C1277

CIRCUIT DESCRIPTION
DTC C1277 identifies a solenoid that cannot be energized due to a short to voltage in the solenoid driver circuitry. The malfunction can affect 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
DTC C1277 can set only when the brake solenoid valve is commanded on.
A malfunction exists if the Electronic Brake Traction Control Module (EBTCM) detects the left front brake solenoid valve control circuit voltage is not within specifications.

ACTION TAKEN WHEN THE DTC SETS
- A malfunction DTC stores.
- The ABS/ETS disables.
- The amber ABS/ETS warning indicators turn 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.

DIAGNOSTIC AIDS
The following conditions may cause an intermittent malfunction:
- A poor connection
- Rubbed-through wire insulation
- A broken wire inside the insulation Use the enhanced diagnostic function of the Scan Tool in order to measure the frequency of the malfunction. Refer to the Scan Tool manual or Scan Tool Diagnosis for the procedure.

Thoroughly inspect any circuitry that may cause the intermittent complaint for the following conditions:
- Backed out terminals
- Improper mating
- Improperly formed or damaged terminals
- Poor terminal-to-wiring connections
- Physical damage to the wiring harness