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Test K: Engine Coolant Temperature (ECT) Sensor

PINPOINT TEST K: ENGINE COOLANT TEMPERATURE (ECT) SENSOR


Flow Chart:






This pinpoint test is intended to diagnose the following:
- ECT sensor (12A648)
- harness circuits: ECT and SIGRTN
- powertrain control module (PCM) (12A650)


Temperature Vs. Resistance Values (Approximate):






Engine Coolant Temperature Sensor Connector


Engine Coolant Temperature Sensor Connector:






PCM Connector


PCM Connector:





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K1 : PRELIMINARY DIAGNOSIS FOR DIAGNOSTIC TROUBLE CODES (DTCS) P0116, P0117, P0118 OR P0126

- Carry out a visual inspection.
- Check coolant level and quality.
- Retrieve and record all DTCs.
- Record the freeze frame data.
- Clear all the DTCs
- Carry out the KOEO self-test. Quick Test Description
- Are DTCs P0116, P0117, P0118 or P0126 present?






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K2 : DTC P0117: SIMULATE AN OPPOSITE SIGNAL TO THE PCM

- Possible causes:
- ECT signal circuit ground short
- ECT sensor
- PCM

- Ignition OFF.
- ECT Sensor connector disconnected.
- The ECT sensor is disconnected to simulate the opposite DTC.
- Ignition ON, engine OFF.
- Carry out the KOEO self-test. Quick Test Description
- Is DTC P0118 present?






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K3 : CHECK THE ECT SIGNAL CIRCUIT FOR A SHORT TO GROUND

- Ignition OFF.
- PCM connector disconnected.
- Measure the resistance between:







- Is the resistance greater than 10,000 ohms?






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K4 : DTC P0118: SIMULATE AN OPPOSITE SIGNAL TO THE PCM

- Possible causes:
- ECT signal circuit open or short to voltage
- signal return circuit open
- ECT sensor
- PCM

- ECT Sensor connector disconnected.
- The ECT sensor is disconnected to simulate the opposite DTC.
- Ignition OFF.
- Connect a 5 amp fused jumper wire between the following:







- Ignition ON, engine OFF.
- Carry out the KOEO self-test. Quick Test Description
- Is DTC P0117 present?






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K5 : CHECK THE ECT SIGNAL CIRCUIT FOR AN OPEN

- Ignition OFF.
- PCM connector disconnected.
- Measure the resistance between:







- Is the resistance less then 5 ohms?






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K6 : CHECK THE ECT SIGNAL RETURN CIRCUIT FOR AN OPEN

- Measure the resistance between:







- Is the resistance less then 5 ohms?






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K7 : CHECK THE ECT SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

- Ignition ON, engine OFF.
- Measure the voltage between:







- Is any voltage present?






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K8 : DTC P0116: INSPECT THE ECT SENSOR CIRCUITRY

NOTE: Refer to DTC Index, Diagnostic Trouble Code (DTC) Charts and Descriptions for possible causes and additional DTC description information. Testing and Inspection

- Check coolant level and quality.
- Inspect the ECT sensor circuitry at the sensor and PCM. Inspect for damaged, loose or pushed-out pins, and loose or poorly crimped wires.
- Is a concern present?





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K9 : CHECK FOR DTCS

- Carry out the KOEO self-test. Quick Test Description
- Are other DTCs present?






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K10 : CHECK THE ECT SENSOR OPERATION

NOTE: Verify no accessories are in use (engine block or oil heaters)

- Clear all the DTCs.
- Cold soak the vehicle at ambient temperature for at least 10 hours.
- Ignition ON, engine OFF.
- Access the PCM and monitor the ECT PID.
- Access the PCM and monitor the RPM PID.
- Access the PCM and monitor the MFDES PID.
- Record the ECT sensor temperature value.
- Drive the vehicle at an engine speed greater than 1,000 RPM and 15 mg/stroke MFDES for at least 15 minutes. Select the appropriate gear to achieve the operating conditions.
- Does the ECT temperature value change by at least 6°C (10°F)?






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K11 : CHECK THE COOLING SYSTEM

NOTE: Verify the heater (both front and rear if equipped) are not in use.

- Drive the vehicle an additional 15 minutes at an engine speed greater than 1,800 RPM and 15 mg/stroke MFDES. Select the appropriate gear to achieve the operating conditions.
- Does the ECT temperature reading increase above 70°C (158°F)?






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K12 : CHECK THE PCM FOR DTCS

- Ignition ON, engine OFF.
- Retrieve the continuous memory DTCs.
- Is DTC P0116 present?






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K13 : DTC P0126: INSPECT THE ECT SENSOR CIRCUITRY

NOTE: Refer to DTC Index, Diagnostic Trouble Code (DTC) Charts and Descriptions for possible causes and additional DTC description information. Testing and Inspection

- Inspect the ECT sensor circuitry at the sensor and PCM. Inspect for damaged, loose or pushed-out pins, and loose or poorly crimped wires.
- Is a concern present?






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K14 : CHECK THE COOLING SYSTEM

- Check coolant level and quality.
- Check the radiator for correct operation. Verify there are no airflow obstructions across the radiator core and that the radiator core is not plugged.
- Verify the correct cooling fan clutch operation.
- Verify the correct thermostat operation.
- Is a concern present?






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K15 : CHECK FOR DTCS

- Carry out the KOEO self-test. Quick Test Description
- Are other DTCs present?






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K16 : CHECK THE ECT SENSOR OPERATION

NOTE: Verify no accessories are in use (engine block or oil heaters)

- Clear the continuous memory DTCs.
- Cold soak the vehicle at ambient temperature for at least 8 hours.
- Ignition ON, engine OFF.
- Access the PCM and monitor the ECT PID.
- Is the ECT sensor PID equal to ambient temperature?






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K17 : CONFIRM THE PCM CONCERN

- Operate the engine for approximately 15 to 20 minutes.
- Retrieve the continuous memory DTCs.
- Is DTC P0126 present?






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K18 : CHECK FOR CORRECT PCM OPERATION

- Disconnect all the PCM connectors.
- Visually inspect for:
- pushed out pins
- corrosion

- Connect all the PCM connectors and make sure they seat correctly.
- Carry out the PCM self-test and verify the concern is still present.
- Is the concern still present?





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