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Home >> Jeep >> 2014 >> Wrangler Sahara, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 247 (3.6L - DTCS P000A To P0155) >> DTC Troubleshooting >> P0020-Bank 2 Camshaft 1 Position Actuator Circuit Open >> 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. CHECK FOR AN ACTIVE DTC 
    1. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
      WARNING:

      When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.

    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 THE (K78) VVT INTAKE SOLENOID 2/1 DRIVER CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the VVT Intake Solenoid 2/1 harness connector.
    3. Turn the ignition on.
    4. Measure the voltage on the (K78) VVT Intake Solenoid 2/1 Driver circuit at the VVT Intake Solenoid 2/1 harness connector.
      NOTE:

      There should be no voltage present unless you have a short to voltage, except for a brief period immediately after turning ignition on.

      Is there any voltage present?

      Yes 

      • Repair the (K78) VVT Intake Solenoid 2/1 Driver circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK THE (K78) VVT INTAKE SOLENOID 2/1 DRIVER CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
    3. Check for continuity between ground and the (K78) VVT Intake Solenoid 2/1 Driver circuit at the VVT Intake Solenoid 2/1 harness connector.

      Is there continuity between ground and the (K78) VVT Intake Solenoid 2/1 Driver circuit?

      Yes 

      • Repair the (K78) VVT Exhaust Solenoid 2/1 Driver circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE (K78) VVT INTAKE SOLENOID 2/1 DRIVER 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).
    2. Measure the resistance of the (K78) VVT Intake Solenoid 2/1 Driver circuit between the VVT Intake Solenoid 2/1 harness connector and the GPEC Adaptor.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  5

      No 

      • Repair the (K78) VVT Intake Solenoid 2/1 Driver circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. CHECK THE VVT INTAKE SOLENOID 2/1 GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance between ground and the VVT Intake Solenoid 2/1 Ground circuit at the VVT Intake Solenoid 1/1 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  6

      No 

      • Repair the VVT Intake Solenoid 2/1 Ground circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. CHECK THE (K78) VVT INTAKE SOLENOID 2/1 DRIVER CIRCUIT ACTUATION 
    1. Reconnect the PCM C2 harness connector with the GPEC Adaptor connected in-line.
    2. Reconnect the VVT Intake Solenoid 2/1 harness connector.
    3. Turn the ignition on.
    4. Measure the voltage on the (K78) VVT Intake Solenoid 2/1 Driver circuit at the GPEC Adaptor.
    5. With the scan tool, actuate the VVT Intake Solenoid 2/1 Control.
      NOTE:

      The VVT Solenoid Driver circuit is a 12 volt PWM circuit. With the solenoid connected the voltage reading will vary depending on the actuation percentage as follows:

      • 20% Duty Cycle will equate to approximately 1.5 - 2.0 volts.
      • 40% Duty Cycle will equate to approximately 3.75 - 4.25 volts.
      • 60% Duty Cycle will equate to approximately 6.25 - 6.75 volts.
      • 80% Duty Cycle will equate to approximately 8.5 - 9.0 volts.

      Is there voltage present and does it match approximately to the percentage selected?

      Yes 

      • Replace the VVT Intake Solenoid 2/1 in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  7
  7. 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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