P2068-FUEL LEVEL SENSOR 2 CIRCUIT HIGH

For a complete wiring diagram Refer to Section 8W

When Monitored:
With the ignition on and battery voltage greater than 10.4 volts.
Set Condition:
The PCM detects that the Fuel Level Sensor input voltage is above the maximum acceptable value.

Possible Causes

INTERMITTENT DTC

(N5) FUEL LEVEL SIGNAL 2 CIRCUIT SHORTED TO VOLTAGE

(N5) FUEL LEVEL SIGNAL 2 CIRCUIT OPEN OR HIGH RESISTANCE

(Z965) GROUND CIRCUIT OPEN OR HIGH RESISTANCE

FUEL LEVEL SENSOR

INSTRUMENT CLUSTER (CCN)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Diagnostic Test

1. DTC IS ACTIVE

Start the engine and allow it to reach normal operating temperature.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

With the scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

Go to 2

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

2. (N5) FUEL LEVEL SIGNAL 2 CIRCUIT SHORTED TO VOLTAGE

Turn the ignition off.
Disconnect the Fuel Level Sensor connector.
Disconnect the Instrument Cluster (CCN) connector.
Turn the ignition on.
Measure the voltage of the (N5) Fuel Level Signal 2 circuit in the Fuel Level Sensor harness connector.

Is there any voltage present?

Yes

Repair the (N5) Fuel Level Signal 2 circuit for a short to voltage.

Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

Go to 3

3. (N5) FUEL LEVEL SIGNAL 2 OPEN OR HIGH RESISTANCE

Turn the ignition off.
Measure the resistance of the (N5) Fuel Level Signal 2 circuit between the Fuel Level Sensor harness connector and the Instrument Cluster (CCN) harness connector.

Is the resistance below 5.0 ohms?

Yes

Go to 4

Repair the (N5) Fuel Level Signal 2 circuit for an open circuit or high resistance.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

4. (Z965) GROUND CIRCUIT OPEN OR HIGH RESISTANCE

Measure the resistance between ground and the (Z965) Ground circuit at the Fuel Level Sensor harness connector.

Is the resistance below 5.0 ohms?

Yes

Go to 5

Repair the (Z965) Ground circuit for an open circuit or high resistance.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

5. FUEL LEVEL SENSOR

Turn the ignition off.
Connect the Instrument Cluster (CCN) connector.
Connect a jumper wire between the (N5) Fuel Level Signal 2 circuit and the (Z965) Ground in the Fuel Level Sensor harness connector.
Turn the ignition on.
With the scan tool, read the Fuel Level Sensor 2 signal voltage.

Is the voltage below 1.0 volt with the jumper wire in place?

Yes

Replace the Fuel Level Sensor in accordance with the Service Information.

Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

Go to 6

6. INSTRUMENT CLUSTER (CCN)

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Level Sensor and the Instrument Cluster (CCN).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
Look for the data to change or for the DTC to reset during the wiggle test.
Refer to any Technical Service Bulletins that may apply.

Were any problems found?

Yes

Repair as necessary.

Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

Replace and program the Instrument Cluster (CCN) in accordance with the Service Information.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).