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.
Refer to DTC P011011.
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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). |
| 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 values 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 store this DTC.
MONITOR STRATEGY
Related DTCs | P0117: Engine coolant temperature sensor range check (low voltage) |
Required Sensors/Components (Main) | Engine coolant temperature sensor |
Required Sensors/Components (Related) | - |
Frequency of Operation | Continuous |
Duration | 0.5 seconds |
MIL Operation | Immediate |
Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
Monitor runs whenever the following DTCs are not stored | None |
All of the following conditions are met | - |
Battery voltage | 8 V or higher |
Engine switch | On (IG) |
Starter | Off |
TYPICAL MALFUNCTION THRESHOLDS
Engine coolant temperature sensor voltage [Engine coolant temperature] | Less than 0.142 V [Higher than 135°C (275°F)] |
CONFIRMATION DRIVING PATTERN
HINT:
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HINT:
Techstream Display | Description |
---|---|
NORMAL |
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ABNORMAL |
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INCOMPLETE |
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HINT:
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
HINT:
PROCEDURE
1. | READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS) |
*1 | Engine Coolant Temperature Sensor |
*2 | ECM |
(a) Disconnect the engine coolant temperature sensor connector.
(b) Connect the Techstream to the DLC3.
(c) Turn the engine switch on (IG).
(d) Turn the Techstream on.
(e) Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.
Powertrain > Engine > Data List Tester Display |
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Coolant Temperature |
(f) According to the display on the Techstream, read the Data List.
OK:
Techstream Display | Specified Condition |
---|---|
Coolant Temperature | -40°C (-40°F) |
HINT:
Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.
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OK | REPLACE ENGINE COOLANT TEMPERATURE SENSOR |
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2. | CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) |
(a) Disconnect the engine coolant temperature sensor connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
C24-2 or C32-101 (THW) - Body ground and other terminals | Always | 10 kΩ or higher |
OK | REPLACE ECM |
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR |