Diagnostic Instructions

DTC Descriptors

DTC P0180 03: Fuel Temperature Sensor Circuit Voltage Below Threshold

DTC P0180 07: Fuel Temperature Sensor Circuit Voltage Above Threshold

DTC P0182: Fuel Temperature Sensor Circuit Low Voltage

DTC P0183: Fuel Temperature Sensor Circuit High Voltage

Circuit/System Description

The fuel temperature sensor is integrated within the fuel filter assembly. The fuel temperature sensor is a variable resistor that measures the temperature of the fuel. The engine control module (ECM) supplies 5 volts to the signal circuit and supplies a ground to the low reference circuit. The following table illustrates the difference between temperature, resistance, and voltage:

Fuel Temperature Sensor	Resistance	Signal Voltage
Cold	High	High
Warm	Low	Low

Conditions for Running the DTC

Conditions for Setting the DTC

P0180 03 or P0182

The ECM detects that the fuel temperature sensor voltage is less than 0.127 volt for 0.5 second.

P0180 07 or P0183

The ECM detects that the fuel temperature sensor voltage is greater than 4.9 volts for 0.5 second.

Action Taken When the DTC Sets

DTCs P0180, P0182, and P0183 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0180, P0182, and P0183 are Type B DTCs.

Diagnostic Aids

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

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. DTCs P0180 03, P0180 07, P0182, or P0183 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 fuel filter assembly.
2. Test for less than 5 ohms between the low reference circuit terminal 6 and ground.

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

3. Install the MAIN fuse. Ignition ON, verify the scan tool fuel temperature sensor parameter is at 5 volts.

⇒	If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.

Notice: Do NOT use the low reference circuit in the component harness connector for this test. Damage to the control module may occur due to excessive current draw.

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

4. Install a 1A fused jumper wire between the signal circuit terminal 5 and ground. Verify the scan tool fuel temperature sensor parameter is at 0 volts.

⇒	If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.

5. If all circuits test normal, test or replace the fuel temperature sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.