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Diagnostic Test

WARNING: This page is about a different car, the 2009 Dodge Caliber. However, it is still accessible from the selected car via links, so may be relevant.
  1. DTC IS ACTIVE 
    NOTE: Inspect the vehicle for aftermarket accessories that may exceed the generator system output.
    NOTE: Inspect the condition and tension of the generator belt before continuing.
    NOTE: Inspect the battery before continuing.
    1. Ignition on, engine not running.
    2. With a scan tool, select View DTCs. Record DTC and Freeze Frame information
    3. With a scan tool, clear DTCs.
    4. Start the engine and allow it to reach operating temperature.
    5. With the scan tool, select View DTCs.

      Is the status Active for this DTC?

      Yes 

      • Go to step  2

      No 

  2. EXCESSIVE RESISTANCE IN THE B(+) CIRCUIT 
    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.
    NOTE: Make sure all test equipment and cables are clear of any belts, pulleys, or other moving parts.
    1. Monitor the voltage between the generator B(+) output terminal and the battery positive (+) post.
    2. Start the engine.

      Is the voltage above 0.4 volts?

      Yes 

      No 

      • Go to step  3
  3. EXCESSIVE RESISTANCE BETWEEN THE GENERATOR CASE AND GROUND 
    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.
    NOTE: Make sure all test equipment and cables are clear of any belts, pulleys, or other moving parts.
    1. Monitor the voltage between the generator case and battery ground (-) post.
    2. Start the engine and allow it to reach operating temperature.

      Is the voltage above 0.1 volts?

      Yes 

      No 

      • Go to step  4
  4. (K20) GEN FIELD CONTROL CIRCUIT SHORTED TO VOLTAGE 
    Fig 1: Checking Generator Field Control Circuit
    GC0099983Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the Generator harness connector.
    3. Disconnect the Powertrain Control Module (PCM) harness connector.
    4. Turn the ignition on.
    5. Measure the voltage of the (K20) Gen Field Control circuit.

      Is there any voltage present?

      Yes 

      No 

      • Go to step  5
  5. (K20) GEN FIELD CONTROL CIRCUIT SHORTED TO GROUND 
    Fig 2: Checking Generator Field Control Circuit
    GC0099984Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. 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  6
  6. (K20) GEN FIELD CONTROL CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 3: Checking Generator Field Control Circuit
    GC0099985Courtesy of CHRYSLER LLC
    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  7

      No 

  7. (A804) GEN SENSE CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 4: Checking GEN Sense Circuit
    GC0099992Courtesy of CHRYSLER LLC
    1. Measure the resistance of the (A804) Gen Sense between the Generator harness connector and the Powertrain Control Module (PCM) harness connector.

      Is the resistance below 5.0 ohms?

      Yes 

      • Go to step  8

      No 

  8. GENERATOR 
    1. Turn the ignition off.
    2. Connect the Powertrain Control Module (PCM) harness connector.
    3. Turn the ignition on.
    4. With a scan tool, actuate the Generator Field to toggle on and off.
    5. Using a 12-volt test light connected to ground, check the (K20) Gen Field Control in the Generator harness connector.
      NOTE: The test light should be illuminated and bright when toggled on. Compare the brightness to that of a direct connection to the battery.

      Does the test light toggle on and off correctly during the actuator test?

      Yes 

      No 

      • Go to step  9
  9. 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. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
    5. Look for the data to change or for the DTC to reset during the wiggle test.
    6. Refer to any Technical Service Bulletins that may apply.

      Were any problems found?

      Yes 

      No 

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