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DTC P1115: General Temp Sensor Performance: Testing

NOTE: Due to the fact that the PCM compares the Intake Air Temperature (IAT), Ambient Air Temperature (AAT) and Engine Coolant Temperature (ECT) sensors to see if they are within a calibrated temperature of one another, the use of a block heater can cause false readings for the PCM. Check with the customer to see if they use a block heater.
NOTE: It is possible that more then one temperature sensor caused this DTC to set. After a repair has been made the remaining temperature sensors must be checked using the DRB temperature probe.
  1. Ignition on, engine not running. With the DRBIII® scan tool, read DTCs and record the related freeze frame data. Is the Good Trip displayed and equal to zero? If yes, go to next step. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn the ignition on. With the DRBIII® scan tool, read and record the AAT sensor temperature value. Using the DRB temperature probe (CH7050), measure the ambient air temperature near the AAT sensor. Is the AAT sensor value within 5°F (-15°C) of the temperature probe reading? If yes, go to next step. If no, go to step  6.
  3. Turn the ignition on. With the DRBIII® scan tool, read and record the IAT sensor temperature value. Remove the IAT sensor. Using the DRB temperature probe (CH7050), measure the temperature inside the IAT sensor opening. Is the IAT sensor value within 5°F (-15°C) of the temperature probe reading? If yes, go to next step. If no, go to step  6.
    4. WARNING: Make sure the engine cooling system is cool before removing the pressure cap or any hose. Severe personal injury may result from escaping hot coolant. The cooling system is pressurized when hot.
  4. Turn the ignition on. With the DRBIII® scan tool, read and record the ECT sensor temperature value. Using the DRBIII® scan tool temperature probe (CH7050), measure the engine coolant temperature. Is the ECT sensor value within 5°F (-15°C) of the temperature probe reading? If yes, go to next step. If no, go to step  6.
    5. WARNING: When the engine is operating, do not stand in a direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing.
    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. Inspect the temperature sensors for any physical damage. Inspect the engine coolant. Ensure the coolant is at the proper level. Ensure the temperature sensors are properly mounted. Refer to any Technical Service Bulletins (TSBs) that may apply. With the engine running at normal operating temperature, monitor the temperature sensor parameters while wiggling the wire harness. Look for parameter values to change. Visually inspect the related wire harness. Look for any chafed, pierced, pinched, partially broken wires and broken, bent, pushed out, or corroded terminals. Inspect and clean all PCM, engine, and chassis grounds. Were any problems found during the above inspections? If yes, repair as necessary. If no, test complete.
  6. Turn the ignition off. Visually inspect both the component and the PCM connectors. Look for damage, partially broken wires and backed out or corroded terminals. Disconnect the applicable temperature sensor harness connector. Ignition on, engine not running. Measure the voltage of the signal circuit in the applicable temperature sensor harness connector. Is the voltage above 5.2 volts? If yes, repair the short to battery voltage in the signal circuit. If no, go to next step.
  7. Turn the ignition off. Disconnect the applicable temperature sensor harness connector. Ignition on, engine not running. With the DRBIII® scan tool, read the temperature sensor voltage. Is the voltage above 4.6 volts? If yes, go to next step. If no, go to step  11.
  8. Turn the ignition off. Disconnect the applicable temperature sensor harness connector. Using a jumper wire, jumper across the temperature sensor harness connector. Ignition on, engine not running. With the DRBIII® scan tool, read the temperature voltage. Is the voltage below 1.0 volt? If yes, replace the applicable temperature sensor. If no, go to next step.
    9. 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.
  9. Turn the ignition off. Disconnect the applicable temperature sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the signal circuit from the temperature sensor harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open in the signal circuit.
    10. 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.
  10. Turn the ignition off. Disconnect the applicable temperature sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the sensor ground circuit from the AAT sensor harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Replace and program the Powertrain Control Module. See PROGRAMMING . If no, repair the open in the sensor ground circuit.
  11. Turn the ignition off. Disconnect the applicable temperature sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance between ground and the signal circuit in the temperature harness connector. Is the resistance below 100 ohms? If yes, repair the short to ground in the signal circuit. If no, go to next step.
  12. Turn the ignition off. Disconnect the applicable temperature sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance between the signal circuit and the sensor ground circuit in the temperature sensor harness connector. Is the resistance below 100 ohms? If yes, repair the sensor ground shorted to the signal circuit. If no, before continuing disconnect the PCM harness connector and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary. 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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