Circuit Description
The powertrain control module (PCM) monitors the system voltage on the ignition feed terminals to the PCM. A system voltage DTC will set whenever the voltage is above a calibrated value.
Conditions for Setting
The system voltage is less than 17 volts.
Action Taken
The PCM outputs will be disabled.
Conditions for Clearing the MIL/DTC
| • | A history DTC will clear after 40 consecutive ignition cycles have occurred without a fault. |
| • | History and current DTC can be cleared by using a scan tool. |
Diagnostic Aids
Charging the battery with a battery charger and starting the engine may set a DTC. If the DTC sets when an accessory is operated, check for a poor connection or excessive current draw.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics | ||||
1 | Was the On-Board Diagnostic (OBD) System Check performed? | -- | Go to Step 2 | |
2 |
Is the ignition volts less than the specified value? | 2,000 RPM 17 V | Go to Diagnostic Aids | Go to Step 3 |
3 | Using a DVM, measure the battery voltage at the battery while running the engine above 2,000 RPM. Is the battery voltage less than the specified value? | 17 V | Go to Step 4 | Go to Starting/Charging |
4 | Replace the PCM. Is the action complete? | -- | -- | |
