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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1573 (6.7L Diesel - DTCS P065A To P209F - 2500 Hd) >> DTC Troubleshooting >> P125A-Power Enable Control Circuit Low >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. ACTIVE DTC 
    1. Turn the ignition on.
    2. With the scan tool, read DTCs.

      Is this DTC active?

      Yes 

      • Go To  2

      No 

  2. CHECK THE (N639) VGT 12 VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Disconnect the VGT harness connector.
    3. Disconnect the PCM C1 harness connector.
    4. Measure the resistance between ground and the (N639) VGT 12 Volt Supply circuit at the VGT harness connector.

      Is the resistance below 10k Ohms?

      Yes 

      • Repair the (N639) VGT 12 Volt Supply circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK THE (N639) VGT 12 VOLT SUPPLY CIRCUIT FOR A SHORT TO THE (K639) VGT RETURN CIRCUIT 
    1. Measure the resistance between the (N639) VGT 12 Volt Supply circuit and the (K639) VGT Return circuit at the VGT harness connector.

      Is the resistance below 10k Ohms?

      Yes 

      • Repair the (N639) VGT 12 Volt Supply circuit for a short to the (K639) VGT Return circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE (N639) VGT 12 VOLT SUPPLY CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (N639) VGT 12 Volt Supply circuit between the VGT harness connector and the PCM C1 harness connector.

      Is the resistance above 5.0 Ohms?

      Yes 

      • Repair the (N639) VGT 12 Volt Supply circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  5
  5. VGT ACTUATOR ASSEMBLY 
    1. Reconnect the PCM C1 harness connector.
    2. Turn the ignition on and wait 1 minute.
    3. With a voltmeter connected to ground, measure the voltage of the (N639) VGT 12 Volt Supply circuit at the VGT harness connector.

      Is the voltage equal to battery voltage?

      Yes 

      • Replace the VGT Actuator Assembly in accordance with the service information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Replace the Powertrain Control Module in accordance with the service information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
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