Subaru Crosstrek Service Manual: Dtc p0116 engine coolant temperature sensor 1 circuit range/performance
ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC P0116 ENGINE COOLANT TEMPERATURE SENSOR 1 CIRCUIT RANGE/PERFORMANCE
DTC DETECTING CONDITION:
Detected when two consecutive driving cycles with fault occur.
TROUBLE SYMPTOM:
• Hard to start
• Improper idling
• Poor driving performance
CAUTION:
After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION">
, and Inspection Mode Inspection Mode > PROCEDURE">.
| STEP | CHECK | YES | NO |
1.CHECK FOR ANY OTHER DTC ON DISPLAY.
Is any other DTC displayed?
Check the appropriate DTC using the “List of Diagnostic Trouble Code (DTC)”. List of Diagnostic Trouble Code (DTC)">
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0116 ENGINE COOLANT TEMPERATURE SENSOR 1 CIRCUIT RANGE/PERFORMANCE">Go to Step 2.
2.CHECK ENGINE COOLANT TEMPERATURE SENSOR.
1) Disconnect the connectors from the engine coolant temperature sensor.
2) Measure the resistance between engine coolant temperature sensor terminals when the engine coolant is cold and after warmed up.
Terminals
No. 1 — No. 2:
Is the resistance of engine coolant temperature sensor different between when engine coolant is cold and after warmed up?
Repair the poor contact of ECM connector.
Replace the engine coolant temperature sensor. Engine Coolant Temperature Sensor">
1. OUTLINE OF DIAGNOSIS
Detect the malfunction of the engine coolant temperature sensor characteristics.
After the engine starts after the specified period of soaking time has elapsed, diagnose by correlation between engine coolant temperature sensor value, intake air temperature sensor value and ambient temperature sensor value. Judge as NG when the differences are both above the specified value by comparing between engine coolant temperature and ambient air temperature, engine coolant temperature and intake air temperature.
2. COMPONENT DESCRIPTION
(A) | Resistance value (k?) | (B) | Temperature °C (°F) | ||
(1) | Connector | (2) | Thermistor element |
3. EXECUTION CONDITION
Secondary parameters | Execution condition |
Battery voltage | ≥ 10.9 V |
Soaking time | ≥ 21600 s |
Block heater judgment | Completed |
Block heater operation | Not in operation |
4. GENERAL DRIVING CYCLE
Perform the diagnosis only once after the engine starts after a certain period of soaking time.
5. DIAGNOSTIC METHOD
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Malfunction Criteria | Threshold Value |
|Engine coolant temperature at engine start − Intake air temperature 30 sec. after engine start| | > Value from Map |
|Engine coolant temperature at engine start − Ambient air temperature at engine start| | > 25 °C (45°F) |
Ambient temperature °C (°F) | −30 (−22) | 30 (86) | 45 (113) | 60 (140) |
|Engine coolant temperature at engine start − Intake air temperature 30 sec. after engine start| °C (°F) | 12 (21.6) | 12 (21.6) | 22 (39.6) | 22 (39.6) |
Time needed for diagnosis: Less than 1 second
Malfunction indicator light illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
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