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Home >> Jeep >> 2019 >> Renegade High Altitude, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1379 (1.3L - DTCS P0107 To P025C) >> DTC Troubleshooting >> P012C-Turbocharger/Supercharger Inlet Air Pressure Sensor 1 Circuit Low >> 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. READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR THE DTC TO RETURN 
    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, erase all DTCs.
    4. Turn the ignition off for a minimum of 10.0 seconds.
    5. Turn the ignition on.
    6. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
    7. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      • Go To  3

      No 

  3. CHECK FOR OTHER DTCS 
    1. Refer to the recorded DTCs.

      Are there any 5-Volt Supply circuit DTCs present?

      Yes 

      No 

      • Go To  4
  4. CHECK THE (F859) 5-VOLT SUPPLY CIRCUIT FOR PROPER VOLTAGE AT THE BOOST PRESSURE SENSOR HARNESS CONNECTOR 
    1. Turn the ignition off.
    2. Disconnect the Boost Pressure Sensor harness connector.
    3. Turn the ignition on.
    4. Measure the voltage of the (F859) 5-Volt Supply circuit at the Boost Pressure Sensor harness connector.
      NOTE:

      Normal operating voltage should be between 4.8 and 5.2 volts.

      Does the circuit have the proper voltage present?

      Yes 

      • Go To  7

      No 

      • Go To  5
  5. CHECK THE (F859) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
    3. Check for continuity between ground the (F859) 5-Volt Supply circuit at the Boost Pressure Sensor harness connector.

      Is there continuity between ground the (F859) 5-Volt Supply circuit?

      Yes 

      • Repair the (F859) 5-Volt Supply circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  6
  6. CHECK THE (F859) 5-VOLT SUPPLY CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    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 the GPEC Diagnostic Adaptor to perform the diagnosis.

    1. Connect the

      (special tool #10436, Adapter, GPEC Diagnostic)

      to the appropriate PCM connector.

      NOTE:

      The GPEC Diagnostic Adaptor can add up to 1.5 Ohms of resistance to the circuit.

    2. Measure the resistance of the (F859) 5-Volt Supply circuit between the Boost Pressure Sensor harness connector and the GPEC Diagnostic Adaptor.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  10

      No 

      • Repair the (F859) 5-Volt Supply circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  7. CHECK THE BOOST PRESSURE SENSOR (K37) PRESSURE SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Disconnect the PCM C1 harness connector.
    3. Check for continuity between ground the Boost Pressure Sensor (K37) Pressure Signal circuit at the Boost Pressure Sensor harness connector.

      Is there continuity between ground the Boost Pressure Sensor (K37) Pressure Signal circuit?

      Yes 

      • Repair the Boost Pressure Sensor (K37) Pressure Signal circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  8
  8. CHECK THE BOOST PRESSURE SENSOR (K37) PRESSURE SIGNAL CIRCUIT FOR A SHORT TO THE (K900) SENSOR GROUND CIRCUIT 
    1. Check for continuity between the Boost Pressure Sensor (K37) Pressure Signal circuit and the (K900) Sensor Ground circuit at the Boost Pressure Sensor harness connector.

      Is there continuity between the Boost Pressure Sensor (K37) Pressure Signal circuit and the (K900) Sensor Ground circuit?

      Yes 

      • Repair the Boost Pressure Sensor (K37) Pressure Signal circuit for a short the (K900) Sensor Ground circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  9
  9. CHECK THE ABILITY OF THE PCM TO READ THE BOOST PRESSURE SENSOR (K37) PRESSURE SIGNAL 
    1. Connect the PCM harness connectors.
    2. Connect a fused jumper between the (F855) 5-Volt Supply circuit and the Boost Pressure Sensor (K37) Pressure Signal circuit at the Boost Pressure Sensor harness connector.
    3. Turn the ignition on.
    4. With the scan tool, read DTCs.
      NOTE:

      The P012D-TURBOCHARGER/SUPERCHARGER INLET AIR PRESSURE SENSOR 1 CIRCUIT HIGH DTC should be active or pending with the jumper in place.

      Does the scan tool display as described above?

      Yes 

      No 

      • Go To  10
  10. 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 

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