DTC P0622: Generator F-Terminal Circuit

If diagnostic system check was not performed, perform ENGINE ELECTRICAL DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM. If diagnostic system check was performed, go to next step.
Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel. Start engine. Using scan tool, observe GEN F-Terminal parameter in Powertrain Control Module (PCM) data list. If scan tool GEN F-Terminal parameter is within 5-95 percent, go to next step. If scan tool GEN F-Terminal parameter is not within 5-95 percent, go to step 4 .
Using scan tool, command generator OFF. If scan tool indicates zero percent, problem is intermittent. Check wiring and connections If scan tool does not indicate zero percent, go to next step.
Turn ignition switch to OFF position. Disconnect generator harness connector. Connect a test light to battery positive voltage. Turn ignition switch to RUN position. Using test light, probe generator harness connector terminal "C" (Gray wire). Using scan tool, observe GEN-F Terminal Signal parameter in PCM data list. If GEN-F Terminal Signal parameter is near 100 percent, test primary generator. See TEST A: CHARGING SYSTEM TEST under SYSTEM TESTS. If GEN-F Terminal Signal parameter is not near 100 percent, go to next step.
Test Gray wire for a short or an open between generator harness connector terminal "C" and PCM harness connector C2 terminal No. 79. See WIRING DIAGRAMS . If problem exists, repair circuit as necessary. After repair, go to step 8 . If problem does not exist, go to step 6 .
Inspect PCM harness connector for poor connections. If problem exists, repair as necessary. After repair, go to step 8 . If problem does not exist, go to next step.
Replace PCM. See REMOVAL, OVERHAUL & INSTALLATION - CARS article in ENGINE PERFORMANCE. Program PCM. After repair, go to next step.
Review and record scan tool Fail Records data. Using scan tool, clear DTCs. Start engine. Using scan tool, observe Specific information for DTC P0622 until test runs. If scan tool indicates DTC P0622 failed this ignition cycle, repeat test beginning at step 2 . If scan tool indicates DTC P0622 passed this ignition cycle, system is okay.