Circuit Description
This DTC identifies a malfunction within the EBCM. When the EBCM relay is activated (turned on), voltage is supplied to the valve solenoids and pump motor.
Conditions for Running the DTC
The ABS/TCS conditions are normal.
Conditions for Setting the DTC
DTC C1256 is set when an internal EBCM malfunction exists.
Action Taken When the DTC Sets
| • | The ABS remains functional. |
| • | The ABS indicator remains OFF. |
Conditions for Clearing the DTC
| • | Condition for DTC is no longer present and scan tool clear DTC function is used. |
| • | 100 ignition cycles have passed with no DTCs detected. |
Diagnostic Aids
Possible cause for DTC C1256 to set is an internal relay problem within the EBCM.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the ABS Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Does the scan tool display other ABS/TCS DTCs? | -- | Go to Step 3 | |
3 | Inspect for poor connections/terminal tension at the EBCM harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 5 | Go to Step 4 |
4 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement Did you complete the repair? | -- | Go to Step 5 | -- |
5 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
