is operative. 24 © Scania CV AB 1999. Remarks: ABS warning lamp is on.Flash codes Flash code: 6/6 Fault: Response time too long for signal between EBS and EDC. Sweden 1060t21b. Check the EDC control unit for normal operation.mkr . axle 1 Right-hand wheel. axle 4 Left-hand wheel. 10/1. 11/1 Fault: Fault in ABS sensor/pulse wheel or wiring. 1060t21b.Flash codes Flash code: 7/1. Note: All wheels must be turning (including those on axle 3) in order for the ABS lamp to go out. 9/1. Flash code 7/1 8/1 9/1 10/1 11/1 Location Left-hand wheel. Cause: The control unit has detected that signals from the wheel sensor are missing at speeds above 18 km/h or that the signal from the wheel sensor exceeds 40 km/h when no speed is recorded by any other wheel sensor. axle 3. The TC function is disengaged. 8/1. Remarks: ABS warning lamp is on. The signal from the wheel sensor is recorded in the control module which then sends it to the control unit.mkr © Scania CV AB 1999. Sweden 25 . axle 2 Right-hand wheel. axle 3 Left-hand wheel. mkr . Measure the wheel sensor resistance. 26 © Scania CV AB 1999. 9/2. Note: All wheels must be turning (including those on axle 3) in order for the ABS lamp to go out. axle 1 Left-hand wheel. 8/2. Flash code: 7/2. Resistance should be 950 -1930 ohm. axle 4 Right-hand wheel. axle 3. The TC function is disengaged. The signal from the wheel sensor is recorded in the control module which then sends it to the control unit. axle 3 Right-hand wheel. Right-hand wheel. Flash code 7/2 8/2 9/2 10/2 11/2 12/2 Location Left-hand wheel. axle 2 Right-hand wheel. 10/2. Remarks: ABS warning lamp is on. 11/2. If a fault code recurs after it has been cleared: Check cables and connections between the control module and wheel sensor. 12/2 Fault: Fault in ABS sensor/pulse wheel or wiring. axle 3 Cause: The control unit has detected that signals from the wheel sensor are missing at speeds above 18 km/h or that the signal from the wheel sensor exceeds 40 km/h when no speed is recorded by any other wheel sensor.Flash codes Action: Check the fault codes after driving. Sweden 1060t21b. Resistance should be 950 -1930 ohm. Measure the wheel sensor resistance. 1060t21b. If a fault code recurs after it has been cleared: Check cables and connections between the control module and wheel sensor. Sweden 27 .mkr © Scania CV AB 1999.Flash codes Action: Check the fault codes after driving. Flash codes Flash code: 7/3, 8/3, 9/3, 10/3, 11/3, 12/3 Fault: Incorrect voltage to wear sensor. Flash code 7/3 8/3 9/3 10/3 11/3 Cause Single control module, axles 1 and 4 left-hand side Single control module, axles 1 and 4 right-hand side Double control module, axle 2 left-hand side Double control module, axle 2 right-hand side Double control module, axle 3 left-hand side, single control module, tag axle Double control module, axle 3 right-hand side 12/3 Cause: Short-circuit or open-circuit. Remarks: Warning lamp for brake pad wear is on. The signal from the wear sensors is recorded in the control module which then sends the signal to the control unit. 28 © Scania CV AB 1999, Sweden 1060t21b.mkr Flash codes Action: 1. Check the cables and connections between the control module and wear sensor. 2. Take a voltage reading (between pins 1 and 4 of the control module). The voltage should be 5 +/-0.45 volts. Use a multimeter with recording function to take the voltage reading. 