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Home >> Jeep >> 2014 >> Wrangler Sahara, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 245 (3.6L - DTCS P0653 To P2128) >> DTC Troubleshooting >> P1115-General Temperature Rationality >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2016 Jeep Wrangler and 2015 Jeep Wrangler. However, it is still accessible from the selected car via links, so may be relevant.
  1. TEMPERATURE SENSOR COMPARISON 
    NOTE:

    All ECT, Intake Air and Ambient Air Temperature Sensor codes must be diagnosed and repaired before continuing.

    NOTE:

    In cold weather, this DTC could be set by a high powered block heater and no repair would be required.

    1. Turn the ignition off.
    2. If possible, allow the vehicle to sit with the ignition off for more than 480 minutes in an environment where the temperature is consistent and above -64°C (-83°F).
    3. Turn the ignition on.
    4. With the scan tool, read the ECT, Ambient Air Temperature and Intake Air Temperature Sensor values.

      Are the temperature readings within 15°C (59°F) of each other?

      Yes 

      No 

      • Go To  2
  2. TEMPERATURE SENSOR 
    1. Disconnect the suspected sensor.
    2. With the scan tool, read the voltage of the suspected sensor.
    3. Connect a jumper between the Sensor Signal circuit and the Sensor ground circuit of the suspected sensor.

      Did the voltage reading start at 4.8 to 5.0 volts and decrease to 0 volts when the jumper was installed?

      Yes 

      • Verify that there is good pin to terminal contact in the Sensor and Control Module connectors. If no problems are found, replace the appropriate Temperature Sensor.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  3
        NOTE:

        Remove the jumper before continuing.

  3. CHECK FOR HIGH RESISTANCE IN THE TEMPERATURE SENSOR SIGNAL CIRCUIT 
    1. Turn the ignition off.
    2. Disconnect the appropriate PCM harness connector.
    3. Disconnect the appropriate BCM harness connector.
    4. Measure the resistance of the suspect Sensor Signal circuit between the Sensor harness connector and the appropriate terminal of PCM harness connector or BCM harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  4

      No 

      • Repair the excessive resistance in the Temperature Sensor Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  4. CHECK FOR HIGH RESISTANCE IN THE SENSOR GROUND CIRCUIT 
    1. Measure the resistance of the Sensor ground circuit between the Sensor harness connector and the appropriate terminal of PCM harness connector or BCM harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  5

      No 

      • Repair the Sensor ground circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. CHECK THE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    1. Check for continuity between ground and the Sensor Signal circuit at the Sensor harness connector.

      Is there continuity between ground and the Sensor Signal circuit?

      Yes 

      No 

      • Go To  6
  6. CHECK FOR THE SENSOR SIGNAL CIRCUIT SHORTED TO THE SENSOR GROUND CIRCUIT 
    1. Check for continuity between the Sensor Ground and the Sensor Signal circuit at the Sensor harness connector.

      Is there continuity between the Sensor Ground and the Sensor Signal circuit?

      Yes 

      • Repair the short between the Sensor Ground circuit and the Sensor Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  7
  7. SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    1. Turn the ignition on.
    2. Measure the voltage on the Sensor Signal circuit at the Sensor harness connector.

      Is there any voltage present?

      Yes 

      • Repair the Sensor Signal circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  8
  8. CHECK RELATED PCM AND COMPONENT CONNECTIONS 
    1. Perform any Service Bulletins that apply.
    2. Disconnect all PCM harness connectors.
    3. Disconnect all related in-line harness connections (if equipped).
    4. Disconnect the related component harness connectors.
    5. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Check for spread terminals and verify proper terminal tension.

      Repair any conditions that are found.

    6. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    9. With the scan tool, erase DTCs.
    10. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
    11. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      No 

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