For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### DTC Descriptors

DTC P2264: Water In Fuel Sensor Circuit

### Circuit/System Description

The water in fuel (WIF) sensor is located in the bottom of the fuel filter housing. The engine control module (ECM) monitors the WIF sensor signal circuit for a predetermined voltage.

### Conditions for Running the DTC

• | The ignition is ON.

• | The DTC runs continuously once the above condition is met.

### Conditions for Setting the DTC

The ECM detects an incorrect WIF signal for more than 3 seconds.

### Action Taken When the DTC Sets

DTC P2264 is a Type C DTC.

### Conditions for Clearing the DTC

DTC P2264 is a Type C DTC.

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

1. Engine running, observe the DTC information with a scan tool. DTC P2264 should not set.
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

### Circuit/System Testing

1. Ignition OFF, and the MAIN fuse removed, disconnect the harness connector at the WIF sensor.
2. Test for less than 5 ohms of resistance between the ground circuit terminal 2 and ground.

⇒ | If greater than the specified range, repair the ground circuit for an open/high resistance.

3. Install the MAIN fuse. Ignition ON, verify that a test lamp illuminates between the ignition 1 voltage circuit terminal 3 and ground.

⇒ | If the test lamp does not illuminate, test the ignition 1 voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the fuse is open, test all the components connected to the ignition 1 voltage circuit and replace as necessary.

4. Verify the scan tool WIF sensor parameter displays No Water.

⇒ | If the parameter displays Water, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.

Important: If the fuse in the jumper wire opens, the signal circuit is shorted to a voltage and the sensor may be damaged.

5. Install a 1A fused jumper wire between the signal circuit terminal 1 and ground. Verify the scan tool WIF sensor parameter displays Water.

⇒ | If the parameter displays No Water, test the signal circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the ECM.

6. If all circuits test normal, test or replace the WIF sensor.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Water in Fuel Indicator Sensor Replacement

• | Control Module References for ECM replacement, setup, and programming