1060t21b.mkr © Scania CV AB 1999, Sweden 29 Flash codes Flash code: 7/4 ,8/4, 9/4, 10/4, 11/4, 12/4 Fault: Internal fault in the control module or fault in the air supply to the control module. Flash code 7/4 8/4 9/4 10/4 11/4 Control module Single control module, axles 1 and 4 left-hand side Single control module, axles 1 and 4 right-hand side Double control module, axle 2 lefthand side Double control module, axle 2 right-hand side Double control module, axle 3 lefthand side, single control module, tag axle Double control module, axle 3 right-hand side 12/4 Cause: Implausible value from the pressure sensor in the control module. Remarks: The warning lamps for ABS and low brake pressure are on. The control module is disengaged by the control unit and braking of both wheels on the axle concerned is carried out by the pneumatic brake system via the back-up circuit. In addition, the ABS, the TC functions and the load-sensing system become inoperative. 30 © Scania CV AB 1999, Sweden 1060t21b.mkr Flash codes Action: Check the compressed air lines to the control module. Check the control module for normal operation. Clear the fault code memory. If the fault recurs, renew the control module. 1060t21b.mkr © Scania CV AB 1999, Sweden 31 axles 1 and 4 right-hand side Double control module.Flash codes Flash code: 7/5. 32 © Scania CV AB 1999. Remarks: The ABS warning lamp and the lamp for low brake pressure are on. the ABS and TC functions and the load-sensing system become inoperative. 8/5. axle 2 right-hand side Double control module.mkr . axle 3 lefthand side. axle 2 lefthand side Double control module. 9/5. single control module. Flash code 7/5 8/5 9/5 10/5 11/5 Control module Single control module. The control modules are connected via their own CAN cables. axles 1 and 4 left-hand side Single control module. Sweden 1060t21b. In addition. which are separate from the other CAN cables. 11/5. 10/5. The control module is disengaged by the control unit and braking of both wheels on the axle concerned is carried out by the pneumatic brake system via the back-up circuit. 12/5 Fault: No CAN signal from control module. tag axle Double control module. axle 3 right-hand side 12/5 Cause: The control unit cannot contact the control module via the CAN brake cables. Sweden 33 . Check the connections between the control unit and control module. 1060t21b. earth and power cables to the control module.Flash codes Action: Check the CAN.mkr © Scania CV AB 1999. tag axle Double control module. axle 2 right-hand side Double control module. Sweden 1060t21b. axles 1 and 4 right-hand side Double control module. 8/6. axle 3 left-hand side. The control module is disengaged by the control unit and braking of both wheels on the axle concerned is carried out by the pneumatic brake system via the back-up circuit. the ABS and TC functions and the load-sensing system become inoperative.mkr . Remarks: The ABS warning lamp and the lamp for low brake pressure are on. axle 2 left-hand side Double control module. 9/6. single control module. 11/6. In addition.Flash codes Flash code: 7/6. 12/6 Fault: The control module is not compatible with the control unit. axles 1 and 4 left-hand side Single control module. axle 3 right-hand side 12/6 Cause: The software in the control module is not compatible with the software in the control unit. Flash code 7/6 8/6 9/6 10/6 11/6 Control module Single control module. 34 © Scania CV AB 1999. 10/6. Sweden 35 .mkr © Scania CV AB 1999.Flash codes Action: Either replace the control module with one that is compatible with the control unit in the vehicle or replace the control unit with one that is compatible with the control modules in the vehicle. 