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GPEC







P0116-ENGINE COOLANT TEMPERATURE SENSOR PERFORMANCE





For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
With engine off time greater than 480 minutes and ambient temperature greater than - 7° C (19.4° F).

- Set Condition:
After a calibrated amount of cool down time, the PCM compares the AAT, ECT, and IAT Sensor values. If one sensor value is not within 10° C (18° F) of the other temperature sensors for two consecutive trips, a DTC will set. Three good trips to turn off the MIL.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.Initial Inspection and Diagnostic Overview

Diagnostic Test

1. DTC IS ACTIVE

NOTE: Diagnose any CAN - C Communication DTCs before continuing.

Turn the ignition off.
If possible, allow the vehicle to sit with the ignition off for more than 480 minutes in an environment where the temperature is consistent and above - 7° C (19.4° F).
Test drive the vehicle. The vehicle must exceed 48 km/h (30 mph) during the test drive. Do not cycle the ignition off when the test drive is completed.
With a scan tool, select View DTCs.
Is the status Active or Pending for this DTC?

Yes

- Go to 3

No

- Go to 2

2. ENGINE COOLANT TEMPERATURE
Turn the ignition off.
Allow the vehicle to sit with the ignition off in an environment where the temperature is consistent and above - 7° C (19.4° F) until the engine coolant temperature is equal to ambient temperature.
Turn the ignition on.
With a scan tool, compare the AAT, ECT, and IAT sensor values.
Is the Engine Coolant Temperature Sensor 1 value within 10° C (18° F) of the other two sensor values?

Yes

- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.Checking For An Intermittent DTC

No

- Go to 3

3. (K2) ECT 1 SIGNAL CIRCUIT SHORTED TO VOLTAGE




Turn the ignition off.
Disconnect the Engine Coolant Temperature Sensor 1 connector.
Disconnect the Powertrain Control Module (PCM) connector.
Turn the ignition on.
Measure the voltage of the (K2) ECT 1 Signal circuit in the Engine Coolant Temperature Sensor 1 harness connector.
Is there any voltage present?

Yes

- Repair the (K2) ECT 1 Signal circuit for a short to voltage.
- Perform the PCM Verification Test Ver. 1Powertrain Verification Test.

No

- Go to 4

4. (K2) ECT 1 SIGNAL CIRCUIT SHORTED TO GROUND




Turn the ignition off.
Measure the resistance between ground and the (K2) ECT 1 Signal circuit in the Engine Coolant Temperature Sensor 1 harness connector.
Is the resistance above 100 ohms?

Yes

- Go to 5

No

- Repair the (K2) ECT 1 Signal circuit for a short to ground.
- Perform the PCM Verification Test Ver. 1Powertrain Verification Test.

5. (K2) ECT 1 SIGNAL CIRCUIT SHORTED TO (K900) SENSOR GROUND CIRCUIT




Measure the resistance between the (K2) ECT 1 Signal circuit and the (K900) Sensor Ground circuit in the Engine Coolant Temperature Sensor 1 harness connector.
Is the resistance above 100 ohms?

Yes

- Go to 6

No

- Repair the (K2) ECT 1 Signal circuit for a short to the (K900) Sensor Ground circuit.
- Perform the PCM Verification Test Ver. 1Powertrain Verification Test.

6. (K2) ECT 1 SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE




NOTE: When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.

Measure the resistance of the (K2) ECT 1 Signal circuit between the Engine Coolant Temperature Sensor 1 harness connector and the Powertrain Control Module (PCM) harness connector.
Is the resistance below 5.0 ohms?

Yes

- Go to 7

No

- Repair the (K2) ECT 1 Signal circuit for an open circuit or high resistance.
- Perform the PCM Verification Test Ver. 1Powertrain Verification Test.

7. (K900) SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE




NOTE: When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.

Measure the resistance of the (K900) Sensor Ground circuit between the Engine Coolant Temperature Sensor 1 harness connector and the Powertrain Control Module (PCM) harness connector.
Is the resistance below 5.0 ohms?

Yes

- Go to 8

No

- Repair the (K900) Sensor Ground for an open circuit or high resistance.
- Perform the PCM Verification Test Ver. 1Powertrain Verification Test.

8. ENGINE COOLANT TEMPERATURE SENSOR 1 SIGNAL VOLTAGE




Turn the ignition off.
Connect the Powertrain Control Module (PCM) connector.
Connect a jumper wire between the (K900) Sensor Ground circuit and the (K2) ECT 1 Signal circuit in the Engine Coolant Temperature Sensor 1 harness connector.
Turn the ignition on.
With the scan tool, read the Engine Coolant Temperature Sensor 1 signal voltage.
Is the voltage below 1.0 volt with the jumper wire in place?

Yes

- Go to 9

No

- Go to 10

9. ENGINE COOLANT TEMPERATURE SENSOR 1
Turn the ignition off.
Inspect the wiring and connectors between the Engine Coolant Temperature Sensor 1 and the Powertrain Control Module (PCM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related connectors.
Were any problems found?

Yes

- Repair as necessary.
- Perform the PCM Verification Test Ver. 1Powertrain Verification Test.

No

- Replace the Engine Coolant Temperature Sensor 1.
- Perform the PCM Verification Test Ver. 1Powertrain Verification Test.

10. POWERTRAIN CONTROL MODULE (PCM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Engine Coolant Temperature Sensor 1 and the Powertrain Control Module (PCM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
Look for the data to change or for the DTC to reset during the wiggle test.
Search for any Technical Service Bulletins that may apply.
Were any problems found?

Yes

- Repair as necessary.
- Perform the PCM Verification Test Ver. 1Powertrain Verification Test.

No

- Replace and program the Powertrain Control Module (PCM).
- Perform the PCM Verification Test Ver. 1Powertrain Verification Test.

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