P0621-GENERATOR LAMP/L-TERMINAL CONTROL CIRCUIT OPEN

For a complete wiring diagram Refer to Section 8W

When Monitored:
With the ignition on.
Set Condition:
The ECM detects an open or short to ground on the Charge Indicator Signal circuit.

Possible Causes

INTERMITTENT DTC

(G329) CHARGE INDICATOR SIGNAL CIRCUIT SHORTED TO GROUND

(G329) CHARGE INDICATOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

GENERATOR

ENGINE CONTROL MODULE (ECM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

1.DTC IS ACTIVE

Is the status Active for this DTC?

Yes

Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

2.(G329) CHARGE INDICATOR SIGNAL CIRCUIT SHORTED TO GROUND

Is the resistance above 1000 ohms?

Yes

Repair the (G329) Charge Indicator Signal circuit for a short to ground.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

3.(G329) CHARGE INDICATOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

Is the resistance below 10.0 ohms?

Yes

Repair the (G329) Charge Indicator Signal circuit for an open circuit or high resistance.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

4.GENERATOR

Is the status Active for this DTC?

Yes

Test complete
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

5.ENGINE CONTROL MODULE (ECM)

Were any problems found?

Yes

Repair as necessary.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Replace the Engine Control Module (ECM) in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)