Engine Electrical Diagnostic System Check
WARNING: This page is about a different car, the 2002 Pontiac Firebird and 2002 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
- Test battery. If battery is okay, go to next step. If battery is not okay, replace battery.
- Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, to right of steering column. Turn ignition switch to RUN position. If scan tool powers up, go to next step. If scan tool does not power up, perform TEST A: SCAN TOOL DOES NOT POWER UP under SYSTEM TESTS.
- Using scan tool, attempt to communicate with each module on class 2 serial data circuit. If scan tool communicates with each module, go to next step. If scan tool does not communicate with each module, perform TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS.
- Using scan tool, select DISPLAY DTCS function for each module. Record all DTCs displayed, DTC status and module which stored DTC. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair engine electrical system by symptom. See appropriate STARTERS or GENERATORS & REGULATORS article in STARTERS & CHARGING SYSTEMS.
- If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS.
- If scan tool displays DTC B1000, perform DTC B1000: BODY CONTROL MODULE INTERNAL FAULT under DIAGNOSTIC TESTS. If scan tool does not display DTC B1000, perform appropriate test in accordance with DTC retrieved. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .