Service Information

Captiva

DTC P0181, P0182, or P0183 - LNP or LNQ

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 P0181 00: Fuel Temperature Sensor Performance

DTC P0182 00: Fuel Temperature Sensor Circuit Low Voltage

DTC P0183 00: Fuel Temperature Sensor Circuit High Voltage

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Signal	P0182 00	P0183 00	P0183 00	P0181 00
Low Reference	-	P0183 00	-	P0181 00

Typical Scan Tool Data

Fuel Temperature Sensor

Circuit	Short to Ground	Open	Short to Voltage
*Operating Conditions:* Ignition ON *Parameter Normal Range:* 0.12-4.9 V
Signal	0.0 V	5.0 V	5.0 V
Low Reference	5.0 V	5.0 V	-

Circuit

Short to Ground

Open

Short to Voltage

Operating Conditions: Ignition ON

Parameter Normal Range: 0.12-4.9 V

Signal

0.0 V

5.0 V

Low Reference

5.0 V

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 V to the signal circuit and supplies an 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

•	The ignition is ON or the engine is running.

•	The DTCs run continuously once the above condition is met.

Conditions for Setting the DTC

P0181 00

The fuel temperature and Inlet Air Temperature (IAT) 1 are more than 100°C (180°F) of each other at start-up.

The fuel temperature and IAT 1 are more than 10°C (18°F) of each other at start-up.

The IAT 1 has dropped more than 2.5°C (4.5°F) after running more than 6 min above 24 km/h (15 MPH).

P0182 00

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

P0183 00

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

•	A short to a separate 5 V source may set a DTC P0183 00.

•	A skewed sensor may result in poor driveability concerns.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

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

Engine running, observe the DTC information with a scan tool. DTCs P0181 00, P0182 00, or P0183 00 should not set.
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

Ignition OFF, disconnect the harness connector at the E11 Fuel Heater.
Test for less than 5 Ω between the low reference circuit terminal 3 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 K20 Engine Control Module.

Ignition On, test for 4.8 - 5.2 V between the signal circuit terminal 1 and ground.

⇒	If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.

⇒	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 K20 Engine Control Module.

If all circuits test normal, replace the E11 Fuel Heater.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming