Circuit Description
The ABS relay supplies battery voltage to 6 valve solenoids. The electronic brake control module (EBCM) microprocessor applies the grounds needed to activate each solenoid. The low side of each solenoid coil has a feedback circuit to the EBCM microprocessor. When a solenoid is commanded OFF, the feedback voltage is high. When a solenoid is commanded ON, the feedback voltage is low.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
| • | DTC C0241 EBCM Control Valve Circuit |
| • | DTC C0242 EBCM Control Valve Circuit |
| • | DTC C0243 EBCM Control Valve Circuit |
| • | DTC C0244 EBCM Control Valve Circuit |
| • | DTC C0245 EBCM Control Valve Circuit |
| • | DTC C0246 EBCM Control Valve Circuit |
| • | DTC C0247 EBCM Control Valve Circuit |
| • | DTC C0248 EBCM Control Valve Circuit |
| • | DTC C0251 EBCM Control Valve Circuit |
| • | DTC C0252 EBCM Control Valve Circuit |
| • | DTC C0253 EBCM Control Valve Circuit |
| • | DTC C0254 EBCM Control Valve Circuit |
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The vehicle speed is greater than 6 km/h (4 mph). |
Conditions for Setting the DTC
The EBCM detects an internal malfunction.
Action Taken When the DTC Sets
C0241, C0242, C0245, C0246, C0251, C0252, C0253, C0254
If equipped, the following actions occur:
| • | The EBCM disables the DRP/ABS. |
| • | The ABS indicator turns ON. |
| • | The red brake warning indicator turns ON. |
C0243, C0244, C0247, C0248
If equipped, the following actions occur:
| • | The EBCM disables the ABS. |
| • | The ABS indicator turns ON. |
Conditions for Clearing the DTC
The conditions for setting the DTC are no longer present and you use the scan tool Clear DTCs function.
Diagnostic Aids
An intermittent open/shorted solenoid DTC can be set by several different internal EBCM problems. Replace the EBCM if an open/shorted solenoid DTC continues to set intermittently.
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the DTC set? | Go to Step 3 | Go to Diagnostic Aids |
3 | Replace the electronic brake control module (EBCM). Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 4 | -- |
4 |
Does the DTC reset? | Go to Step 3 | System OK |
