Diagnostic Test

WARNING: This page is about a different car, the 2013 Dodge Avenger and 2013 Chrysler 200. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
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 2
  No
  - Perform the CHECKING FOR AN INTERMITTENT DTC diagnostic procedure. Refer to STANDARD PROCEDURE .
CHECK FOR 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 0.1 volts?
  
  Yes
  - Repair the battery positive (+) circuit between the generator and battery for high resistance.
  - Perform the PCM VERIFICATION Test. Refer to STANDARD PROCEDURE .
  No
  - Go To 3
CHECK FOR 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
  - Repair the excessive resistance in the Generator Case Ground.
  - Perform the PCM VERIFICATION Test. Refer to STANDARD PROCEDURE .
  No
  - Go To 4
CHECK THE (K20) GENERATOR FIELD CONTROL CIRCUIT FOR A SHORT TO VOLTAGE

Fig 1: Measuring Voltage Of Generator Field Control Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the Generator harness connector.
3. Disconnect the PCM C2 harness connector.
4. Turn the ignition on.
5. Measure the voltage of the (K20) Generator Field Control circuit.
  Is there any voltage present?
  
  Yes
  - Repair the (K20) Generator Field Control circuit for a short to voltage.
  - Perform the PCM VERIFICATION Test. Refer to STANDARD PROCEDURE .
  No
  - Go To 5
CHECK THE (K20) GENERATOR FIELD CONTROL CIRCUIT FOR A SHORT TO GROUND

Fig 2: Measuring Resistance Between Ground And Gen. Field Control Circuit In Generator Harness Connector
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Measure the resistance between ground and the (K20) Generator Field Control circuit in the Generator harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 6
  No
  - Repair the (K20) Generator Field Control circuit for a short to ground.
  - Perform the PCM VERIFICATION Test. Refer to STANDARD PROCEDURE .
CHECK THE (K20) GENERATOR FIELD CONTROL 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 (K20) Generator Field Control circuit between the Generator harness connector and the GPEC Adaptor.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 7
  No
  - Repair the (K20) Generator Field Control circuit for an open or high resistance.
  - Perform the PCM VERIFICATION Test. Refer to STANDARD PROCEDURE .
CHECK THE (A804) GENERATOR SENSE CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the (A804) Generator Sense between the Generator harness connector and the GPEC Adaptor.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 8
  No
  - Repair the (A804) Generator Sense circuit for an open or high resistance.
  - Perform the PCM VERIFICATION Test. Refer to STANDARD PROCEDURE .
GENERATOR
1. Turn the ignition off.
2. Reconnect the PCM C2 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) Generator 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
  - Replace the Generator in accordance with the service information.
  - Perform the PCM VERIFICATION Test. Refer to STANDARD PROCEDURE .
  No
  - Go To 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
  - Repair as necessary.
  - Perform the PCM VERIFICATION Test. Refer to STANDARD PROCEDURE .
  No
  - Replace and program the Powertrain Control Module (PCM) in accordance with the service information.
  - Perform the PCM VERIFICATION Test. Refer to STANDARD PROCEDURE .