Circuit Description
When the electronic brake control module (EBCM) grounds the pump motor relay, it closes and provides battery voltage to the pump motor if the valve relay is closed. The EBCM senses the voltage applied to the pump motor to verify motor operation.
This DTC sets when the EBCM detects B+ without motor relay activation or if the EBCM does not detect B+ after motor relay activation.
Conditions for Setting the DTC
| • | There is a faulty terminal in the pump motor connector. |
| • | There is a faulty terminal in the EBCM connector. |
| • | There is a problem in the antilock brake system (ABS) wiring harness. |
| • | There is high resistance in the chassis ground. |
| • | The EBCM is defective. |
| • | There is a problem in the wiring from the pump motor connector to the motor. |
Action Taken When the DTC Sets
The antilock brake system (ABS) is disabled, and the ABS warning lamp is ON. The electronic brake force distribution (EBD) is disabled.
Diagnostic Aids
It is very important to perform a thorough inspection of the wiring and the connectors. Failure to do so may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step checks for connector damage.
-
This step checks for a poor ground connection.
-
This step checks for a possible problem with the motor connector at the ABS unit.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Is the terminal damaged or corroded? | -- | Go to Step 2 | Go to Step 3 | |
2 | Repair or replace the terminal, the connector, the wiring harness, or the EBCM as required. Did you complete the action? | -- | System OK | -- |
Measure the resistance from terminal 16 of the harness connector to a good chassis ground. Is the resistance equal to the specified value? | 0 ohms | Go to Step 7 | Go to Step 4 | |
4 | Measure the resistance at the chassis ground connection G106. Is the resistance equal to the specified value? | 0 ohms | Go to Step 6 | Go to Step 5 |
5 | Repair the connection at chassis ground G106. Did you complete the repair? | -- | System OK | -- |
6 | Repair the open or the high resistance in the harness between terminal 16 of connector J1 and the ground lug, or replace the antilock brake system (ABS) wiring harness. Did you complete the action? | -- | System OK | -- |
Is there any sign of damage or corrosion that would prevent a good ground contact? | -- | Go to Step 8 | Go to Step 9 | |
8 | Repair or replace the defective terminal, connector, or ABS unit as required. Did you complete the action? | -- | System OK | -- |
9 | Replace the ABS unit. Did you complete the replacement? | -- | System OK | -- |