1060t21b. single control module. but has been unsuccessful. axle 2 right-hand side Double control module. Flash code 7/7 8/7 9/7 10/7 11/7 Control module Single control module. 12/7 Fault: The control module cannot send the requested pressure to the brake chamber. Sweden 1060t21b. the ABS and TC functions and the load-sensing system become inoperative. (In order for the flash code to be generated. This fault code will be prevented if the control unit senses that the low-pressure indicator indicates low supply pressure.Flash codes Flash code: 7/7. axle 2 left-hand side Double control module. The control module is disconnected by the control unit and braking of the wheel is carried out by the pneumatic brake system via the backup circuit. In addition. axles 1 and 4 left-hand side Single control module. tag axle Double control module. axle 3 right-hand side 12/7 Cause: The control module has attempted to send the requested pressure to the brake cylinder for some time. axles 1 and 4 right-hand side Double control module. Remarks: The ABS warning lamp and the lamp for low brake pressure are on. the requested pressure must be below 4 bar). 9/7. 36 © Scania CV AB 1999.mkr . 11/7. axle 3 left-hand side. 10/7. 8/7. 4. Check that brake pressure in the front and rear circuits is normal. 5.mkr © Scania CV AB 1999. Check the control module for normal operation. Check the cable between the low-pressure indicator and the control unit. Check the low-pressure indicator.Flash codes Action: 1. Sweden 37 . 2. Note: The value from the control modules' pressure sensors can be read out using Scania Diagnos. 1060t21b. 3. Check the supply line to the control module. the ABS and TC functions and the load-sensing system become inoperative. tag axle Double control module. 8/8. The control module is disengaged by the control unit and braking of both wheels on the axle concerned is carried out by the pneumatic brake system via the back-up circuit. axle 3 right-hand side 12/8 Cause: Automatic self-test in the control module failed. Remarks: The ABS warning lamp and the lamp for low brake pressure are on.mkr . 9/8. axle 3 left-hand side. axles 1 and 4 right-hand side Double control module. Sweden 1060t21b.Flash codes Flash code: 7/8. In addition. single control module. Flash code 7/8 8/8 9/8 10/8 11/8 Control module Single control module. 38 © Scania CV AB 1999. 11/8. axle 2 right-hand side Double control module. axles 1 and 4 left-hand side Single control module. axle 2 left-hand side Double control module. 12/8 Fault: Internal fault in the control module. 10/8. Sweden 39 .mkr © Scania CV AB 1999. If the fault code recurs after it has been cleared. the control module must be renewed. 1060t21b.Flash codes Action: Clear the fault code memory. Remarks: ABS warning lamp is on. 9/9. The TC function becomes inoperative. Action: Check the tyre sizes on front and rear axles and change any tyres that are not of the right size. Sweden 1060t21b. 8/9. ABS control becomes inoperative on this wheel. axle 4 Left-hand wheel. Location Left-hand wheel. 11/9 Fault: The rolling circumference differs too much from that of the other wheels. axle 3 Left-hand wheel. 10/9. axle 2 Right-hand wheel. axle 3. Flash code 7/9 8/9 9/9 10/9 11/9 Cause: The control unit has sensed that the rolling circumference differs from the mean value for the other wheels by more than 9%. The rolling circumference differs too much from that of the other wheels. 40 © Scania CV AB 1999.Flash codes Flash code: 7/9. axle 1 Right-hand wheel.mkr . 