Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

CHECK FOR AN ACTIVE DTC
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, read DTCs.
  Is the DTC active or pending?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT DTC .
CHECK THE GENERATOR LIN BUS CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Generator harness connector.
3. Disconnect the PCM C1 harness connector.
4. Measure the resistance between the Generator LIN BUS circuit and all other circuits at the PCM C1 harness connector.
  Did the Generator LIN BUS circuit measure above 10k Ohms to all other circuits?
  
  Yes
  - Go To 3
  No
  - Repair the Generator LIN BUS circuit for a short to the PCM C1 circuit that measured below 10k Ohms.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .
CHECK THE GENERATOR LIN BUS CIRCUIT FOR A SHORT TO GROUND
1. Measure the resistance between ground and the Generator LIN BUS circuit at the Generator harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the Generator LIN BUS circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .
CHECK THE GENERATOR LIN BUS CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the Generator LIN BUS circuit between the Generator harness connector and the PCM C1 harness connector.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the Generator LIN BUS circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5
GENERATOR
1. Connect the PCM C1 harness 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 Generator LIN BUS 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 (K509) Generator LIN BUS circuit at 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
  - Replace the Generator in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .
  No
  - Go To 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. Perform any Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .