Circuit Description
The pump motor is contained within the brake pressure modulator valve (BPMV). The pump motor ground is supplied though terminal D of the electronic brake control module (EBCM).
Conditions for Setting the DTC
DTC C0042 can only be set with the key in the ON position, pump motor is OFF, and the EBCM detected high resistance or an open circuit across the motor.
Action Taken When the DTC Sets
| • | The solenoid relay opens, removing power from the pump motor and solenoids. |
| • | DTC C0042 is stored. |
| • | The antilock brake system (ABS) is disabled and the ABS warning lamp illuminates. |
Conditions for Clearing the DTC
| • | If the conditions that set DTC C0042 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 history data. |
Diagnostic Aids
Typical causes of DTC C0042:
| • | BPMV pump motor open or high resistance |
| • | EBCM malfunction |
Step | Action | Values | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check-ABS? | -- | Go to Step 2 | |
2 |
Were the terminals and connector OK, and the cavity free of brake fluid, damage, and corrosion? | -- | Go to Step 4 | Go to Step 3 |
3 |
Did you complete the replacement? | -- | System OK | -- |
4 | Connect an ohmmeter to terminal 1 and terminal 2 of the BPMV. Does the resistance measure less than the specified value? | 2 ohms | Go to Step 6 | Go to Step 5 |
5 | Replace the BPMV. Did you complete the replacement? | -- | System OK | -- |
6 | Replace the EBCM. Did you complete the replacement? | -- | System OK | -- |
