How to diagnose the ABS system

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The following was taken from a posting by Alex Perry on V6SHO on Sun May 6, 2007:

I apologise since I can't credit the original source for this info, I had it stored in my Google Notebook.

     ............../----------- \
     ........./........[.]...[G].....\
     ..../...............................\
     /.....[.].........[.]...[T]....[.]..|   

ABS Data Link Connctor (C170) viewed from pin face:

     L = Warning lamp to dash
     G = Ground
     T = Trigger

To pull codes, use a paperclip to jumper the ground and trigger pins together. Turn ignition key to RUN without starting engine. Count ABS light flashes to get two-digit code. Each code takes about 15 seconds if there are mulitple codes.

ABS Error codes:

  • 11 (ABS Module)
  • 17 (Reference Voltage Problem)
  • 22 (LH Front Inlet Valve)
  • 23 (LH Front Outlet Valve)
  • 24 (RH Front Inlet Valve)
  • 25 (RH Front Outlet Valve)
  • 26 (RH Rear Inlet Valve)
  • 27 (RH Rear Outlet Valve)
  • 28 (LH Rear Inlet Valve)
  • 29 (LH Rear Outlet Valve)
  • 31 (LH Front Sensor)
  • 32 (RH Front Sensor)
  • 33 (RH Rear Sensor)
  • 34 (LH Rear Sensor)
  • 35 (LH Front Sensor)
  • 36 (RH Front Sensor)
  • 37 (RH Rear Sensor)
  • 38 (LH Rear Sensor)
  • 41 (LH Front Sensor)
  • 42 (RH Front Sensor)
  • 43 (RH Rear Sensor)
  • 44 (LH Rear Sensor)
  • 51 (LH Front Outlet Valve)
  • 52 (RH Front Outlet Valve)
  • 53 (RH Rear Outlet Valve)
  • 54 (LH Rear Outlet Valve)
  • 55 (LH Front Sensor)
  • 56 (RH Front Sensor)
  • 57 (RH Rear Sensor)
  • 58 (LH Rear Sensor)
  • 61 (FLS Circuits)
  • 62 (Travel Switch)
  • 63 (Pump Motor Speed Sensor)
  • 64 (Pump Motor Pressure)
  • 71 (LH Front Sensor)
  • 72 (RH Front Sensor)
  • 73 (RH Rear Sensor)
  • 74 (LH Rear Sensor)
  • 75 (LH Front Sensor)
  • 76 (RH Front Sensor)
  • 77 (RH Rear Sensor)
  • 78 (LH Rear Sensor)

Each code has it's own diagnostic procedure to isolate the exact fault. In other words, just because the code says, for example, "RH Front Sensor" does not mean that the fault can only be the sensor as it could also be the wiring harness or the ABS computer or a connector problem.

If there are multiple codes, there a a specified hierarchy by which they must be addressed to prevent unneeded repairs or diagnostics.

end quotatioon