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Diagnostic Test

  1. DTC IS ACTIVE 
    1. Start the engine and allow it to reach normal operating temperature.
      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, select View DTCs.

      Is the status Active for this DTC?

      Yes 

      • Go to step  2

      No 

  2. (K20) GEN FIELD CONTROL CIRCUIT SHORTED TO GROUND 
    Fig 1: Checking Generator Field Control Circuit
    GC0099984Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the Generator connector.
    3. Disconnect the Powertrain Control Module (PCM) connector.
    4. Measure the resistance between ground and the (K20) Gen Field Control circuit in the Generator harness connector.

      Is the resistance below 100 ohms?

      Yes 

      No 

      • Go to step  3
  3. (K20) GEN FIELD CONTROL CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 2: Checking Generator Field Control Circuit
    GC0099985Courtesy of CHRYSLER LLC
    NOTE: When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.
    1. Measure the resistance of the (K20) Gen Field Control circuit between the Generator harness connector and the Powertrain Control Module (PCM) harness connector.

      Is the resistance below 5.0 ohms?

      Yes 

      • Go to step  4

      No 

  4. GENERATOR FIELD CONTROL ACTUATION 
    Fig 3: Checking Generator Field Control Circuit
    GC0099986Courtesy of CHRYSLER LLC
    1. Connect the Powertrain Control Module (PCM) connector.
    2. Turn the ignition on.
    3. With the scan tool, actuate the Generator field control to the ON (100%) position.
    4. Using a 12 volt test light connected to ground, check the (K20) Gen Field Control circuit in the Generator harness connector.
      NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.
    5. With the scan tool, actuate the Generator field control to the OFF (0%) position.
    6. Using a 12 volt test light connected to ground, check the (K20) Gen Field Control circuit in the Generator harness connector.
      NOTE: The test light should not be illuminated.

      Is the test light illuminated and bright with the actuation ON (100%) and not illuminated with the actuation OFF (0%)?

      Yes 

      • Go to step  5

      No 

      • Go to step  6
  5. GENERATOR 
    1. Turn the ignition off.
    2. Inspect the wiring and connectors between the Generator and the Powertrain Control Module (PCM).
    3. Look for any chafed, pierced, pinched, or partially broken wires.
    4. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related connectors.

      Were any problems found?

      Yes 

      No 

  6. POWERTRAIN CONTROL MODULE (PCM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Generator and the Powertrain Control Module (PCM).
    2. Look for any chafed, pierced, pinched, or partially broken wires.
    3. Look for broken, bent, pushed out or corroded terminals.
    4. Refer to any Technical Service Bulletins that may apply.

      Were any problems found?

      Yes 

      No 

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