Normal Operation

The charging system warning indicator is used to indicate when the generator output is insufficient to maintain the battery state of charge. When the key is in the RUN position and the engine is off (KOEO) or there is a low charging system concern, the instrument cluster supplies voltage to the charging system warning indicator, which is grounded internally within the instrument cluster. When the engine is started, the generator supplies a ground path on circuit (G) to redirect voltage away from the bulb, turning off the charging system warning indicator.

This pinpoint test is intended to diagnose the following:

Wiring, terminals or connectors
Charging system
Generator
Instrument cluster
CAUTION:
- Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

CHARGING SYSTEM WARNING INDICATOR PINPOINT TEST 7

PINPOINT TEST 7		THE CHARGING SYSTEM WARNING INDICATOR IS NEVER/ALWAYS ON
STEP	INSPECTION		ACTION
1	CHECK THE CHARGING SYSTEM OPERATION Check the charging system for correct operation. See CHARGING SYSTEM INSPECTION AND VERIFICATION . Does the charging system operate correctly?	Yes	If the charging system warning indicator in inoperative, go to next step. If the charging system warning indicator is always on, go to step 4.
1		No	See CHARGING SYSTEM INSPECTION AND VERIFICATION to diagnose the system.
2	CHECK CIRCUIT (G) FOR A SHORT TO VOLTAGE Key in OFF position. Disconnect: Generator connector 0117-03. Disconnect: Instrument Cluster connector 0922-102. Key ON engine OFF (KOEO) Measure the voltage between the instrument cluster 0922-102 pin 20, circuit (G), harness side and ground. Is any voltage present?	Yes	REPAIR the circuit. TEST the system for normal operation.
2		No	Go to next step
3	CHECK CIRCUIT (G) FOR A SHORT TO GROUND Key in OFF position. Pressure the resistance between the instrument cluster 0922-102 pin 20, circuit (G), harness side and ground. Is the resistance greater than 10,000 ohms?	Yes	Go to step 6.
3		No	REPAIR the circuit. TEST the system for normal operation.
4	CHECK THE GENERATOR FOR CORRECT OPERATION Key in OFF position. Disconnect Generator connector 0117-01 (2.3L engine) or 0117-04 (4.0L engine). For 2.3L engines, connect a fused (5A) jumper wire between the generator 0117-01 pin 1, circuit (G), harness side and ground. For 4.0L engines, connect a fused (5A) jumper wire between the generator 0117-04 pin 1, circuit (G), harness side and ground. Key ON engine OFF (KOEO). Observe the charging system warning indicator. Does the charging system warning indicator turn off?	Yes	INSTALL a new generator. See GENERATOR REMOVAL / INSTALLATION -- 2.3L or GENERATOR REMOVAL / INSTALLATION -- 4.0L . TEST the system for normal operation.
4		No	Go to next step.
5	CHECK CIRCUIT (G) FOR AN OPEN Key in OFF position. Disconnect: Instrument Cluster connector 0922-102. For 2.3L engines, measure the resistance between the instrument cluster 0922-102 pin 20, circuit (G), harness side and the generator 0117-01 pin 1, circuit (G), harness side. For 4.0L engines, measure the resistance between the instrument cluster 0922-102 pin 20, circuit (G), harness side and the generator 0117-04 pin 1, circuit (G), harness side. Is the resistance less than 5 ohms?	Yes	Go to next step.
5		No	REPAIR the circuit. TEST the system for normal operation.
6	CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION Disconnect all the instrument cluster connectors. Check for: corrosion damaged pins pushed-out pins incorrectly installed bulb sockets burnt-out bulbs Connect all the instrument cluster connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present?	Yes	INSTALL a new instrument cluster. See INSTRUMENT CLUSTER . TEST the system for normal operation.
6		No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.