C1276

CIRCUIT DESCRIPTION
This Diagnostic Trouble Code (DTC) identifies a solenoid that cannot be energized due to an open in its circuitry, or a solenoid that is always energized due to a short to ground in its circuitry between the Electronic Brake Control Module (EBCM) and the solenoid.
An open will not allow proper ABS operation, but the short to ground simply turns ON the solenoid. A path for base brakes is still allowed once the motor rehomes and the check valve is lifted off its seat when the ignition switch is turned to ON.

CONDITIONS FOR SETTING THE DTC
Diagnostic Trouble Code (DTC) C1276 can set only when the brake solenoid valve is commanded off while the Electronic Brake Control Relay is enabled.
A malfunction exists if the Electronic Brake Control Module (EBCM) detects the left front brake solenoid valve control circuit voltage is not within specifications.

ACTION TAKEN WHEN THE DTC SETS
^ A malfunction Diagnostic Trouble Code (DTC) stores.
^ The ABS disables.
^ The ABS warning indicator turns ON.

CONDITIONS FOR CLEARING THE DTC
^ The condition responsible for setting the Diagnostic Trouble Code (DTC) no longer exists and the Scan Too[ 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
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.
Thoroughly inspect any circuitry that may cause the intermittent complaint for the following conditions:
^ Backed out terminals
^ Improper mating
^ Broken locks
^ Improperly formed or damaged terminals
^ Poor terminal-to-wiring connections
^ Physical damage to the wiring harness

TEST DESCRIPTION
2. This test checks for a short to ground in the left front solenoid valve circuit.
3. This test checks for an open in the control circuit of the solenoid.
4. This test checks for a short to ground in the control circuit of the solenoid.
5. This test checks for an open in the battery feed circuit to the solenoid.
6. This test checks for an open in the left front solenoid valve.
7. This test determines if the malfunction is caused by the Electronic Brake Control Module (EBCM).

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DTC C1276 LF SOLENOID CIRCUIT OPEN OR SHORT TO GROUND