Test Procedure
- HY1 CHECK THE GENERATOR CIRCUITRY AND OPERATION NOTE: If the concern is still present after checking the generator circuitry in the appropriate article, return to the INTRODUCTION GASOLINE ENGINES--> to continue generator diagnosis.
- Check the generator circuitry and operation. Refer to the appropriate CHARGING SYSTEM - GENERAL INFORMATION article. Follow the diagnostics for the symptoms or DTCs as directed.
- Is the charging system diagnosed and repaired in the appropriate CHARGING SYSTEM - GENERAL INFORMATION article?
Yes No The system is operating correctly at this time. GO to HY2. - HY2 CHECK THE GENERATOR MONITOR SIGNAL
- Key ON, engine running.
- Access the PCM and monitor the GENMN GFS PID.
- Is the duty cycle between 5% and 97% and not excessively fluctuating?
Yes No The system is operating correctly at this time. GO to HY3. - HY3 CHECK FOR CORRECT PCM OPERATION NOTE: When the battery (or PCM) is disconnected and connected, some abnormal drive symptoms may occur while the vehicle relearns its adaptive strategy. The charging system set point may also vary. The vehicle may need to be driven to relearn its strategy.
- Disconnect all the PCM connectors.
- Visually inspect for:
- pushed out pins
- corrosion
- Connect all the PCM connectors and make sure they seat correctly.
- Carry out the PCM self-test and verify the concern is still present.
- Is the concern still present?
Yes No INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.