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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 >> P012D-Turbocharger/Supercharger Inlet Air Pressure Sensor 1 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. READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR 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 THE (F859) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE 
    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:

      The voltage on a 5.0 volt signal or reference circuit should be between approximately 4.8 and 5.2 volts.

      Is the voltage above 5.2 volts?

      Yes 

      • Go To  4

      No 

      • Go To  5
  4. CHECK THE (F859) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT AT THE PCM HARNESS CONNECTOR 
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
      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.

    3. Connect the (special tool #10436, Adapter, GPEC Diagnostic) to the appropriate PCM connector.
    4. Check for continuity between the (F859) 5-Volt Supply and all other circuits in the PCM C2 connector at the GPEC adapter.
      NOTE:

      With the circuit isolated there should be no continuity between the circuit being tested and any other circuit.

      Is there continuity between the (F859) 5-Volt Supply circuit and any other circuit?

      Yes 

      • Repair the short between the circuits that have continuity. Use the wiring diagram as a guide to trace the circuits and look for any in-line connectors to help isolate the location of the short.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  9
  5. CHECK THE BOOST PRESSURE SENSOR (K37) PRESSURE SIGNAL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT AT THE PCM HARNESS CONNECTOR 
    1. Turn the ignition off.
    2. Disconnect the PCM C1 and C2 harness connectors.
      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.

    3. Connect the (special tool #10436, Adapter, GPEC Diagnostic) to the appropriate PCM connector.
    4. Check for continuity between the Boost Pressure Sensor (K37) Pressure Signal circuit and all other circuits in the PCM C1 and C2 connectors at the GPEC Diagnostic Adapter.
      NOTE:

      With the circuit isolated there should be no continuity between the circuit being tested and any other circuit.

      Is there continuity between the Boost Pressure Sensor (K37) Pressure Signal circuit and any other circuit?

      Yes 

      • Repair the short between the circuits that have continuity. Use the wiring diagram as a guide to trace the circuits and look for any in-line connectors to help isolate the location of the short.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  6
  6. CHECK THE BOOST PRESSURE SENSOR (K37) PRESSURE SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the Boost Pressure Sensor (K37) Pressure Signal circuit between the Boost Pressure Sensor harness connector and the GPEC Diagnostic Adapter.
      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.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  7

      No 

  7. CHECK THE (K900) SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (K900) Sensor Ground circuit between the Boost Pressure Sensor harness connector and the GPEC Diagnostic Adapter.
      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.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  8

      No 

  8. CONNECT A FUSED JUMPER BETWEEN THE (K900) SENSOR GROUND CIRCUIT AND THE BOOST PRESSURE SENSOR (K37) PRESSURE SIGNAL CIRCUIT AT THE BOOST PRESSURE SENSOR HARNESS CONNECTOR - VERIFY ABILITY OF THE PCM TO DETECT THE SENSOR SIGNAL CIRCUIT LOW DTC 
    1. Remove the GPEC Diagnostic Adapter and re-connect the PCM harness connectors.
    2. Disconnect the sensor harness connector.
    3. With the ignition in the off position, connect a fused jumper between the Boost Pressure Sensor (K37) Pressure Signal circuit and the (K900) Sensor Ground circuit at the sensor harness connector.
    4. Turn the ignition on.
    5. With the scan tool, read DTCs.

      Does the scan tool display the P012C-TURBOCHARGER-SUPERCHARGER INLET AIR PRESSURE SENSOR 1 CIRCUIT LOW with the jumper in place?

      Yes 

      No 

      • Go To  9
  9. 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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