Circuit Description
The electronic brake control relay supplies power to the solenoid valves and pump motor. The relay activates when the ignition is turned ON. Power is available to the solenoid valves and pump motor through the relay via the battery positive voltage circuit. The relay remains engaged until you turn OFF the ignition or a DTC which disables the ABS is set.
Conditions for Running the DTC
| • | The ignition voltage is greater than 10.5 volts. |
| • | The system relay is commanded ON. |
Conditions for Setting the DTC
DTC C1214 will set anytime the solenoid valve relay is commanded ON and the relay voltage is less than 8 volts, and ignition voltage is greater than 10.5 volts.
Action Taken When the DTC Sets
| • | ABS is disabled. |
| • | The ABS warning indicator turns 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. |
| • | 100 drive cycles pass with no DTC(s) detected. A drive cycle consists of starting the vehicle, driving the vehicle over 16 km/h (10 mph), stopping and then turning the ignition OFF. |
Diagnostic Aids
Possible Causes:
| • | Weak or discharged battery |
| • | Loose or corroded battery terminals |
| • | Loose or corroded engine grounds |
| • | Poor terminal contact at the EBCM |
It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing a part replacement with a reappearance of the malfunction.
If an intermittent malfunction exists refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
The relay is integral to the EBCM and is not serviceable separately.
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics | ||||
1 | Did you perform A Diagnostic System Check - ABS? | -- | Go to Step 2 | |
Does the DTC reset as a current DTC? | -- | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | |
3 |
Does the DMM display the specified value? | OL | Go to Step 5 | Go to Step 4 |
4 | Replace the EBCM and the BPMV. Refer to Electronic Brake Control Module Replacement and Brake Pressure Modulator Valve Replacement . Did you complete the replacement? | -- | Go to Step 6 | -- |
5 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Did you complete the replacement? | -- | Go to Step 6 | -- |
6 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
