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  • DTC 22 - ECT Sensor Voltage Too Low

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    Mopar1973Man

    DTC 22 - ECT Sensor Voltage Too Low - TEST FC-8A

    1. Using DRB-II, read Engine Coolant Temperature (ECT) sensor voltage. If voltage is less than .5 volt, go to step 3). If voltage is .5 volt or more, wiggle CTS connectors and harness while monitoring DRB-II. If voltage changed when harness and connectors were wiggled, repair harness or connector where wiggling caused voltage change. Perform TEST VER-1.
    2. If voltage did not change when harness and connectors were wiggled, condition required to set fault is not present at this time. ECT SENSOR VOLTAGE TOO LOW fault sets if coolant sensor circuit voltage at terminal No. 2 drops to less than .5 volt. Possible causes are sensor circuit shorted to ground and sensor shorted internally.
    3. Inspect wiring and connectors. Repair harness or connector as necessary. Perform TEST VER-1. If no problems were found with wiring and connectors, see INACTIVE FAULT CONDITION. Test is complete. Perform TEST VER-1.
    4. Disconnect ECT connector. Using DRB-II, read coolant temperature sensor voltage. If reading is more than 4 volts, replace ECT. Perform TEST VER-1. If reading is 4 volts or less, turn ignition off. Disconnect Powertrain Control Module (PCM). Using DRB-II in ohmmeter mode, probe ECT sensor connector, signal circuit (Tan/Black wire). If resistance is 5 ohms or more, replace PCM. Perform TEST VER-1. If resistance is less than 5 ohms, repair Tan/Black wire for a short to ground. Perform TEST VER-1.


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