Diagnostic Test

1) MEASURE FUEL LEVEL SENSOR CIRCUIT VOLTAGE

Fig 1: Checking Sensor Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Fuel Level Sensor harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Turn the ignition on.

Measure the voltage between cavity 1 and cavity 2 of the Fuel Level Sensor harness connector.

Is the voltage approximately.7 of a volt?

Yes
1. Replace the Fuel Level Sensor. (Refer to FUEL SYSTEM/FUEL DELIVERY/FUEL LEVEL SENDING UNIT / SENSOR - REMOVAL) .
2. Perform BODY VERIFICATION TEST .
No
1. Go to step 2).
2) MEASURE FUEL LEVEL SENSOR CIRCUIT RESISTANCE

Fig 2: Checking Sensor Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Instrument Cluster C2 harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Connect a jumper wire between cavity 1 and cavity 2 of the Fuel Level Sensor harness connector.

Measure the resistance of the Fuel Level Sensor circuit from cavity D4 to cavity D5 at the Instrument Cluster C2 harness connector.

Is the resistance below 5.0 ohms?

Yes
1. Replace the Instrument Cluster. (Refer to ELECTRICAL/INSTRUMENT CLUSTER - REMOVAL) .
2. Perform BODY VERIFICATION TEST .
No
1. Repair the appropriate Fuel Level Sensor circuit for an open.
2. Perform BODY VERIFICATION TEST .