TROUBLE SHOOTING
Verify customer's concern by operating system. Inspect for blown fuses, damaged fusible links, wiring or harness connectors. Check for loose or frayed drive belt, loose generator ground wire, or corroded battery terminals. Ensure battery is fully charged, and battery cables are in good condition with connections clean and secure. Inspect generator and Powertrain Control Module (PCM) harness connections. Check engine ground strap. If fault is found, repair as necessary. If no fault is found, perform self-diagnostics. See SELF-DIAGNOSTIC SYSTEM.
SELF-DIAGNOSTIC SYSTEM
| CAUTION | When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery. |
If a problem is sensed in a monitored circuit, a DTC will be stored in PCM memory. Voltage indicator light and Malfunction Indicator Light (MIL) will illuminate, provided specific criteria are met. A specific DTC results from a particular system failure. DTC only indicates problem in circuit. It does not identify specific component failure in circuit.
If problem is repaired or ceases to exist, PCM automatically clears DTC after 40 warm-up cycles. DTCs can also be cleared using scan tool. See CLEARING DIAGNOSTIC TROUBLE CODES .
RETRIEVING DIAGNOSTIC TROUBLE CODES
| DTC (1) | SCAN TOOL DTC MESSAGES |
|---|---|
| P0562 | CHARGING SYSTEM VOLTAGE TOO LOW |
| P0563 | CHARGING SYSTEM VOLTAGE TOO HIGH |
| P0622 | GENERATOR FIELD NOT SWITCHING PROPERLY |
| P0625 | GENERATOR FIELD CONTROL CIRCUIT LOW |
| P0626 | GENERATOR FIELD CONTROL CIRCUIT HIGH |
| P1594 | CHARGING SYSTEM VOLTAGE TOO HIGH |
| P1682 | CHARGING SYSTEM VOLTAGE TOO LOW |
| (1) For all other PCM DTCs, refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS article. | |
| (1) | For all other PCM DTCs, refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS article. |
SCAN TOOL DTC MESSAGES
CLEARING DIAGNOSTIC TROUBLE CODES
Powertrain Control Module (PCM) automatically clears DTC after 40 warm-up cycles. DTCs can also be cleared using scan tool.
SCAN TOOL PROBLEMS & ERROR MESSAGES
Note. For more information on scan tool and PCM diagnostics, see SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.