Home Auto Repair 1999 Jeep Cherokee Limited DTC P0117: ECT SENSOR VOLTAGE TOO LOW

1999 Jeep Cherokee Limited DTC P0117: ECT SENSOR VOLTAGE TOO LOW

108
Download 1. Turn ignition on, with engine off. Using scan tool, read ECT sensor voltage. If voltage is less than .5 volt, go to next step. If voltage is .5 volt or more, go to step 6). 2. Turn ignition off. Disconnect ECT sensor connector. See Fig. 24 . Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using scan tool, read ECT sensor voltage. If voltage is more than 4 volts, replace ECT sensor. Perform TEST VER-5A. If voltage is 4 volts or less, go to next step. 3. Turn ignition off. Ensure ECT sensor connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance between ground and ECT sensor connector, signal circuit (Tan/Black wire). If resistance is less than 5 ohms, repair short to ground in signal circuit. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step. 4. Ensure ignition is off. Ensure ECT sensor and PCM connectors are still disconnected. Using ohmmeter, check resistance between ECT sensor connector, signal circuit (Tan/Black wire) and sensor ground circuit (Brown/Yellow wire).