11/10. Remarks: ABS warning lamp is on. ABS control becomes inoperative on this wheel. axle 3 Right-hand wheel. axle 3 1060t21b. Action: Check the tyre sizes on front and rear axles and change any tyres that are not of the right size. 10/10. axle 2 Right-hand wheel. 8/10. axle 1 Left-hand wheel. Sweden 41 . 12/10 Fault: The rolling circumference differs too much from that of the other wheels. 9/10.Flash codes Flash code: 7/10. axle 3 Right-hand wheel.mkr © Scania CV AB 1999. The TC function becomes inoperative. axle 4 Right-hand wheel. Location Left-hand wheel. Flash code 7/10 8/10 9/10 10/10 11/10 12/10 Cause: The control unit has sensed that the rolling circumference differs from the mean value for the other wheels by more than 9%. Check for open circuit or short circuit. Remarks: ABS warning lamp is on. Sweden 1060t21b.mkr . Action: Check the cables and connectors between the control module and the load-sensing pressure sensor in air bellows (T46).Flash codes Flash code: 9/11. Cause: The voltage between pins F-1 and F-4 of the double control module is out of range. Permitted voltage to load-sensing pressure sensor in air bellows between pin F-1 and pin F4 on double control module: 4. The system does not use the load-sensing function but operates at full axle pressure.45 V. 10/11 Fault: Incorrect signal from load-sensing pressure sensor in air bellows.55 V -> 5. 42 © Scania CV AB 1999. The system enters backup mode for axle. 11/12 Fault: Pressure difference between control modules. Action: Check the pressure of each control module. Flash code 7/12 9/12 11/12 Location Shaft 1 Shaft 2 Shaft 3 Cause: If a pressure difference > 0. Sweden 43 . 1060t21b.mkr © Scania CV AB 1999.8 bar occurs for more than 3 seconds between the control modules. Renew the defective control module. The current pressure values can be obtained by using Scania Diagnos. 9/12. Remarks: The ABS warning lamp and the lamp for low brake pressure are on.Flash codes Flash code: 7/12. Sweden 1060t21b.mkr . axle 2 left-hand side Double control module. axle 3 left-hand side. tag axle Double control module. leaves a residual pressure of more than 0.8 bar. 10/13. The fault code is generated when the pulse test. 44 © Scania CV AB 1999. Remarks: The warning lamp for low brake pressure is on.8 bar during the pulse test. 8/13. 12/13 Fault: Automatic pulse test in the control module failed. axles 1 and 4 left-hand side Single control module. 9/13. axle 2 right-hand side Double control module. which starts automatically when the ignition is switched on.Flash codes Flash code: 7/13. 11/13. single control module. This may occur when an air line is blocked or if the control module is defective. Flash code 7/13 8/13 9/13 10/13 11/13 Control module Single control module. axle 3 right-hand side 12/13 Cause: The control module has sensed a residual pressure of more than 0. axles 1 and 4 right-hand side Double control module. 1060t21b. 3.mkr © Scania CV AB 1999. 2. Check that the air can pass freely through the air lines to the control module. Check the control module for normal operation. Sweden 45 . Renew the control module.Flash codes Action: 1. axle 2 left-hand side Double control module. axles 1 and 4 right-hand side Double control module. In addition. tag axle Double control module. Internal fault in the control module.Flash codes Flash code: 7/14. axle 3 left-hand side. axles 1 and 4 left-hand side Single control module. 12/14 Fault: Internal fault in the control module or fault in the air supply to the control module. the ABS and TC functions and the load-sensing system become inoperative. 