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 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
C0246, C0251, C0252, C0253 and 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. |
C0247 and 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 |
