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Test C: The Anti-Lock Brake System (ABS) Module Does Not Respond to The Diagnostic Tool

PINPOINT TEST C: THE ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DOES NOT RESPOND TO THE DIAGNOSTIC TOOL


C1-C2:






Normal Operation
The ABS module communicates with the diagnostic tool through the high speed CAN communications network, circuits 1908 (WH) and 1909 (BK). If one of the bus wires becomes shorted to ground or voltage, communication can continue at a reduced level. Check circuits 1908 (WH) and 1909 (BK) between the ABS module C155 and the data link connector (DLC) C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms there is an open in one of the high speed CAN circuits, damage to the DLC C251, damage to the ABS module C155, or a problem in an in-line connector.

Possible Causes
- high speed CAN circuits 1908 (WH) and 1909 (BK) open
- DLC C251
- C155
- ABS module
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