8/14. Defective service brake valve. single control module. Flash code 7/14 8/14 9/14 10/14 11/14 Control module Single control module. The fault occurs if the compressed air lines are closed or dirty. 46 © Scania CV AB 1999. 2. Remarks: The ABS warning lamp and the lamp for low brake pressure are on. axle 2 right-hand side Double control module. 9/14. 10/14.mkr . The control module is disengaged by the control unit and braking of both wheels on the axle concerned is carried out by the pneumatic brake system via the back-up circuit. axle 3 right-hand side 12/14 Cause: 1. Sweden 1060t21b. 11/14. 3. Check the pressure in port 4 (backup circuit). 3. Check the control module for normal operation. 2.mkr © Scania CV AB 1999. Renew the control module. 1060t21b. Check that the air can pass freely through the air lines to the control module. Sweden 47 . 4.Flash codes Action: 1. 48 © Scania CV AB 1999. Action: Clear fault codes. Sweden 1060t21b.Flash codes Flash code: 13/1 Fault: Internal fault in trailer control module to trailer. Cause: Remarks: ABS warning lamp is on.mkr . Renew the trailer control module if the fault code recurs. Trailer control module is supplied with voltage. EBS function without limitations in the vehicle. EBS function without limitations in the vehicle. Action: Clear fault codes. Renew the trailer control module if the fault code recurs.Flash codes Flash code: 13/2 Fault: Internal fault in the trailer control module. 1060t21b. Trailer control module is supplied with voltage. Sweden 49 .mkr © Scania CV AB 1999. Cause: Remarks: ABS warning lamp is on. EBS function without limitations in the vehicle. the reading from the pressure sensor should be 0 bar. 50 © Scania CV AB 1999. This value can be read out using Scania Diagnos. when the service brake is not applied. Remarks: ABS warning lamp is on. Check the compressed air lines to the trailer control module.mkr . Sweden 1060t21b. Renew the trailer control module if the fault code recurs. Check the trailer control module for normal operation. The control module is not supplied with voltage. Action: Clear fault codes.Flash codes Flash code: 13/4 Fault: Incorrect pressure value in trailer control module Cause: The trailer control module has recorded an implausible value from the pressure sensor when braking. 1060t21b.Flash codes Flash code: 13/5 Fault: No CAN signal from the trailer control module. Action: Clear fault codes. The trailer control module is not supplied with voltage. EBS function without limitations in the vehicle. Cause: Remarks: ABS warning lamp is on. Renew the trailer control module if the fault code recurs. Sweden 51 .mkr © Scania CV AB 1999. Flash codes Flash code: 13/6 Fault: The software in the control unit is not compatible with the trailer control module. Sweden 1060t21b.mkr . Cause: Remarks: ABS warning lamp is on. Action: Replace the control unit or trailer control module with a unit containing the correct software. EBS function without limitations in the vehicle. 52 © Scania CV AB 1999. The trailer control module is not supplied with voltage. ABS warning lamp is on. Remarks: The current pressure is read out using Scania Diagnos 2. EBS function without limitations in the vehicle. Sweden 53 . Renew the trailer control module if the fault persists. A pressure of <4 bar indicates a fault. 