Circuit Description
DTC C1237 detects high vehicle voltage levels prior to any required motor movement (initialization or ABS. If excessive voltage exists, demagnetization of the motor magnets may occur. Demagnetization of the motor magnets would eventually affect or eliminate ABS/TCS performance.
Conditions for Setting the DTC
DTC C1237 can set only if the vehicle's speed is greater than 5 km/h (3 mph).
A malfunction exists if the switched battery voltage is greater than 17.1 volts.
Action Taken When the DTC Sets
| • | A malfunction DTC stores. |
| • | The ABS disables. |
| • | The amber ABS warning indicator(s) turn 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. |
Diagnostic Aids
The following conditions may cause an intermittent malfunction:
| • | A poor connection |
| • | Rubbed-through wire insulation |
| • | A broken wire inside the insulation |
Use the enhanced diagnostic function of the Scan Tool in order to measure the frequency of the malfunction. Refer to the Scan Tool manual for the procedure.
Thoroughly inspect any circuitry that may be causing the intermittent complaint for the following conditions:
| • | Backed out terminals |
| • | Improper mating |
| • | Broken locks |
| • | Improperly formed or damaged terminals |
| • | Poor terminal-to-wiring connections |
| • | Physical damage to the wiring harness |
Important: Zero the J 39200 test leads before making any resistance measurements. Refer to the J 39200 user's manual.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Diagnostic System Check performed? | -- | Go to Diagnostic System Check | |
2 |
Is the voltage less than or equal to the specified voltage? | 16 V | ||
3 |
Is the voltage less than or equal to the specified range? | 16 V | Refer to Charging System Check in Engine Electrical | |
4 |
Does DTC C1237 set as a current DTC? | -- | ||
5 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Is the repair complete? | -- | Go to Diagnostic System Check | -- |
6 | The malfunction is intermittent or is not present at this time. Is the action complete? | -- | Go to Diagnostic Aids | -- |
