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) and the battery voltage is more than 17.0 volts
Action Taken When the DTC Sets
| • | A DTC C1237 is stored |
| • | The ABS/TCS is disabled |
| • | The ABS and TRACTION OFF indicators are turned on |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present and the scan tool clear DTC function is used |
| • | 50 ignition cycles have passed with no DTCs detected |
Diagnostic Aids
| • | Inspect the battery for overcharging |
| • | 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 Diagnostic System Check performed? | -- | Go to Diagnostic System Check | |
Is the voltage less than the specified value? | 17.0 V | |||
Using the J 39200 DMM, check 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 Charging System Check in Engine Electrical | ||
4 | Test drive the vehicle above 8 km/h (5 mph). Does DTC C1237 reset? | -- | Go to Diagnostic System Check | |
5 | Replace the EBCM/EBTCM. Refer to Electronic Brake Control Module Replacement . Is the replacement complete? | -- | Go to Diagnostic System Check | -- |