1060t21b. Action: Check the function of the trailer control module.Flash codes Flash code: 13/7 Fault: Internal fault in the trailer control module. Check the compressed air supply to the trailer control module.mkr © Scania CV AB 1999. Cause: The module has not recorded a sufficiently high air pressure for a long period. The trailer control module is not supplied with voltage. Check the cables for the trailer control module power supply and earth. Check the cables for the trailer control module CAN communication. Action: Clear the fault code. The trailer control module is not supplied with voltage.Flash codes Flash code: 13/8 Fault: Internal fault in the trailer control module. EBS function without limitations in the vehicle. Sweden 1060t21b. Cause: Remarks: ABS warning lamp is on. 54 © Scania CV AB 1999.mkr . Sweden 55 . Cause: Remarks: ABS warning lamp is on. Check the cables for the trailer control module CAN communication.mkr © Scania CV AB 1999. Check the cables for the trailer control module power supply and earth. EBS function without limitations in the vehicle. Action: Clear the fault code. The trailer control module is not supplied with voltage. 1060t21b.Flash codes Flash code: 13/9 Fault: Internal fault in the trailer control module. Sweden 1060t21b.5 seconds. The pressure difference has been >1. Cause: The system has recorded a too high pressure difference between the trailer control module and the concerned control unit in the axle control module. Remarks: ABS warning lamp is on.Flash codes Flash code: 13/12 Fault: The system has recorded a too high pressure difference between the trailer control module and the axle control module. Check the compressed air supply to the trailer control module.2 bar for more than 2.mkr . 56 © Scania CV AB 1999. EBS function without limitations in the vehicle. Renew the trailer control module if the fault persists. Action: Check the function of the trailer control module. The trailer control module is not supplied with voltage. Cause: There has been an interruption in the CAN signal between EBS. Action: Check for open or short circuit in the CAN cables between EBS and EDC. but without engine control function. Remarks: ABS warning lamp is on.Flash codes Flash code 15/10 Fault: Interruption in CAN signal to EDC and Retarder. EDC and Retarder. 1060t21b.mkr © Scania CV AB 1999. Sweden 57 . The system is operative. but without engine control function. The system is operative. Remarks: ABS warning lamp is on.mkr . Sweden 1060t21b.Flash codes Flash code 15/11 Fault: Response time too long for CAN signal between EBS and EDC. Action: Check for open or short circuit in the CAN cable between EBS and EDC. Faults without flash codes Type of fault Connection to trailer in 1-conductor mode ECU not connected to cable harness No power to EBS system Control signal from trailer interface Low or high voltage Warning lamp Yellow Yellow+red Red Red Yellow+red 58 © Scania CV AB 1999. Cause: The EBS control unit has detected that the EDC control unit has not responded to the CAN signal within the specified time. Check the EDC control unit for normal operation. Sweden 59 .mkr © Scania CV AB 1999.1060t21b. S95 W3. W16.0 Component No. EBS 2. B50.mkr 103 113 T40 B52 B53 . B51 V82 T14 V85 V84 T13 Electrical components. Sweden 1060t22b. O 4 T42 B56 B57 T46 C92 V83 T12 D39 T11 T39. O 1. 103 172 113 109 159 Service brake valve EBS 60 © Scania CV AB 1999.0 Electrical components. W8. W15. 64. location P2 C56 R1 G11 C8 C93 C94 C95 C98 G13 E43 B54 B55 T41 E46 G 4 G18 S90 . 84.0 Electrical system EBS 2.Electrical system EBS 2. B50/B51 B52/53 B54/55 B56/57 C8 C56 C92 C93 C94 C95 C98 D39 E43 E46 Component description Brake pad wear wire Brake pad wear wire Brake pad wear wire Brake pad wear wire Connector Terminal block Connector Connector Connector Connector Connector Potentiometer Control unit Trailer sensing unit Axle 1 LH Axle 1 RH axle 2 LH Axle 2 RH For CAN and diagnosis Trailer socket for ABS Circuit 6 42 56 92 161 138 169 14. 