P2068
P2068-FUEL LEVEL SENSOR 2 CIRCUIT HIGHP2068-Fuel Level Sensor 2 Circuit High:
WHEN MONITORED
Ignition on and battery voltage above 10.4 volts.
SET CONDITION
The fuel level sensor signal voltage at the PCM goes above 4.9 volts for more than 90 seconds. One Trip Fault. Three good trips to turn off the MIL.
POSSIBLE CAUSES
- (N5) Fuel level signal circuit shorted to battery voltage
- (N5) Fuel level signal circuit open
- (Z210) Fuel level sensor ground circuit open
- Fuel level sensor
- Instrument cluster
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
Diagnostic Test
1. FUEL LEVEL SENSOR VOLTS ABOVE 4.9 VOLTS
NOTE: Diagnose any CAN - B and CAN - C Communication DTCs before continuing.
Ignition on, engine not running.
With a scan tool, read the Fuel Level Sensor voltage.
Q: Is the Fuel Level Sensor voltage above 4.9 volts?
YES: Go To 2
NO: Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Intermittent Condition
Perform BODY VERIFICATION TEST VER - 1. Body Verification Test
2. FUEL LEVEL SENSOR
Turn the ignition off.
Disconnect the Fuel Pump Module electrical harness connector
Ignition on, engine not running.
Connect a jumper wire between the (N5) Fuel Level Signal circuit and the (Z210) Fuel Level Sensor Ground circuit in the Fuel Pump Module harness connector.
With the scan tool, read the Fuel Level Sensor voltage.
Q: Did the Fuel Level Sensor voltage change from above 4.8 volts to below 0.4 of a volt with the jumper wire installed?
YES: Replace the Fuel Level Sensor. Perform BODY VERIFICATION TEST VER - 1. Body Verification Test
NO: Go To 3
NOTE: Remove the jumper wire before continuing.
3. (N5) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
Turn the ignition off.
Disconnect the C2 Cluster harness connector
Ignition on, engine not running.
Measure the voltage on the (N5) Fuel Level Signal circuit in the Fuel Pump Module harness connector.
Q: Is the voltage above 5.2 volts?
YES: Repair the short to battery voltage in the (N5) Fuel Level Signal circuit. Perform BODY VERIFICATION TEST VER - 1. Body Verification Test
NO: Go To 4
4. (N5) FUEL LEVEL SIGNAL CIRCUIT OPEN
Turn the ignition off.
Measure the resistance of the (N5) Fuel Level Signal circuit from the Fuel Pump Module harness connector to the C2 Cluster harness connector.
Q: Is the resistance below 5.0 ohms?
YES: Go To 5
NO: Repair the open in the (N5) Fuel Level Signal circuit. Perform BODY VERIFICATION TEST VER - 1. Body Verification Test
5. (Z210) FUEL LEVEL SENSOR GROUND CIRCUIT OPEN
Measure the resistance of the (Z210) Fuel Level Sensor Ground circuit from the Fuel Pump Module harness connector to the C2 Cluster harness connector.
Q: Is the resistance below 5.0 ohms?
YES: Go To 6
NO: Repair the open in the (Z210) Fuel Level Sensor Ground circuit. Perform BODY VERIFICATION TEST VER - 1. Body Verification Test
6. INSTRUMENT CLUSTER
NOTE: Before continuing, check the Instrument Cluster harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.
Q: Were there any problems found?
YES: Repair as necessary. Perform BODY VERIFICATION TEST VER - 1. Body Verification Test
NO: Replace and program the Instrument Cluster. Perform BODY VERIFICATION TEST VER - 1. Body Verification Test