DTC P0115 Engine Coolant Temperature Circuit; DTC P0117 Engine Coolant Temperature Circuit Low Input; DTC P0118 Engine Coolant Temperature Circuit High Input: Description
WARNING: This page is about a different car, the 2007 Lexus RX 350. 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, of which the resistance value varies according to the ECT.
The structure of the sensor and its connection to the ECM are the same as those of the Intake Air Temperature (IAT) sensor.
HINT:
When any of DTCs P0115, P0117 and P0118 are set, the ECM enters fail-safe mode. During fail-safe mode, the ECT is estimated to be 80°C (176°F) by the ECM. Fail-safe mode continues until a pass condition is detected.
DTC TROUBLE DETECTION CONDITION CHART
| DTC No. | Proceed to | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| P0115 | Step 1 | Open or short in Engine Coolant Temperature (ECT) sensor circuit for 0.5 seconds (1 trip detection logic) |
|
| P0117 | Step 4 | Short in Engine Coolant Temperature (ECT) sensor circuit for 0.5 seconds (1 trip detection logic) |
|
| P0118 | Step 2 | Open in Engine Coolant Temperature (ECT) sensor circuit for 0.5 seconds (1 trip detection logic) |
|
HINT:
When any of these DTCs are set, check the ECT by selecting the following menu items on the intelligent tester: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / COOLANT TEMP.
TEMPERATURE CHART
| Temperature Displayed | Malfunctions |
|---|---|
| -40°C (-40°F) | Open circuit |
| 140°C (284°F) or higher | Short circuit |