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.
P0117-ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT LOW DIAGNOSTIC TEST REFERENCE
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 | Ignition on, engine not running. With the DRBIII®, read the ECT Sensor voltage. Is the voltage below 0.5 of a volt? 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 ECT harness connector. Ignition on, engine not running. With the DRBIII®, read ECT Sensor voltage. Is the voltage above 1.0 volt? Yes --> Replace the ECT Sensor. Perform POWERTRAIN VERIFICATION TEST VER - 5 . No --> Go To 3 |
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| 3 | 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 4 |
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| 4 | 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 100 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 5 |
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| 5 |
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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