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Home >> Jeep >> 2023 >> Wagoneer Carbide, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (3.0L - DTCS P2F64-00 To U0417-00) >> DTC Troubleshooting >> U0284-00-Lost Communication With Active Grill Shutter Module 1 >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2023 Jeep Grand Wagoneer L and 2023 Jeep Grand Wagoneer. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR AN ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) 
    1. Turn the ignition on.
    2. With the scan tool, view DTCs.

      Is the DTC active?

      Yes 

      • Go To  2

      No 

  2. INSPECT THE ACTIVE GRILL SHUTTER ASSEMBLY FOR SIGNS OF PHYSICAL DAMAGE 
    1. Inspect the Active Grill Shutter Assembly and connector for damage due to road debris.

      Is the Active Grill Shutter Assembly or connector damaged or disconnected?

      Yes 

      No 

      • Go To  3
  3. CHECK THE (A433) FUSED B+ CIRCUIT FOR PROPER VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the AGS harness connector.
    3. Measure the voltage at the (A433) Fused B+ circuit at the AGS harness connector.
      NOTE:

      The (A433) Fused B+ circuit is supplied to two terminals at the AGS Assembly. Be sure to check both circuits.

      Is the voltage equal to battery voltage?

      Yes 

      • Go To  4

      No 

      • Repair the (A433) Fused B+ circuit for an open or short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  4. CHECK THE (Z923) GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance between ground and the (Z923) Ground circuit at the AGS harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  5

      No 

      • Repair the (Z923) Ground circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. CHECK THE (D511) LIN BUS CIRCUIT FOR A SHORT TO GROUND 
    1. Disconnect the PCM C1 harness connector.
    2. Measure the resistance between ground and the (D511) LIN BUS circuit at the AGS harness connector.

      Is the resistance above 10k Ohms?

      Yes 

      • Go To  6

      No 

      • Repair the (D511) LIN BUS circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. CHECK THE (D511) LIN BUS CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (D511) LIN BUS circuit between the AGS harness connector and the PCM C1 harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  7

      No 

      • Repair the (D511) LIN BUS circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  7. CHECK THE ACTIVE GRILL SHUTTER ASSEMBLY FOR PROPER OPERATION 
    1. Replace the Active Grill Shutter Assembly in accordance with the service information. Navigate to Miscellaneous functions and perform the 'Active Grille Shutter Replaced' procedure.
    2. Reconnect the PCM C1 harness connector.
    3. Turn the ignition on.
    4. With the scan tool, erase DTCs.
    5. With the scan tool, actuate the AGS Assembly.
    6. With the scan tool, view DTCs.

      Did the DTC return?

      Yes 

      • Go To  8

      No 

  8. CHECK RELATED HARNESS CONNECTIONS 
    1. Disconnect all PCM harness connectors.
    2. Disconnect all related in-line harness connections (if equipped).
    3. Disconnect the related component harness connectors.
    4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Check for spread terminals and verify proper terminal tension.

      Repair any conditions that are found.

    5. Connect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    6. Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    7. Connect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. With the scan tool, erase DTCs.
    9. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
    10. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      • Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

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