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Home >> Jeep >> 2019 >> Renegade High Altitude, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1378 (1.3L - DTCS B1810 To P0106) >> DTC Troubleshooting >> P0073-Ambient Air Temperature Sensor Circuit High >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2020 Jeep Renegade. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR ANY SERVICE BULLETINS OR PCM SOFTWARE UPDATES 
    1. Check for any applicable Service Bulletins or Flash updates related to the DTC.

      Are there any applicable Service Bulletins or Flash updates?

      Yes 

      No 

      • Go To  2
  2. CHECK FOR OTHER DTCS 
    1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
    2. For future reference, with the scan tool, run and save a vehicle Scan Report and all related recorded data.
    3. With the scan tool, read DTCs.

      Are there any CAN Bus, system charging or battery voltage DTCs present?

      Yes 

      No 

      • Go To  3
  3. CHECK FOR AN ACTIVE DTC 
    1. With the scan tool, erase all DTCs.
    2. Turn the ignition off for a minimum of 10.0 seconds.
    3. Turn the ignition on.
    4. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
    5. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      • Go To  4

      No 

  4. CHECK THE (G31) AAT SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the Outside Passenger Review Mirror C1 harness connector.
    3. Turn the ignition on.
    4. Measure the voltage on the (G31) AAT Signal circuit in the Passenger Side Door Mirror C1 harness connector.

      Is the voltage above 5.2 volts?

      Yes 

      • Repair the (G31) AAT Signal circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  5
  5. CHECK THE (G31) AAT SIGNAL FOR AN OPEN/HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Disconnect the BCM C6 harness connector.
    3. Measure the resistance of the (G31) AAT Signal circuit between the Passenger Side Door Mirror C1 harness connector and the BCM C6 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  6

      No 

      • Repair the (G31) AAT Signal circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. CHECK THE (G931) SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (G931) Sensor Ground circuit between the Passenger Side Door Mirror C1 harness connector and the BCM C6 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  7

      No 

      • Repair the (G931) Sensor Ground circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  7. CHECK THE ABILITY OF THE BCM TO READ THE AMBIENT AIR TEMPERATURE SENSOR SIGNAL 
    1. Turn the ignition off.
    2. Reconnect the BCM C6 harness connector.
    3. Connect a jumper between the (G31) AAT Signal circuit and the (G931) Sensor Ground circuit in the Passenger Side Door Mirror C1 harness connector.
    4. Turn the ignition on.
    5. With the scan tool, read DTCs.
      NOTE:

      The P0072-AMBIENT AIR TEMPERATURE SENSOR LOW DTC should be active or pending with the jumper in place.

      Does the scan tool display as described above?

      Yes 

      • Replace the Ambient Air Temperature (AAT) Sensor in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  8
  8. CHECK RELATED BCM AND COMPONENT CONNECTIONS 
    1. Disconnect all BCM 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.
      • Perform a terminal drag test on each connector terminal to verify proper terminal tension.

      Repair any conditions that are found.

    5. Reconnect all BCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    7. Reconnect 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 

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