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Home >> Jeep >> 2022 >> Gladiator Mojave, Part Time T/Case Control, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (3.0L Diesel - DTCS P0651-00 To P0691-00) >> DTC Troubleshooting >> P0683-00-Glow Plug Control Module 1 To Pcm Communication Circuit >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR THE DTC TO RETURN 
    1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
    2. For future reference, run and save a vehicle Scan Report and all related recorded data.
    3. With the scan tool, erase all DTCs.
    4. Turn the ignition off for a minimum of 10.0 seconds.
    5. Turn the ignition on.
    6. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
    7. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      • Go To  2

      No 

      • Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT DTC .
  2. CHECK THE GENERATOR FOR PROPER OPERATION 
    1. Turn the ignition off. Leave it off for 5 minutes.
    2. Disconnect the Generator Module harness connector.
    3. Ignition on, engine not running.
    4. With the scan tool, erase DTCs in the PCM.
    5. Crank the engine for no more than 10 seconds if it will not start.
    6. With the scan tool, select View DTCs.

      Is DTC P0683-00, U0106-00, or U0407-00 active?

      Yes 

      • If it is this DTC that reset, Go To  3
      • If it is one of the other two DTCs that reset, perform the Diagnostics for those DTCs before continuing with this one.

      No 

  3. CHECK THE (D511) LIN BUS CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT IN THE PCM C1 CONNECTOR HARNESS 
    1. Turn the ignition off.
    2. Disconnect the Glow Plug Module harness connector.
    3. Disconnect the PCM C1 harness connector.
    4. Measure the resistance between the (D511) LIN Bus circuit and all other circuits on the PCM C1 harness connector at the PCM C1 harness connector.

      Is the resistance above 10k Ohms on all other circuits?

      Yes 

      • Go To  4

      No 

      • Repair the (D511) LIN Bus circuit for a short to the circuit that measured less than 10k Ohms.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .
  4. CHECK THE (D511) LIN BUS CIRCUIT FOR A SHORT TO GROUND 
    1. Measure the resistance between ground and the (D511) LIN Bus circuit at the Glow Plug Module harness connector.

      Is the resistance above 10k Ohms?

      Yes 

      • Go To  5

      No 

  5. CHECK THE (D511) LIN BUS CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (D511) LIN Bus circuit between the Glow Plug Module harness connector and the PCM C1 harness connector.

      Is the resistance above 5.0 Ohms?

      Yes 

      No 

      • Go To  6
  6. CHECK THE (F343) ASD SUPPLY CIRCUIT, (A29) FUSED B+ CIRCUIT AND THE (Z909) GLOW PLUG MODULE GROUND CIRCUIT FOR A SHORT TO GROUND OR AN OPEN/HIGH RESISTANCE 
    1. Reconnect the PCM C1 harness connector.
    2. Turn the engine on.
    3. Turn the ignition on, engine off.
    4. Measure the voltage across the (F343) ASD Supply circuit and the (Z909) Glow Plug Module Ground circuit at the Glow Plug Module harness connector. Then, measure the voltage across the (A29) Fused B+ circuit and the (Z909) Glow Plug Module Ground circuit at the Glow Plug Module harness connector.

      Was the difference of either voltage reading greater than 1.0 Volts of battery voltage?

      Yes 

      • Repair the (F343) ASD Supply circuit or the (A29) Fused B+ circuit for an open or short to ground, or check the (Z909) Ground circuit for an open.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  7
  7. CHECK THE GLOW PLUG MODULE WIRE HARNESS AND CONNECTORS FOR DAMAGE 
    1. Turn the ignition off.
    2. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Glow Plug Module and the PCM.
    3. Look for any chafed, pierced, pinched, or partially broken wires.
    4. Look for broken, bent, pushed out or corroded terminals.

      Were any problems found?

      Yes 

      No 

      • Go To  8
  8. CHECK THE GLOW PLUG MODULE FOR PROPER OPERATION 
    1. Replace the Glow Plug Module in accordance with the Service Information.
    2. Turn the ignition on.
    3. With the scan tool, erase PCM DTCs.
    4. Turn the ignition off. Leave the ignition off for 5 minutes.
    5. Start the engine.
    6. Allow the engine to run for 2 minutes.
    7. With the scan tool, read PCM DTCs.

      Does the scan tool display this DTC?

      Yes 

      • Go To  9

      No 

  9. 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 3.0L, POWERTRAIN VERIFICATION TEST .

      No 

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