Pinpoint Test F: DTC C1266

Anti-Lock Control

Pinpoint Tests

Pinpoint Test F: DTC C1266

Refer to Wiring Diagram Set 42, Vehicle Dynamic Systems for schematic and connector information. Diagrams By Number

Fused battery voltage is provided to the ABS module from Battery Junction Box (BJB) fuses 109 (20A) and 106 (40A) along circuits 483 (RD) and 601 (LB/PK) respectively. Fused ignition voltage is provided from Central Junction Box (CJB) fuse 20 (10A) along circuit 1789 (VT/WH). When necessary, the ABS module supplies voltage to the Hydraulic Control Unit (HCU) assembly and the pump motor is activated. The ABS module is provided a ground along circuit 57 (BK) and the hydraulic pump motor is provided a ground internally through the HCU.

- DTC C1266 ABS Valve Power Relay Circuit Failure - If the ABS module detects an open circuit or a short to ground in the valve power circuit, DTC C1266 will be set.

This pinpoint test is intended to diagnose the following:
- Fuses
- Wiring, terminals or connectors
- ABS module



PINPOINT TEST F: DTC C1266

NOTICE: The Flex Probe Kit must be used for all test connections. Use of standard multi-meter probes may damage wiring terminals.

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F1 CHECK THE VOLTAGE TO THE ABS MODULE


- Disconnect: ABS Module C135.
- Measure the voltage between ABS module C135-25, circuit 483 (RD), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module Service and Repair. TEST the system for normal operation.

No
VERIFY BJB fuse 109 (20A) is OK. If OK, REPAIR circuit 483 (RD). If the fuse is not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. CLEAR the DTCs. TEST the system for normal operation.

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