C1277

Circuit Description
Diagnostic Trouble Code (DTC) C1277 identifies a solenoid that cannot be energized due to a short to ground in the solenoid circuitry. The malfunction can affect Antilock Brake System (ABS) operation since the flow of brake fluid to the wheel cylinder cannot be stopped. The unstoppable flow of brake fluid to the wheel cylinder makes ABS operation for that channel impossible.

Conditions for Setting the DTC
- This DTC will set when the following conditions are met:
- The Electronic Brake Control Module (EBCM) identifies a situation in which the left front solenoid cannot be turned ON due to a short to ground in Circuit (CKT) 9101.
- This DTC can be set only when the left front solenoid is turned ON.

Action Taken When the DTC Sets
- A malfunction DTC stores.
- The ABS disables.
- The ABS warning indicator turns ON.

Conditions for Clearing the DTC
- The condition responsible for setting the DTC no longer exists and the Scan Tool Clear DTCs function is used.
- 100 drive cycles pass with no DTCs detected. A drive cycle consists of starting the vehicle, driving the vehicle over 16 km/h (10 mph), stopping and then turning the ignition off.

Diagnostic Aids
Use the enhanced diagnostic function of the Scan Tool in order to measure the frequency of the malt unction.
Any circuitry that is suspected of causing the intermittent complaint should be thoroughly checked for improper mating, improperly formed or damaged terminals, poor terminal to wiring connections, or physical damage to the wiring harness.

IMPORTANT: Zero the J 39200 test leads before making any resistance measurements. Refer to the J 39200 user's manual.