34. W18. Electrical system EBS 2. 172 13. 151 165 117 129 24 27 74 77 103 2 45 52 97 12 31 62 81 153 153 153 134 TC OFFROAD Diagnosis Axle 1 LH Axle 1 RH Axle 2 LH Axle 2 RH Axle 1 LH Axle 1 RH Axle 2 LH Axle 2 RH Axle 1 LH Axle 1 RH Axle 2 LH Axle 2 RH TC ABS/truck ABS/trailer Brake pad wear 1060t22b.0 Component No. 130 11 150. G4 G11 G13 G18 O1 P2 R1 S90 S95 T11 T12 T13 T14 T46 T39 T40 T41 T42 V82 V83 V84 V85 W3 W8 W15 W18 Component description Ground terminal Ground terminal Ground terminal Ground terminal Instrument cluster Central electric unit Flasher relay Switch Switch Wheel sensor Wheel sensor Wheel sensor Wheel sensor Pressure sensor Wear sensor Wear sensor Wear sensor Wear sensor Control module Control module Control module Control module Warning lamp Warning lamp Warning lamp Information lamp Circuit 118. Sweden 61 .mkr © Scania CV AB 1999. Circuit paths.0 Circuits Circuit paths 1 .25 62 © Scania CV AB 1999.0 Wiring diagrams.mkr . EBS 2. EBS 2. Sweden 1060t22b. EBS 2.Circuit paths. Sweden 63 .75 1060t22b.mkr © Scania CV AB 1999.0 Circuit paths 26 .50 Circuit paths 51 . EBS 2.100 Circuit paths 101 .Circuit paths.mkr . Sweden 1060t22b.0 Circuit paths 76 .125 64 © Scania CV AB 1999. Sweden 65 .0 Circuit paths 126 . EBS 2.150 Circuit paths 151 .175 1060t22b.mkr © Scania CV AB 1999.Circuit paths. W16. 73 15 12 Service brake valve EBS 66 © Scania CV AB 1999. location W3. W15. W8. S95 V86 T46 C92 B54 B55 T41 V83 T12 D39 T11 T39.Electrical system EBS 2. O 4 T42 B56 B57 P2 C56 R1 G11 C8 C93 C94 C95 C98 G13 E43 E46 G 4 G18 S90 . W18. O 1. B50. 140.mkr 108 577 T40 B52 B53 . 158. 108 5.1 Electrical components. 182 68. Sweden 1060t23b.1 Electrical system EBS 2. B51 V82 T14 V85 V84 T13 Electrical components in EBS Component No. B50/51 B52/53 B54/55 B56/57 B64/65 B66/67 C8 C56 C92 C93 C94 C95 C98 D39 E43 Component description Brake pad wear wire Brake pad wear wire Brake pad wear wire Brake pad wear wire Brake pad wear wire Brake pad wear wire Connector Junction block Connector Connector Connector Connector Connector Potentiometer Control unit Axle 1 LH Axle 1 RH Axle 2 LH Axle 2 RH Axle 3 LH Axle 3 RH For CAN and diagnosis Trailer socket for ABS Circuit path 82 116 135 166 210 194 60 40 68 90. E46 G4 G11 G13 G18 O1 R1 S90 S95 T11 T12 T13 T14 T28 T30 T39 T40 T41 T42 T46 T51 T52 V82 V83 V84 V85 V86 W3 W8 W15 W18 Component description Electronic unit Ground terminal Ground terminal Ground terminal Ground terminal Instrument cluster Flasher relay Switch Brake pad wear Wheel sensor Wheel sensor Wheel sensor Wheel sensor Wheel sensor Wheel sensor Wear sensor Wear sensor Wear sensor Wear sensor Pressure sensor Wear sensor Wear sensor Control module Control module Control module Control module Control module Warning lamp Warning lamp Warning lamp Warning lamp Trailer sensing TC Off Road Flash diagnosis Axle 1 LH Axle 1 RH Axle 2 LH Axle 2 RH Axle 3 LH Axle 3 RH Axle 1 LH Axle 1 RH Axle 2 LH Axle 2 RH air suspension. 31 88 49. Sweden 67 . 72 89 53 66 20 31 97 103 147 154 219 178 79 122 128 172 6 207 197 90 107 137 156 180 53 53 55 36 1060t23b.mkr © Scania CV AB 1999.Electrical system EBS 2.1 Component No. rear Axle 3 LH Axle 3 RH Axle 1 LH Axle 1 RH Axle 2 LH Axle 2 RH Axle 3 TC ABS/truck ABS/trailer Brake pad wear Circuit path 60 19. 1 Wiring diagrams Circuit paths. Sweden 1060t23b. EBS 2.1 Circuit paths 1 .25 68 © Scania CV AB 1999.mkr .Circuit paths. EBS 2. 75 1060t23b. Sweden 69 .50 Circuit paths 51 .Circuit paths.1 Circuit paths 26 .mkr © Scania CV AB 1999. EBS 2. EBS 2. Sweden 1060t23b.1 Circuit paths 76 .125 70 © Scania CV AB 1999.mkr .Circuit paths.100 Circuit paths 101 . Circuit paths. EBS 2.150 Circuit paths 151 .175 1060t23b.mkr © Scania CV AB 1999.1 Circuit paths 126 . Sweden 71 . EBS 2.1 Circuit paths 176 . Sweden 1060t23b.200 Circuit paths 201 .mkr .225 72 © Scania CV AB 1999.Circuit paths. Circuit paths. EBS 2.mkr © Scania CV AB 1999. Sweden 73 .1 1060t23b. W16. 22. 10.2 Electrical system EBS 2. C6 C8 C56 C92 C93 C94 C95 D34 D39 E43 E46 G4 G13 G18 Component description Connector Connector Junction block Connector Connector Connector Connector Resistor Potentiometer Control unit Electronic unit Ground terminal Ground terminal Ground terminal Circuit 49 78 4. 138. 301. 27. Sweden 1060t24b. 213. O 1. W8. 278 106 5 53 84 61 95 For CAN and diagnosis Trailer socket for ABS Service brake valve EBS Trailer sensing 74 © Scania CV AB 1999.mkr 115 221 T40 T90 T87 T89 . W15. 14. location C56 D34 R1 G11 C6 C8 C93 C94 C95 G13 E43 T28 P2 E46 G 4 G18 S50. 328 163.Electrical system EBS 2. 38 106 120. 33.2 Electrical components. 238. 178. S90 W3. O 4 T42 T52 T46 T30 C92 T51 V83 T12 D39 T88 T11 T39 V82 V48 T14 V96 V95 T13 T41 Electrical components in EBS Component No. 126. W18. 2 Component No. 251. 219. 309 144. 334 156. 260 185.mkr © Scania CV AB 1999. 244. 248 151. 303 138.Electrical system EBS 2. 346 161. 223 311 336 317 342 121 126. 236 173. 206. rear Axle 3 LH Axle 3 RH Axle 4 LH Axle 4 RH Axle 4 LH Axle 4 RH Axles 1 and 4 LH Axles 1 and 4 RH Tag axle Axles 2 and 3 Axle 3 TC ABS/truck ABS/trailer Brake pad wear Circuit 96 80 65 61 131. 321 148. O1 R1 S50 S90 T11 T12 T13 T14 T28 T30 T39 T40 T41 T42 T46 T51 T52 T87 T88 T89 T90 V48 V82 V83 V86 V95 V96 W3 W8 W15 W18 Component description Instrument cluster Flasher relay Switch Switch Wheel sensor Wheel sensor Wheel sensor Wheel sensor Wheel sensor Wheel sensor Wear sensor Wear sensor Wear sensor Wear sensor Pressure sensor Wear sensor Wear sensor Wheel sensor Wheel sensor Wear sensor Wear sensor Trailer control module Control module Control module Control module Control module Control module Warning lamp Warning lamp Warning lamp Warning lamp Diagnosis TC Off Axle 1 LH Axle 1 RH Axle 2 LH Axle 2 RH Axle 3 LH Axle 3 RH Axle 1 LH Axle 1 RH Axle 2 LH Axle 2 RH Air suspension. 226 196. 230. 276 201 98 98 97 77 1060t24b. 328 178 151. 211 192. Sweden 75 . 258 169. 283 183. 226. 285 136. 2 Wiring diagrams Circuit paths.25 76 © Scania CV AB 1999. EBS 2.2 Circuit paths 1 .mkr . EBS 2. Sweden 1060t24b.Circuit paths. 75 1060t24b.Circuit paths.2 Circuit paths 26 .50 Circuit paths 51 . EBS 2.mkr © Scania CV AB 1999. Sweden 77 . 125 78 © Scania CV AB 1999. Sweden 1060t24b.2 Circuit paths 76 .100 Circuit paths 101 .Circuit paths.mkr . EBS 2. EBS 2.mkr © Scania CV AB 1999.175 1060t24b.150 Circuit paths 151 .2 Circuit paths 126 .Circuit paths. Sweden 79 . 200 Circuit paths 201 .Circuit paths. EBS 2.225 80 © Scania CV AB 1999. Sweden 1060t24b.2 Circuit paths 176 .mkr . EBS 2.mkr © Scania CV AB 1999.Circuit paths. Sweden 81 .276 1060t24b.250 Circuit paths 251 .2 Circuit paths 226 . 2 Circuit paths 276 .mkr . Sweden 1060t24b. EBS 2.325 82 © Scania CV AB 1999.300 Circuit paths 301 .Circuit paths. Sweden 83 .Circuit paths.2 Circuit paths 326 .350 1060t24b.mkr © Scania CV AB 1999. EBS 2.
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