Diagnostic Procedure
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
P0116-ENGINE COOLANT TEMPERATURE CIRCUIT PERFORMANCE DIAGNOSTIC TEST REFERENCE
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 | Ignition on, engine not running. With the DRBIII®, read DTCs and record the related Freeze Frame data. Is the Good Trip Counter displayed and equal to zero? Yes --> Go To 2 No --> Refer to the INTERMITTENT CONDITION SYMPTOM . Perform POWERTRAIN VERIFICATION TEST VER - 5 . |
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| 2 | Turn the ignition off. Disconnect the C2 PCM harness connector. Disconnect the ECT Sensor harness connector.
NOTE:
Visually inspect both the component and the PCM connectors. Look for damaged, partially broken wires, and backed out or corroded terminals. Ignition on, engine not running. Measure the voltage on the (K2) ECT Signal circuit at the ECT Sensor harness connector. Is the voltage above 5.2 volts? Yes --> Repair the short to voltage in the (K2) ECT Signal circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 . No --> Go To 3 |
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| 3 | Turn the ignition off. Connect the C2 PCM harness connector. Ignition on, engine not running. With the DRBIII®, read the ECT Sensor voltage. Is the voltage above 4.6 volts? Yes --> Go To 4 No --> Go To 7 |
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| 4 | Connect a jumper wire between the (K2) ECT Signal circuit and the (K900) Sensor ground circuit at the ECT Sensor harness connector. With the DRBIII®, read the ECT voltage. Is the voltage below 1.0 volt? Yes --> Replace the ECT Sensor. Perform POWERTRAIN VERIFICATION TEST VER - 5 . No --> Go To 5 |
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| 5 | Turn the ignition off. Disconnect the C2 PCM harness connector.
CAUTION:
DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS. Measure the resistance of the (K2) ECT Signal circuit from the ECT Sensor harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes --> Go To 6 No --> Repair the open in the (K2) ECT Signal circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 . |
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| 6 |
CAUTION:
DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS. Measure the resistance of the (K900) Sensor ground circuit from the ECT Sensor harness connector to the appropriate terminal of special tool #8815.Is the resistance below 5.0 ohms?Yes --> Go To 9No --> Repair the open in the (K900) Sensor ground circuit.Perform POWERTRAIN VERIFICATION TEST VER - 5 . |
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| 7 | Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance between ground and the (K2) ECT Signal circuit at the ECT Sensor harness connector. Is the resistance below 100 ohms? Yes --> Repair the short to ground in the (K2) ECT Signal circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 . No --> Go To 8 |
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| 8 | Measure the resistance between the (K2) ECT Signal circuit and the (K900) Sensor ground circuit at the ECT Sensor harness connector. Is the resistance below 5.0 ohms? Yes --> Repair the short between the (K900) Sensor ground and the (K2) ECT Signal circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 . No --> Go To 9 |
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| 9 |
NOTE:
Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.If there are no possible causes remaining, view repair.RepairReplace and program the Powertrain Control Module per Service Information.Perform POWERTRAIN VERIFICATION TEST VER - 5 . |
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