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.
• | The ignition is ON. |
• | The vehicle speed is greater than 6 km/h (4 mph). |
The EBCM detects an internal malfunction.
If equipped, the following actions occur:
• | The EBCM disables the DRP/ABS. |
• | The ABS indicator turns ON. |
• | The red brake warning indicator turns ON. |
If equipped, the following actions occur:
• | The EBCM disables the ABS. |
• | The ABS indicator turns ON. |
The conditions for setting the DTC are no longer present and you use the scan tool Clear DTCs function.
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 ABS Diagnostic System Check? | Go to Step 2 | |
2 |
Does the DTC set? | Go to Step 3 | Go to Diagnostic Aids |
3 |
Important: Following EBCM replacement, use the scan tool to perform the Tire Size Calibration procedure and the Trim Level Calibration procedure, if applicable. Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Did you complete the replacement? | Go to Step 4 | -- |
4 |
Does the DTC reset? | Go to Step 3 | System OK |