SFI SYSTEM (w/ Secondary Air Injection System), Diagnostic DTC:P0116
| DTC Code | DTC Name |
|---|---|
| P0116 | Engine Coolant Temperature Circuit Range / Performance Problem |
DESCRIPTION
Refer to DTC P0115 Click here.
| DTC No. | DTC Detection Conditions | Trouble Areas |
|---|---|---|
| P0116 |
|
|
MONITOR DESCRIPTION
The ECT sensor is used to monitor the ECT. The ECT sensor has a built-in thermistor with a resistance that varies according to the temperature of the engine coolant. When the ECT is low, the resistance of the thermistor increases. When the temperature is high, the resistance drops. These variations in the resistance are reflected in the voltage output from the ECT sensor.
The ECM monitors the sensor voltage and uses this value to calculate the ECT. If the sensor voltage output deviates from the normal operating range, the ECM interprets this deviation as a malfunction in the ECT sensor and sets the DTC.
Examples:
Upon starting the engine, the ECT is between 35°C and 60°C (95°F and 140°F). If, after driving for 250 seconds, the ECT remains within +- 3°C (5.4°F) of the staring temperature, the DTC is set (2 trip detection logic).
WIRING DIAGRAM
Refer to DTC P0115 Click here.
INSPECTION PROCEDURE
Tech Tips
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If any of DTCs P0115, P0117, P0118 or P0125 are set simultaneously with DTC P0116, the ECT sensor may have an open or a short circuit. Troubleshoot those DTCs first.
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Read freeze frame data using an intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
PROCEDURE
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REPLACE ENGINE COOLANT TEMPERATURE SENSOR
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