Truck, Tractor and Bus ABS Blink Code …

1 truck , Tractor and Bus ABS Blink code diagnostics , All C-Version ECUsIncludes Additional 6S/6M and 6S/4M Blink CodesIntroductionThe Meritor WABCO Electronic Control Unit (ECU) uses a pattern of light flashes called a Blink code to identify specific problems, or faults, in the ABS. The warning lamp flashes a Blink code for each fault that the ECU stores in its memory, enabling a technician to repair faults and erase them from ECU memory. For additional service information, Maintenance Manual 28, Anti-Lock Braking Systems (ABS) for Trucks, tractors and Buses is available in electronic format on the Meritor WABCO website ( ).

2 Fault CodeCauseSolutionBlink CodeLocation1-0-0 2-0-04-0-0N/ANo Faults. System action 2-6-64-6-6 Voltage Relay 1 Low voltage to the diagonal relay or defective vehicle voltage. Replace relay if 2-6-74-6-7 Voltage Relay 21-6-82-6-84-6-8 Right Front WheelErratic wheel speed signal from the steering for loose wheel bearings, faulty sensor wiring connections, excessive hub runout, a sensor gap that is too wide or damage to tooth wheels on the steering 2-6-94-6-9 Left Front Wheel1-6-102-6-104-6-10 Right Front WheelSensor circuit failure on steering sensor.

3 Sensor cable and cable Front Wheel1-6-122-6-124-6-12 Right Front WheelSteering axle sensor out of sensors on steering 4-6-13 Left Front Wheel1-7-0 2-7-04-7-0 Left Rear WheelErratic wheel speed from drive for loose wheel bearings, faulty sensor wiring connections, excessive hub runout, sensor gap that is too wide or damage to tooth wheels on the drive Rear Wheel1-7-22-7-2 4-7-2 Left Rear WheelSensor circuit failure on drive sensor, sensor cable and cable Rear Wheel1-7-42-7-44-7-4 Left Rear WheelDrive axle sensor out of sensors on drive axle.

4 Check for differences between steer and drive tire Rear WheelThe first digit of the Blink code identifies the system configuration: 1 = 6S/6M, 2 = 4S/4M, 4 = 6S/4M. The last two digits identify the = 6S/6M2 = 4S/4M4 = 6 Page 1 Wednesday, June 18, 2008 10:44 AM1-8-3 2-8-34-8-3N/AImproperly wired J1922 Engine Data Link. Short circuit to power or ground, or open J1922 Engine Data Link, cable and wired J1922 Engine Data Link. Short circuit to power or ground, open circuit, wires 2-8-74-8-7N/AMessage error detected in J1922 Engine Data fault from ECU memory.

5 No other action 2-8-94-8-9N/A1-8-10 2-8-104-8-10 Right Front WheelShort circuit in steering axle ABS valve to ground ABS valve and cable. Replace as 2-8-114-8-11 Left Front Wheel1-8-12 2-8-124-8-12 Right Front WheelOpen circuit in steering axle ABS valve or 2-8-134-8-13 Left Front Wheel1-8-14 2-8-144-8-14 Right Front WheelShort circuit in steering axle ABS valve to ground ABS valve and cable. Replace as 2-8-154-8-15 Left Front Wheel1-9-02-9-04-9-0 Right Front WheelOpen circuit in steering axle ABS valve or 2-9-14-9-1 Left Front Wheel1-9-2 2-9-24-9-2 Left Rear WheelShort circuit to ground in drive axle ABS valve or 2-9-3 4-9-3 Right Rear Wheel1-9-4 2-9-44-9-4 Left Rear WheelOpen circuit in drive axle ABS valve or 2-9-54-9-5 Right Rear Wheel1-9-6 2-9-64-9-6 Left Rear WheelShort circuit to ground in drive axle ABS valve or 2-9-74-9-7 Right Rear Wheel1-9-8 2-9-84-9-8 Left Rear

6 WheelOpen circuit in drive axle ABS valve or 2-9-94-9-9 Right Rear WheelFault CodeCauseSolutionBlink CodeLocationThe first digit of the Blink code identifies the system configuration: 1 = 6S/6M, 2 = 4S/4M, 4 = 6S/4M. The last two digits identify the Page 2 Wednesday, June 18, 2008 10:44 AM1-10-2 2-10-24-10-2 Left Rear WheelShort circuit in ATC valve to ground ATC valve and cable. Replace as 2-10-34-10-3 Right Rear Wheel1-10-4 2-10-44-10-4 Left Rear WheelOpen circuit in ATC valve or ATC valve and cable.

7 Replace as 2-10-54-10-5 Right Rear Wheel1-10-7 2-10-74-10-7N/AShort circuit in wiring or relay that controls engine engine brake relay and wiring to relay 2-10-84-10-8 Left Rear WheelExcessive drive axle wheel spin caused by driver or steer axle sensor gap. Erase fault from ECU 2-10-94-10-9 Right Rear Wheel1-11-12 2-11-124-11-12 Right Front WheelShort circuit between steering axle ABS valve and power supply ABS valve and cable. Replace as 2-11-134-11-13 Left Front Wheel1-11-142-11-144-11-14 Left Rear WheelShort circuit between drive axle ABS valve and power supply 2-11-154-11-15 Right Rear Wheel1-12-2 2-12-24-12-2 Left Rear WheelShort circuit between ATC valve and power supply ATC valve and cable.

8 Replace as 2-12-34-12-3 Right Rear Wheel1-12-42-12-44-12-4N/AShort circuit between pin 12 of ABS ECU and power supply ECU 2-12-74-12-7N/AShort circuit between engine brake and ground engine brake 2-12-84-12-8 Right Front WheelShort circuit between steering axle ABS valve and ABS valve and cable. Replace as 2-12-94-12-9 Left Front Wheel1-12-10 2-12-104-12-10 Left Rear Wheel1-12-11 2-12-114-12-11 Right Rear Wheel1-12-14 2-12-144-12-14 Left Rear WheelShort circuit between steering axle ATC valve and ATC valve and cable.

9 Replace as CodeCauseSolutionBlink CodeLocationThe first digit of the Blink code identifies the system configuration: 1 = 6S/6M, 2 = 4S/4M, 4 = 6S/4M. The last two digits identify the Page 3 Wednesday, June 18, 2008 10:44 AMInformation contained in this publication was in effect at the time the publication was approved for printing and is subject to change without notice or liability. Meritor WABCO reserves the right to revise the information presented or to discontinue the production of parts described at any 2005 TP-94157 ArvinMeritor, 12-05 All Rights ReservedPrinted in USA(16579/22882)Meritor WABCO Vehicle Control Systems2135 West Maple RoadTroy, MI 48084-7121 6S/6M or 6S/4M Blink Codes1 = 6S/6M4 = 6S/4M1-12-15 2-12-154-12-15 Right Rear WheelShort circuit between steering axle ATC valve and ATC valve and cable.

10 Replace as circuit between pin 12 of ABS ECU and ECU Relay 1 Diagonal valve relay not operating diagonal valve Relay 21-13-8 2-13-84-13-8 Voltage Relay 1 Too high power supply vehicle power 2-13-9 4-13-9 Voltage Relay 2 Fault CodeCauseSolutionBlink code Axle 3 LeftRight1-7-84-7-81-7-94-7-9 Erratic wheel speed from third for loose wheel bearings, faulty sensor wiring connections, excessive hub runout, sensor gap that is too wide or damage to tooth wheels on third circuit failure on third sensor, sensor cable and cable axle sensor out of sensors on third axle.