P2266

DTC P2266

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 Descriptor

DTC P2266
- Water in Fuel Sensor Circuit Low Voltage

Diagnostic Fault Information






Typical Scan Tool Data






Circuit/System Description

A sensor mounted in the bottom of the fuel filter housing is use to detect water in the fuel. The water in fuel (WIF) sensor has an indicator control circuit and a low reference circuit. The engine control module (ECM) monitors the voltage to the WIF sensor. If the voltage is incorrect, the ECM will illuminate the WIF lamp and set the appropriate DTC.

Conditions for Running the DTC

* The engine is running.
* This diagnostic runs continuously.

Conditions for Setting the DTC

The engine is running.

The WIF sensor voltage is less than 0.20 volt for more than 1 second.

Action Taken When the DTC Sets

DTC P2266 is a Type C DTC.

Conditions for Clearing the DTC

DTC P2266 is a Type C DTC.

Diagnostic Aids

The water in the fuel will not set this DTC, but the water in fuel lamp will illuminate if this DTC sets.

Circuit/System Verification

1. Observe the Water in Fuel Sensor voltage parameter with a scan tool. Voltage should be between 0.20-4.75 volts.
2. Engine running, observe the DTC information with a scan tool. DTC P2266 should not set.
3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame Records data.

Circuit/System Testing

1. Turn OFF the ignition and disconnect the water in fuel sensor.
2. Turn ON the ignition and clear the DTC.
3. Start and run the engine.

• If this DTC resets, test the indictor control circuit for high resistance or a short to ground.
• If the DTC does not reset, Refer to Water-in-Fuel Lamp Always On.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests