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 EBCM 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 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 DTC(s) 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 malfunction.
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.
Step | Action | Value(s) | Yes | No | ||||
|---|---|---|---|---|---|---|---|---|
|
Important: Zero the J 39200 test leads before making any resistance measurements. Refer to the J 39200 user's manual. | ||||||||
1 | Was the Diagnostic System Check performed? | -- | Go to Diagnostic System Check | |||||
2 |
Is the resistance within the specified range? | 2.5-5.0 ohms | ||||||
3 |
Do not start the engine. Is the voltage within the specified range? | 0-1 V | ||||||
4 |
Is there damage that may cause a short to voltage? | -- | ||||||
5 |
Does DTC C1277 set as a current DTC? | -- | ||||||
6 | Replace the left front brake solenoid valve. Refer to Brake Solenoid Valve Replacement . Is the repair complete? | -- | Go to Diagnostic System Check | -- | ||||
7 | Repair the short to voltage in CKT 1288. Is the repair complete? | -- | Go to Diagnostic System Check | -- | ||||
8 | Repair the damage that caused a short to voltage. Is the repair complete? | -- | Go to Diagnostic System Check | -- | ||||
9 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Is the repair complete? | -- | Go to Diagnostic System Check | -- | ||||
10 | The malfunction is intermittent or is not present at this time. Refer to Diagnostic Aids for more information. Is the action complete? | -- | System OK | -- | ||||
