DTC P0181 [MZR-CD (RF Turbo)]

DTC P0181	Fuel temperature sensor circuit range/performance malfunction
DETECTION CONDITION	• The PCM monitors the input signal from the fuel temperature sensor. If the difference between the fuel temperature before engine warm-up and the fuel temperature after engine warm-up is less than 1 °C {1.8 °F} or more than 254 °C {457 °F}, the PCM determines that there is a malfunction in fuel temperature sensor.
POSSIBLE CAUSE	• Fuel temperature sensor malfunction • Connector or terminal malfunction • PCM malfunction

DTC P0181

Fuel temperature sensor circuit range/performance malfunction

DETECTION CONDITION

• The PCM monitors the input signal from the fuel temperature sensor. If the difference between the fuel temperature before engine warm-up and the fuel temperature after engine warm-up is less than 1 °C {1.8 °F} or more than 254 °C {457 °F}, the PCM determines that there is a malfunction in fuel temperature sensor.

POSSIBLE CAUSE

• Fuel temperature sensor malfunction

• Connector or terminal malfunction

• PCM malfunction

STEP	INSPECTION	ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
No	Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related service repair information availability. • Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to the next step.
No	Go to the next step.
3	VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT? • Connect the M-MDS to the DLC-2. • Clear the DTC from the PCM memory using the M-MDS. • Start the engine. • Is the PENDING CODE for this DTC present?	Yes	Go to the next step.
No	Intermittent concern exists. Perform the “INTERMITTENT CONCERN TROUBLESHOOTING”. (See INTERMITTENT CONCERN TROUBLESHOOTING [MZR-CD (RF Turbo)].)
4	INSPECT FUEL TEMPERATURE SENSOR CONNECTOR FOR POOR CONNECTION • Turn the engine switch off. • Disconnect the fuel temperature sensor connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 7.
No	Go to the next step.
5	INSPECT FUEL TEMPERATURE SENSOR • Inspect the fuel temperature sensor. (See FUEL PRESSURE SENSOR INSPECTION [MZR-CD (RF Turbo)].) • Is there any malfunction?	Yes	Replace the fuel temperature sensor, then go to Step 7.
No	Go to the next step.
6	INSPECT PCM CONNECTOR FOR POOR CONNECTION • Turn the engine switch off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal, then go to the next step.
No	Go to the next step.
7	VERIFY TROUBLESHOOTING OF DTC P0181 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. • Start the engine. • Is the PENDING CODE for this DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
No	Go to the next step.
8	VERIFY AFTER REPAIR PROCEDURE • Perform the Repair Verification Drive Mode. (See OBD DRIVE MODE [MZR-CD (RF Turbo)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR-CD (RF Turbo)].)
No	DTC troubleshooting completed.

STEP

INSPECTION

ACTION

VERIFY FREEZE FRAME DATA HAS BEEN RECORDED

• Has FREEZE FRAME DATA been recorded?

Yes

Go to the next step.

Record the FREEZE FRAME DATA on the repair order, then go to the next step.

VERIFY RELATED REPAIR INFORMATION AVAILABILITY

• Verify related service repair information availability.

• Is any related repair information available?

Yes

Perform repair or diagnosis according to the available repair information.

• If the vehicle is not repaired, go to the next step.

Go to the next step.

VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT?

• Connect the M-MDS to the DLC-2.

• Clear the DTC from the PCM memory using the M-MDS.

• Start the engine.

• Is the PENDING CODE for this DTC present?

Yes

Go to the next step.

Intermittent concern exists.

Perform the “INTERMITTENT CONCERN TROUBLESHOOTING”.

(See INTERMITTENT CONCERN TROUBLESHOOTING [MZR-CD (RF Turbo)].)

INSPECT FUEL TEMPERATURE SENSOR CONNECTOR FOR POOR CONNECTION

• Turn the engine switch off.

• Disconnect the fuel temperature sensor connector.

• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair or replace the terminal, then go to Step 7.

Go to the next step.

INSPECT FUEL TEMPERATURE SENSOR

• Inspect the fuel temperature sensor.

(See FUEL PRESSURE SENSOR INSPECTION [MZR-CD (RF Turbo)].)

• Is there any malfunction?

Yes

Replace the fuel temperature sensor, then go to Step 7.

Go to the next step.

INSPECT PCM CONNECTOR FOR POOR CONNECTION

• Turn the engine switch off.

• Disconnect the PCM connector.

• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair or replace the terminal, then go to the next step.

Go to the next step.

VERIFY TROUBLESHOOTING OF DTC P0181 COMPLETED

• Make sure to reconnect all disconnected connectors.

• Clear the DTC from the PCM memory using the M-MDS.

• Start the engine.

• Is the PENDING CODE for this DTC present?

Yes

Replace the PCM, then go to the next step.

(See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)

Go to the next step.

VERIFY AFTER REPAIR PROCEDURE

• Perform the Repair Verification Drive Mode.

(See OBD DRIVE MODE [MZR-CD (RF Turbo)].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [MZR-CD (RF Turbo)].)

DTC troubleshooting completed.