Circuit Description
The circuit detects high vehicle voltage levels to the solenoid relay. High voltage may cause damage to the system.
Conditions for Setting the DTC
All of the following conditions occur:
| • | The vehicle speed is greater than 8 km/h (5 mph). |
| • | The battery positive voltage (B+) is greater than 17 volts. |
Action Taken When the DTC Sets
| • | A malfunction DTC is stored. |
| • | The ABS/TCS is disabled. |
| • | The ABS indicator isturned ON. |
| • | The TRACTION OFF indicator is turned ON. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present and you used the scan tool Clear DTC function. |
| • | The EBCM/EBTCM does not detect the DTC in 50 drive cycles. |
Diagnostic Aids
| • | Inspect the battery for overcharging. |
| • | 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 part replacement with reappearance of the malfunction. |
| • | An intermittent malfunction can be caused by poor connections, broken insulation, or a wire that is broken inside the insulation. |
| • | If an intermittent malfunction exists, refer to Intermittents and Poor Connections Diagnosis in Wiring Systems. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step checks to see what the EBCM/EBTCM is reading as the voltage.
-
This step checks the actual battery voltage.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the ABS Diagnostic System Check performed? | -- | Go to Step 2 | |
Is the voltage below the specified value? | 17.0 V | Go to Step 5 | Go to Step 3 | |
Use the J 39200 DMM in order to inspect the actual battery voltage while running the engine at about 2000 rpm. Is the voltage below the specified value? | 17.0 V | Go to Step 4 | Go to Charging System Check in Engine Electrical | |
4 | Test drive the vehicle above 8 km/h (5 mph). Does DTC C1237 reset? | -- | Go to Step 5 | |
5 | Replace the EBCM/EBTCM. Refer to Electronic Brake Control Module Replacement . Did you complete the repair? | -- | -- |
