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DTC P1115: General Temperature Sensor Performance: Testing

WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: All ECT, Intake Air, and Ambient Air Temperature Sensor codes must be diagnosed and repaired before continuing.
  1. Ignition on, engine not running. With the DRBIII® scan tool, read the DTCs and record the related freeze frame data. Is the Good Trip Counter displayed and equal to zero. If yes, go to next step. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. With the DRBIII® scan tool in sensors, read the ECT, ambient/battery temp, and intake air temp sensor temp values. Start the engine. Allow the engine to reach normal operating temperature while monitoring the three sensor temperature values. Is the temperature for each of the sensors increasing properly? If yes, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM. If no, go to next step.
  3. Ignition on, engine not running. Disconnect the suspected faulty sensor. Connect a jumper wire between the sensor signal circuit and the (K4) sensor ground circuit. With the DRBIII® scan tool in sensors, read the voltage of the suspected sensor. Did the voltage reading start at 4.8-5.0 volts and decrease to 0 volts? If yes, replace the faulty sensor. If no, go to next step.
    4. 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.
  4. Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance of the sensor signal circuit from the sensor harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance above 5.0 ohms. If yes, repair the excessive resistance in the sensor signal circuit. If no, go to next step.
    5. 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.
  5. Measure the resistance of the (K4) sensor ground circuit from the sensor harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance above 5.0 ohms. If yes, repair the excessive resistance in the (K4) sensor ground circuit. If no, go to next step.
    6. NOTE: Before continuing, disconnect the PCM harness connectors and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary.
  6. Using the wiring diagram as a guide, inspect the wire harness and connectors. Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect both the component and the PCM connectors. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
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