Test D: Warning Indicator On With Engine Running, System Is Charging

Check The Fault Codes In The PCM

Connect New Generation Star (NGS) tester to Data Link Connector (DLC). Turn ignition switch to RUN position. Using NGS tester, perform Powertrain Control Module (PCM) self-test. If no DTCs exist, go to next step. If any DTCs exist, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS in ENGINE PERFORMANCE.

Check The System For Overcharging

Start engine. With the engine running and all accessories off, measure the voltage at the battery terminals while varying the engine RPM. Is the voltage greater than 15.5 volts? If yes, go to TEST C: SYSTEM OVERCHARGES . If no, go to next step.

Check The Charging System Warning Indicator Operation

With the engine running, monitor the generator output fault PID in the PCM. Does the PID read YES? If yes, go to next step. If no, see appropriate ANALOG INSTRUMENT PANELS article under ACCESSORIES & EQUIPMENT.

Check The Generator Output

Verify the generator output. See GENERATOR LOAD TEST and GENERATOR NO-LOAD TEST under ON-VEHICLE TESTING. Did the generator pass the on-vehicle tests? If yes, go to next step. If no, install a new generator. See GENERATOR under REMOVAL & INSTALLATION. Clear the DTCs. Test the system for normal operation.

Check For Correct PCM Operation

Check for corrosion and pushed-out pins. Connect any disconnected connectors. Make sure all other system connectors are fully seated. Operate the system and verify the concern is still present. Is the concern still present? If yes, install a new PCM. See COMPUTERIZED ENGINE CONTROLS in appropriate REMOVAL & INSTALLATION in ENGINE PERFORMANCE. Repeat the PCM self-test. If no, the system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. Clear the DTCs. Repeat the self-test.