Circuit Description
Apply and release coils are an integral part of the electronic brake control module (EBCM). The coils are supplied with battery power when the ignition is in the ON position and the solenoid relay is closed. The EBCM controls the solenoids by grounding the respective coil circuit when necessary.
Conditions for Setting the DTC
When the EBCM senses are open, short to ground or a short to power on any one of the apply or release coils, the respective DTC will set.
Action Taken When the DTC Sets
| • | The solenoid relay opens, removing power from the pump motor and solenoids. |
| • | The respective DTC is stored. |
| • | ABS disabled, ABS warning lamp turns ON. |
Conditions for Clearing the DTC
| • | If the conditions that set DTC C0066 are no longer present, the DTC may be cleared by using the proper scan tool. |
| • | The DTC that has not occurred in 100 drive cycles will be cleared from the history data. |
Diagnostic Aids
Ensure the integrity of the connection between the EBCM and the brake pressure modulator valve (BPMV) is secure, tight, and free from corrosion.
Since the solenoid coils are an integral part of the EBCM, any one of the DTCs settings will usually indicate an internal fault to the EBCM.
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Diagnostic System Check - ABS? | Go to Step 2 | |
2 |
Is any physical damage noted? | Go to Step 3 | Go to Step 4 |
3 | Replace the damaged components. Did you complete the replacement? | System OK | -- |
4 |
Was the cavity free from any fluid leaks, damage, or corrosion? | Go to Step 5 | Go to Step 6 |
5 | Replace both the EBCM and the BPMV. Refer to Brake Pressure Modulator Valve Assembly Replacement . Did you complete the replacement? | System OK | -- |
6 |
Does the DTC reset as current DTC? | Go to Step 5 | Go to Step 2 |
