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DTC P0118 ENGINE COOLANT TEMPERATURE CIRCUIT HIGH INPUT

DTC P0118 ENGINE COOLANT TEMPERATURE CIRCUIT HIGH INPUT

DTC DETECTING CONDITION:


• Immediately at fault recognition

• GENERAL DESCRIPTION


TROUBLE SYMPTOM:


• Hard to start

• Erroneous idling

• Poor driving performance


Important

After repair or replacement of faulty parts, conduct Clear Memory Mode and Inspection Mode .


WIRING DIAGRAM:


CHECK CURRENT DATA.

Start the engine.

Read the data of engine coolant temperature sensor signal using Vehicle Diagnostic Interface or OBD-II general scan tool.

Note
• Vehicle Diagnostic Interface

For detailed operation procedure, refer to the “READ CURRENT DATA FOR ENGINE”.

• OBD-II general scan tool

For detailed operation procedures, refer to the OBD-II General Scan Tool Instruction Manual.


Is the engine coolant temperature less than −40°C (−40°F)?

Yes

• Repair poor contact.

•
Note

In this case, repair the following:

• Poor contact in engine coolant temperature sensor

• Poor contact in ECM

• Poor contact in coupling connector

• Poor contact in joint connector



No


CHECK HARNESS BETWEEN ENGINE COOLANT TEMPERATURE SENSOR AND ECM CONNECTOR.

Turn the ignition switch to OFF.

Disconnect the connector from engine coolant temperature sensor.

Measure the voltage between engine coolant temperature sensor connector and engine ground.

Connector & terminal

(E8) No. 3 (+) — Engine ground (−):

Is the voltage more than 10 V?

Yes

Repair battery short circuit in harness between ECM and engine coolant temperature sensor connector.


No


CHECK HARNESS BETWEEN ENGINE COOLANT TEMPERATURE SENSOR AND ECM CONNECTOR.

Turn the ignition switch to ON.

Measure the voltage between engine coolant temperature sensor connector and engine ground.

Connector & terminal

(E8) No. 3 (+) — Engine ground (−):

Is the voltage more than 10 V?

Yes

Repair battery short circuit in harness between ECM and engine coolant temperature sensor connector.


No


CHECK HARNESS BETWEEN ENGINE COOLANT TEMPERATURE SENSOR AND ECM CONNECTOR.

Measure the voltage between engine coolant temperature sensor connector and engine ground.

Connector & terminal

(E8) No. 3 (+) — Engine ground (−):

Is the voltage more than 4 V?

Yes


No

• Repair harness and connector.

•
Note

In this case, repair the following:

• Open circuit in harness between ECM and engine coolant temperature sensor connector

• Poor contact in engine coolant temperature sensor connector

• Poor contact in ECM connector

• Poor contact in coupling connector

• Poor contact in joint connector



CHECK HARNESS BETWEEN ENGINE COOLANT TEMPERATURE SENSOR AND ECM CONNECTOR.

Turn the ignition switch to OFF.

Measure the resistance of harness between engine coolant temperature sensor connector and engine ground.

Connector & terminal

(E8) No. 2 — Engine ground:

Is the resistance less than 5 Ω?

Yes

Replace the engine coolant temperature sensor.


No

• Repair harness and connector.

•
Note

In this case, repair the following:


• • Open circuit in harness between ECM and engine coolant temperature sensor connector

• • Poor contact in engine coolant temperature sensor connector

• • Poor contact in ECM connector

• • Poor contact in coupling connector

• • Poor contact in joint connector