Circuit Description
The solenoid valves are part of the brake pressure modulator valve (BPMV). The BPMV turns ON and OFF the solenoid valves as deemed necessary to modulate hydraulic pressure to the wheel brakes.
Conditions for Running the DTC
DTCs 41-56 can be set anytime the ignition switch is in the ON position.
Conditions for Setting the DTC
The electronic brake control module (EBCM) detects one of the following conditions in the solenoid circuitry:
| • | An open or high resistance |
| • | A short to ground |
| • | A short to voltage |
Action Taken When the DTC Sets
| • | The EBCM disables the antilock brake system (ABS) and traction control system for the duration of the ignition cycle. |
| • | The ABS or ABS and TRAC OFF warning indicators turn ON. |
Conditions for Clearing the DTC
The condition responsible for setting the DTC no longer exists and the Scan Tool Clear DTCs function is used.
Diagnostic Aids
Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction.
The following are possible causes of the malfunction:
| • | An open, high resistance, or a short to ground in the battery positive voltage circuits |
| • | An open or high resistance in the solenoid ground circuit |
| • | An internal EBCM malfunction |
If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Test Description
The numbers below refer to step numbers on the diagnostic table.
-
This step determines if the DTC is current.
-
This step tests the EBCM ground circuits.
-
This step tests the EBCM battery positive voltage circuits.
-
This step tests the EBCM ignition positive voltage circuit.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics Connector End View Reference: Antilock Brake System Connector End Views | ||||
1 | Did you perform A Diagnostic System Check - ABS? | -- | Go to Step 2 | |
2 | Is an additional DTC 41-56 also set? | -- | Go to Step 4 | Go to Step 3 |
Does the DTC reset? | -- | Go to Step 10 | Go to Diagnostic Aids | |
4 |
Does the voltage for both circuits measure as specified? | Approximately 12 V | Go to Step 5 | Go to Step 7 |
5 |
Does the voltage measure as specified? | Approximately 12 V | Go to Step 6 | Go to Step 8 |
Test the EBCM ground circuits for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 9 | |
Test the battery positive voltage circuits for an open, high resistance or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 9 | |
Test the ignition positive voltage circuits for an open, high resistance or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 9 | |
9 | Inspect for poor connections at the harness connector of the EBCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 10 |
10 | Replace the Brake Pressure Modulator Valve (BPMV). Refer to Brake Pressure Modulator Valve Replacement . Did you complete the replacement? | -- | Go to Step 11 | -- |
11 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
