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Home >> Dodge and Ram >> 2020 >> Durango R/T, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (3.6L - DTCS P0073 To P0222) >> DTC Troubleshooting >> P0112-Intake Air Temperature Sensor 1 Circuit Low >> Diagnostic Test

Diagnostic Test

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  1. CHECK FOR AN ACTIVE DTC 
    1. Turn the ignition on.
    2. With the scan tool, read DTCs and record on the repair order.

      Is the DTC active or pending?

      Yes 

      • Go To  2

      No 

  2. CHECK FOR 5-VOLT REFERENCE DTCS 
    NOTE:

    Although two-wire sensors do not use the 5-Volt Reference circuit directly, some PCMs use a common source to power the 5-Volt Reference circuit and the two-wire sensors. If the 5-Volt Reference circuit is shut down by the PCM internally for protection due to a short, it can cause faults to set against some two-wire sensors.

    1. Refer to the recorded DTCs.

      Are there any 5-Volt Reference DTCs present?

      Yes 

      No 

      • Go To  3
  3. CHECK THE IAT SENSOR FOR PROPER OPERATION 
    1. Turn the ignition off.
    2. Disconnect the IAT Sensor harness connector.
    3. Turn the ignition on.
    4. With the scan tool, read DTCs and record on the repair order.
      NOTE:

      The P0113-INTAKE AIR TEMPERATURE SENSOR 1 CIRCUIT HIGH DTC should display as active or pending with the connector disconnected.

      Does the scan tool display as described above?

      Yes 

      • Verify that there is good pin to terminal contact in the Intake Air Temperature Sensor and Powertrain Control Module connectors. Replace the Intake Air Temperature Sensor if no problems were found in the connectors.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE (K21) IAT SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Disconnect the IAT Sensor harness connector.
    3. Disconnect the PCM C2 harness connector.
    4. Check for continuity between ground and the (K21) IAT Signal circuit at the Intake Air Temperature Sensor harness connector.

      Is there continuity between ground and the (K21) IAT Signal circuit?

      Yes 

      • Repair the (K21) IAT Signal circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  5
  5. CHECK THE (K21) IAT SIGNAL CIRCUIT FOR A SHORT TO THE (K915) SENSOR GROUND CIRCUIT 
    1. Check for continuity between the (K21) IAT Signal circuit and the (K915) Sensor Ground circuit at the IAT Sensor harness connector.

      Is there continuity between the (K21) IAT Signal circuit and the (K915) Sensor Ground circuit?

      Yes 

      • Repair the (K21) IAT Signal circuit for a short to the (K915) Sensor Ground circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  6
  6. CHECK RELATED HARNESS CONNECTIONS 
    1. Disconnect all PCM harness connectors.
    2. Disconnect all related in-line harness connections (if equipped).
    3. Disconnect the related component harness connectors.
    4. 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.

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

      Did the DTC return?

      Yes 

      No 

      • The wiring or poor connection problem has been repaired.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
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