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
DTC C1237 can only be set if the vehicle's speed is greater than 8 km/h (5 mph). If the battery voltage is greater than 17 volts, a malfunction exists.
Action Taken When the DTC Sets
A malfunction DTC is stored, ABS/TCS is disabled and the ABS and Traction Control Indicators are turned ON.
Conditions for Clearing the DTC
| • | Condition for DTC is no longer present and scan tool clear DTC function is used. |
| • | Fifty ignition cycles have passed with no DTC(s) detected. |
Diagnostic Aids
| • | If an intermittent malfunction exists refer to General Electrical Diagnosis in Wiring Systems. |
| • | Possible causes for DTC C1237 to set: |
| - | Overcharging |
| - | EBTCM malfunction |
Test Description
The numbers below refer to step numbers on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Diagnostic System Check performed? | -- | Go to Diagnostic System Check | |
Is the voltage within the range specified in the Value(s) column? | Less than 17 V | |||
Check actual battery voltage, using J 39200 DMM, while running engine at approximately 2000 RPM. Is the voltage within the range specified in the Value(s) column? | Less than 17V | Refer to Starter and Charging System Check in Engine Electrical. | ||
4 | Carefully test drive vehicle above 8 km/h (5 mph). Does DTC C1237 reset as a current DTC? | -- | Go to Diagnostic System Check | |
5 | Replace the EBTCM. Refer to Electronic Brake and Traction Control Module . Is repair complete? | -- | Go to Diagnostic System Check | -- |
