LEMON Manuals: Even more car manuals for everyone
Home >> Dodge and Ram >> 2023 >> Durango GT, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 38 (6.2L - DTCS P1620 To P2107) >> DTC Troubleshooting >> P1627-Supercharger Bypass Valve Position Sensor 1/2 Correlation >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FOR AN ACTIVE DTC 
    NOTE:

    If there are any SCB Valve Position Sensor 1 or 2 circuit faults present, diagnose and repair those faults before proceeding with this test procedure.

    NOTE:

    Make sure the SCB Valve plate is at the idle position and free from binding and carbon build up.

    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 HIGH RESISTANCE IN THE (K871) SCB VALVE SIGNAL 1 CIRCUIT 
    1. Turn the ignition off.
      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.

    2. Disconnect the PCM C2 harness connector and connect the (special tool #10436, Adapter, GPEC Diagnostic) in-line with the PCM C2 harness connector.
    3. Using a voltmeter, perform a voltage drop test. Back probe connect the voltmeter between the (K871) SCB Valve Signal 1 circuit at the SCB Valve harness connector and the GPEC Adaptor. Make sure the voltmeter leads are connected so a positive polarity is displayed on the voltmeter.
      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.

    4. Start the engine and allow it to idle.
    5. Monitor the voltmeter.

      Is the voltage below 0.2 volts?

      Yes 

      • Go To  3

      No 

      • Repair the excessive resistance in the (K871) TPS 1 Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  3. CHECK FOR HIGH RESISTANCE IN THE (K915) SENSOR GROUND CIRCUIT 
    1. Turn the ignition off.
    2. Move the voltmeter leads to the (K915) Sensor Ground circuit between the SCB Valve harness connector and the GPEC Adaptor. Make sure the voltmeter leads are connected so a positive polarity is displayed on the voltmeter.
      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.

    3. Start the engine and allow it to idle.
    4. Monitor the voltmeter.

      Is the voltage below 0.2 volts?

      Yes 

      • Go To  4

      No 

      • Repair the excessive resistance in the (K915) Sensor Ground circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  4. CHECK FOR HIGH RESISTANCE IN THE (K872) SCB VALVE SIGNAL 2 CIRCUIT 
    1. Turn the ignition off.
    2. Move the voltmeter leads between the (K872) SCB Valve Signal 2 circuit at the SCB Valve harness connector and the GPEC Adaptor. Make sure the voltmeter leads are connected so a positive polarity is displayed on the voltmeter.
      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.

    3. Start the engine and allow it to idle.
    4. Monitor the voltmeter.

      Is the voltage below 0.2 volt?

      Yes 

      • Go To  5

      No 

      • Repair the excessive resistance in the (K872) SCB Valve Signal 2 circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. CHECK FOR HIGH RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT 
    1. Turn the ignition off.
    2. Move the voltmeter leads between the (F855) 5-Volt Supply circuit at the SCB Valve harness connector and the GPEC Adaptor. Make sure the voltmeter leads are connected so a positive polarity is displayed on the voltmeter.
    3. Start the engine and allow it to idle.
    4. Monitor the voltmeter.

      Is the voltage below 0.2 volt?

      Yes 

      • Go To  7

      No 

      • Repair the excessive resistance in the (F855) 5-Volt Supply circuit
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. CHECK FOR A SHORT BETWEEN THE (K871) SCB VALVE SIGNAL 1 CIRCUIT AND THE (K872) SCB VALVE SIGNAL 2 CIRCUIT 
    1. Turn the ignition off.
    2. Disconnect the SCB Valve harness connector.
    3. Disconnect the PCM C2 harness connector.
    4. Check for continuity between the (K871) SCB Valve Signal 1 circuit and the (K872) SCB Valve Signal 2 circuit.

      Is there continuity between the (K871) SCB Valve Signal 1 circuit and the (K872) SCB Valve Signal 2 circuit?

      Yes 

      • Go To  7

      No 

      • Repair the excessive resistance in the (F855) 5-Volt Supply circuit
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  7. REPLACE THE SUPERCHARGER BYPASS VALVE AND RETEST FOR DTC 
    1. Replace the Supercharger Bypass Valve in accordance with the Service Information.
    2. Turn the ignition on.
    3. With the scan tool, erase DTCs.
    4. Start the engine and test drive the vehicle. Perform several acceleration and deceleration cycles.
    5. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      • Go To  8

      No 

      • Replacing the Supercharger Bypass Valve repaired the fault.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  8. 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 .
scientia non olet · About LEMON Manuals