7GR-FKS ENGINE CONTROL SFI SYSTEM P011511 Engine Coolant Temperature Sensor 1 Circuit Short to Ground
DESCRIPTION
A thermistor, whose resistance value varies according to the engine coolant temperature, is built into the engine coolant temperature sensor. The structure of the sensor and its connection to the ECM are the same as those of the intake air temperature sensor.
- HINT:
-
When DTC P011511 is stored, the ECM enters fail-safe mode. During fail-safe mode, the engine coolant temperature is estimated to be 80°C (176°F) by the ECM. Fail-safe mode continues until a pass condition is detected.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P011511 | Engine Coolant Temperature Sensor 1 Circuit Short to Ground | The engine coolant temperature sensor output voltage is less than 0.142 V for 0.5 seconds or more (1 trip detection logic). | ·
Short in engine coolant temperature sensor circuit ·
Engine coolant temperature sensor ·
ECM |
Comes on | DTC stored | SAE Code: P0117 |
- HINT:
-
When this DTC is output, check the engine coolant temperature in the Data List. Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.
DTC No. Coolant Temperature Malfunction P011511 Higher than 135°C (275°F) Short to ground in THW circuit
-
If the Data List value is normal it may be due to a temporary recovery from the malfunction condition. Check for intermittent problems.
MONITOR DESCRIPTION
The engine coolant temperature sensor is used to monitor the engine coolant temperature. The engine coolant temperature sensor has a thermistor with a resistance that varies according to the temperature of the engine coolant. When the coolant temperature is low, the resistance in the thermistor increases. When the temperature is high, the resistance drops. These variations in resistance are reflected in the output voltage from the sensor. The ECM monitors the sensor voltage and uses this value to calculate the engine coolant temperature. If the engine coolant temperature sensor output voltage deviates from the normal operating range, the ECM interprets this as a fault in the engine coolant temperature sensor circuit and stores this DTC.
Example:
If the engine coolant temperature sensor output voltage is less than 0.142 V for 0.5 seconds or more, the ECM stores this DTC.
MONITOR STRATEGY
| Frequency of Operation | Continuous |
CONFIRMATION DRIVING PATTERN
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON.
Turn the GTS on.
Wait 0.5 seconds or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
- HINT:
- ·
If a pending DTC is output, the system is malfunctioning.
·If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P011511.
Check the DTC judgment result.
| GTS Display | Description |
|---|---|
| NORMAL | ·
DTC judgment completed ·
System normal |
| ABNORMAL | ·
DTC judgment completed ·
System abnormal |
| INCOMPLETE | ·
DTC judgment not completed ·
Perform driving pattern after confirming DTC enabling conditions |
- HINT:
- ·
If the judgment result is NORMAL, the system is normal.
·If the judgment result is ABNORMAL, the system is malfunctioning.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
- HINT:
- ·
If DTC P011511 is stored, check that the engine does not overheat (the DTC P011511 may be stored due to engine overheating).
·Read Freeze Frame Data using the GTS. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
PROCEDURE
| *1 | Engine Coolant Temperature Sensor |
| *2 | ECM |
Disconnect the engine coolant temperature sensor connector.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.
- Powertrain > Engine > Data List
-
Tester Display Coolant Temperature - 50003 372 205
According to the display on the GTS, read the Data List.
- OK:
GTS Display Specified Condition Coolant Temperature -40°C (-40°F)
- HINT:
-
Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.
- Result:
Proceed to OK NG
OK
NG
Disconnect the engine coolant temperature sensor connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition E61-2 or E1-24 (THW) - Body ground and other terminals Always 10 kΩ or higher
- Result:
Proceed to OK NG
OK
NG