Diagnosis And Testing - On-Board Diagnostic System: Inspection

The Powertrain Control Module (PCM) monitors critical input and output circuits of the charging system, making sure they are operational. A Diagnostic Trouble Code (DTC) is assigned to each input and output circuit monitored by the On-Board Diagnostic (OBD) system. Some charging system circuits are checked continuously, and some are checked only under certain conditions.

Refer to Diagnostic Trouble Codes in; Powertrain Diagnostic service information for more DTC information. This will include a complete list of DTCs including DTCs for the charging system.

To perform a complete test of the charging system, refer to the appropriate Powertrain Diagnostic Procedures service informaiton and the scan tool. Perform the following inspections before attaching the scan tool.

1. Inspect the battery condition. Refer to the Battery section for procedures. Refer to DIAGNOSIS AND TESTING .
2. Inspect condition of battery cable terminals, battery posts, connections at engine block, starter solenoid. They should be clean and tight. Repair as required. Inspect generator electrical connections at generator field, battery output, and ground terminal (if equipped). Also check generator ground wire connection at engine (if equipped). They should all be clean and tight. Repair as required.
3. Inspect all fuses in the fuse block for tightness in receptacles. They should be properly installed and tight. Repair or replace as required.
4. Inspect generator mounting bolts for tightness. Replace or tighten bolts if required. Refer to the Generator Removal/Installation section of this group for torque specifications. Refer to TECHNICAL SPECIFICATIONS .
5. Inspect generator drive belt condition and tension. Tighten or replace belt as required.
6. Inspect clutch pulley (if equipped). Ensure clutch pulley is driving the alternator rotor.
7. Inspect automatic belt tensioner (if equipped). Refer to the Cooling System for more information.