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 VoltageDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Water in Fuel Indicator Control | P2266 | -- | -- | -- |
Typical Scan Tool Data
Circuit | Short to Ground | High Resistance | Open | Short to Voltage |
|---|---|---|---|---|
Operating Conditions: Engine running Parameter Normal Range: 0.21-4.75 volts | ||||
Water in Fuel Indicator Control | 0.02-0.19 volt | -- | 4.75 volts | 4.98 volts |
Low Reference | 4.75 volts | -- | 4.75 volts | -- |
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.
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
| • | The control module stores the DTC information into memory when the diagnostic runs and fails. |
| • | The malfunction indication lamp (MIL) will not illuminate. |
| • | The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records. |
| • | The water in fuel lamp will illuminate in the instrument panel. |
Conditions for Clearing the DTC
| • | A current DTC Last Test Failed clears when the diagnostic runs and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic. |
| • | The DTC has been cleared with a scan tool, and the key has been cycled OFF in order to allow the ECM to power down. |
Diagnostic Aids
The water in the fuel will not set this DTC, but the water in fuel lamp will illuminate if this DTC sets.
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
Circuit/System Verification
- Observe the Water in Fuel Sensor voltage parameter with a scan tool. Voltage should be between 0.20-4.75 volts.
- Engine running, observe the DTC information with a scan tool. DTC P2266 should not set.
- 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/Failure Records data.
Circuit/System Testing
- Turn OFF the ignition and disconnect the water in fuel sensor.
- Turn ON the ignition and clear the DTC.
- 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.
