P0118

A : DTC P0116, P0117, P0118, P0125. ECT Sensor.

A1 : CHECK THE ECT SENSOR RESISTANCE
1. Measure the resistance between pins 1 and 2 of the Engine Coolant Temperature sensor.

Is the resistance 2437 to 2464 ohms at 20 degrees C?

Yes
Goto A2

No
Install a new ECT sensor. CLEAR the DTCs. TEST the system for normal operation.

A2 : CHECK THE ENGINE COOLANT TEMPERATURE (ECT) SENSOR SIGNAL WIRE FOR OPEN CIRCUIT
1. Turn the ignition switch to the OFF position.
2. Disconnect the ECT sensor electrical connector PI25.
3. Disconnect the PCM electrical connector, PI01.
4. Measure the resistance between the ECT sensor electrical connector PI25, pin 2 (UY) and the PCM electrical connector PI01, pin 70 (UY).

Is the resistance less than 5 ohms?

Yes
Goto A3

No
Repair the circuit. For additional information, refer to the wiring diagrams. CLEAR the DTCs. TEST the system for normal operation.

A3 : CHECK THE ECT SENSOR SIGNAL WIRE FOR A SHORT TO GROUND
1. Measure the resistance between the ECT sensor electrical connector PI25, pin 2 (UY) and PI01, pin 19.

Is the resistance less than 10,000 ohms?

Yes
Repair the short to GROUND. For additional information, refer to the wiring diagrams. CLEAR the DTCs. TEST the system for normal operation.

No
Goto A4

A4 : CHECK THE ECT SENSOR GROUND CIRCUIT
1. Measure the resistance between the ECT sensor electrical connector PI25, pin 1 (BG) and GROUND.

Is the resistance less than 5 ohms?

Yes
Goto A5

No
Repair the circuit. For additional information, refer to the wiring diagrams. CLEAR the DTCs. TEST the system for normal operation.

A5 : CHECK THE ECT SENSOR GROUND CIRCUIT FOR A SHORT TO BATTERY POSITIVE
1. Turn the ignition switch to the ON position.
2. Measure the voltage between the ECT electrical connector PI25, pin 1 (BG) and GROUND.

Is a voltage present?

Yes
Repair the circuit. For additional information, refer to the wiring diagrams. CLEAR the DTCs. TEST the system for normal operation.

No
Goto A6

A6 : CHECK THE ECT SENSOR CIRCUIT FOR A SHORT TO BATTERY POSITIVE
1. Connect the PCM electrical connector PI01.
2. Turn the ignition switch to the ON position.
3. Measure the voltage between the ECT sensor electrical connector PI25, pin 2 (UY) and GROUND.

Is the voltage greater than 5 volts?

Yes
Repair the short to battery positive. For additional information, refer to the wiring diagrams. CLEAR the DTCs. TEST the system for normal operation.

No
Install a new ECT sensor. CLEAR the DTCs. TEST the system for normal operation. If the DTC is repeated, INSTALL a new PCM.