DTC P0118 Engine Coolant Temperature Sensor Circuit High (4JJ3 with DPD)

1. DTC P0118 description

The engine coolant temperature sensor is installed near the thermostat housing. The engine coolant temperature sensor is a variable resistor and measures the temperature of the engine coolant. This sensor has a signal circuit and a low reference circuit. The ECM supplies 5 V to the signal circuit, and connects the ground to the low reference circuit. The sensor resistance is high when the engine coolant temperature is low, and the sensor resistance decreases as the engine coolant temperature increases. The ECM detects a high voltage when the sensor resistance is high, and a low voltage when the sensor resistance is low. If the ECM detects an excessively high signal voltage, the DTC is set.

2. Condition for setting DTC P0118

Condition for running the DTC

The battery voltage is 9 to 16 V.
The ignition switch is ON.
The engine runtime is 3 minutes or more.
DTCs P060B and P0697 are not set.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P060B Internal Control Module A/D Processing Performance".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0697 Sensor Reference Voltage 3 Circuit".

Condition for setting the DTC

The ECM detects that the engine coolant temperature sensor signal voltage is 4.85 V or more for 3 seconds.

3. Action taken when DTC P0118 sets

The ECM illuminates the MIL. Refer to Action taken when DTC sets - Type A.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC type definitions".

The ECM limits the fuel injection quantity.
The ECM inhibits the EGR control.
The ECM inhibits the cruise control.
The ECM assumes a default engine coolant temperature sensor value.

4. Condition for clearing DTC P0118

Refer to Conditions for clearing the MIL/DTC - Type A or Type B.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC type definitions".