Circuit Description
This circuit is designed to detect high vehicle voltage levels to the solenoid relay. High voltage may cause damage to the system.
Conditions for Setting the DTC
| • | The vehicle speed is greater than 8 km/h (5 mph). |
| • | The battery voltage is more than 17.0 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 tests to see what the EBCM/EBTCM is reading as the voltage.
-
This step tests 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 less than the specified value? | 17.0 V | Go to Step 5 | Go to Step 3 | |
Using the J 39200 digital multimeter (DMM), measure the actual battery voltage while running the engine at about 2000 rpm. Is the voltage less than 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 . Is the repair complete? | -- | -- |
