DTC P0115, P0117, P0118: Engine Coolant Temperature Circuit; Engine Coolant Temperature Circuit Low Input; Engine Coolant Temperature Circuit High Input: Description
WARNING: This page is about a different car, the 2006 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
A thermistor is built into the Engine Coolant Temperature (ECT) sensor and changes the resistance value according to the engine coolant temperature.
The structure of the sensor and connection to the ECM is the same as the Intake Air Temperature (IAT) sensor.
HINT:
If the ECM detects the DTC P0115, P0117 or P0118, it operates the fail-safe function in which the ECT is assumed to be 80°C (176°F).
ENGINE COOLANT TEMPERATURE CIRCUIT
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0115 | Open or short in Engine Coolant Temperature (ECT) sensor circuit for 0.5 seconds (1 trip detection logic) |
|
| P0117 | Short in ECT sensor circuit for 0.5 seconds (1 trip detection logic) |
|
| P0118 | Open in ECT sensor circuit for 0.5 seconds (1 trip detection logic) |
|
HINT:
Confirm the ECT using the intelligent tester. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / COOLANT TEMP.
OPEN/SHORT CIRCUIT
| Temperature Displayed | Malfunction |
|---|---|
| -40°C (-40°F) | Open circuit |
| 140°C (284°F) or more | Short circuit |