Engine Electrical Diagnostic System Check
WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2001 Pontiac Sunfire, 2001 Pontiac Grand Prix, 2001 Pontiac Grand Am, 2001 Oldsmobile Intrigue, and 2001 Oldsmobile Alero. However, it is still accessible from the selected car via links, so may be relevant.
- Perform battery test and inspection. See BATTERY TESTING & INSPECTION under ON-VEHICLE TESTING. If battery passed test, go to next step. If battery did not pass test, replace battery.
- Connect scan tool to Data Link Connector (DLC). Turn ignition switch to RUN position. If scan tool powers up, go to next step. If scan tool does not power up, diagnose communication system. See appropriate BODY CONTROL MODULES article.
- Attempt communication with each module on class 2 serial data circuit; BCM, PCM and Instrument Panel Cluster (IPC). If scan tool communicates with modules, go to next step. If scan tool does not communicate with modules, diagnose communication system. See appropriate BODY CONTROL MODULES article.
- Select DISPLAY DTCS function for each module on scan tool. Record all DTCs displayed, DTC status and module which set DTC. If scan tool displayed DTCs, go to next step. If scan tool does not display DTCs, diagnose charging system by symptom. See SYMPTOM INDEX table under SYSTEM TESTS.
- If scan tool does not display DTCs that begin with "U", go to next step. If scan tool displays DTCs that begin with "U", diagnose communication system. See appropriate BODY CONTROL MODULES article.
- If scan tool displays DTCs that begin with "B", see appropriate BODY CONTROL MODULES article. If scan tool does not display DTCs that begin with "B", perform appropriate test in accordance with DTCs retrieved. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .