For 1990-2009 cars only
Circuit Description
This DTC identifies a malfunction within the EBCM/EBTCM.
Conditions for Setting the DTC
An internal EBCM/EBTCM malfunction exists.
Action Taken When the DTC Sets
| • | A DTC C1255xx is stored. |
| • | Depending on the sub code, the ABS/TCS and/or the variable effort steering is disabled. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present and you used the scan tool Clear DTC function. |
| • | The EBCM/EBTCM does not detect the DTC in 50 drive cycles. |
Diagnostic Aids
| • | Two more numbers will follow the DTC C1255xx on the scan tool. Remember these numbers along with any other DTCs that may be displayed. These 2 numbers help engineering to determine the cause of the internal malfunction. |
| • | A DTC C1255e2 can be caused by a battery or module connector disconnect. Inspect for a recent battery disconnect or module connector disconnect before replacing the EBCM/EBTCM. |
| • | A DTC C1255m5 can be set along with any wheel speed sensor DTC. Diagnose any wheel speed sensor DTCs before replacing the EBCM/EBTCM. |
| • | Verify that the EBCM/EBTCM to BPMV connection meets the following conditions: |
| - | The connection is secure. |
| - | The connection is tight. |
| - | The connection is free from corrosion. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the ABS Diagnostic System Check performed? | -- | Go to Step 2 | |
2 | Are there any other DTCs present besides C1255xx? | -- | Go to Step 3 | |
Was any damage found? | -- | Go to Step 4 | Go to Step 5 | |
4 | Repair as needed. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
5 | Replace the EBCM/EBTCM. Refer to Electronic Brake Control Module Replacement . Is the repair complete? | -- | -- |
