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HOMESERVICE MANUALSJEEP2024GRAND CHEROKEE L LIMITED, RWDREPAIR AND DIAGNOSISSUSPENSIONSUSPENSION CONTROL SYSTEMSAIR SUSPENSION CONTROL MODULE (ASCM) - INTERMITTENT CONDITION, PRE-DIAGNOSTIC PROCEDURE AND VERIFICATION TESTSTANDARD PROCEDUREASCM PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDUREDIAGNOSTIC TEST
2024 Jeep Grand Cherokee L Limited, RWD

Diagnostic Test

2024 Jeep Grand Cherokee L Limited, RWDSECTION Diagnostic Test
  1. PRE-DIAGNOSTIC CHECK 
    1. Turn the ignition off.
    2. Disconnect all jumper wires and reconnect all previously disconnected components and connectors.
    3. Turn the ignition on.
    4. With the scan tool, erase DTCs.
    5. Make sure that all accessories are turned off and that the battery is fully charged.
      NOTE:

      If possible, perform checks with engine on.

    6. Using In-Vehicle Suspension Switch, set the vehicle in "OFF-ROAD (2)" to test for proper system operation.
      NOTE:

      Door and Hood ajar will prevent the ASCM from adjusting.

    7. If no issues found going into "OFF-ROAD (2)", Place vehicle into "ENTRY/EXIT" via Air Suspension Switch.
    8. If no issues found going into "ENTRY/EXIT", Place vehicle back into "NORMAL" via Air Suspension Switch.
    9. Test drive the vehicle (up to highway speeds) and verify proper operation.
    10. With the scan tool, read the ASCM DTCs.

      What Condition is present after Step 1?

      • Go to  2
      • Go to  3
  2. AIR SUSPENSION DTC CONDITION IS PRESENT 
    1. Turn the ignition off.
    2. Check for any Service Information Technical Service Bulletins (TSB) that may apply.
    3. Check the ASCM Fuse F0031 (30A), ASCM Fuse F17 (20A), and Run/Start FUSE F62 (10A).
    4. Inspect for the following:
      • doors or liftgate open.
        NOTE:

        Doors and Liftgate status are ignored when system is in diagnostic mode.

      • pinched or damaged lines.
      • damaged or leaking air-spring.
      • sensor linkages are installed and connected correctly.
      • no water present in hose or filter.
      • blocked air compressor intake line.
    6. Turn the ignition on.
    7. With the scan tool, generate a vehicle scan-log with the environmental conditions.
      NOTE:

      With the scan tool select metric units for proper accuracy.

      Is the DTC still Active?

      Yes 

      No 

  3. AIR LEAK TEST 
    1. Turn the ignition on.
    2. Set the vehicle to "OFF-ROAD (2)" via In-Vehicle Suspension Switch or Scan Tool.
    3. With the Scan Tool, record Air Spring Pressures via the "Component Air Mass/Pressure/Ride Height Readings" option.
    4. Place the Vehicle "In Plant Mode" by running any routine under Miscellaneous Function in the Scan tool, then Select "Cancel" instead of "Continue"
      NOTE:

      DTC

      C2212-00 ECU IN PLANT MODE 

      will be active while ASCM is in "In Plant Mode"; Disregard during leak test

    5. Turn the ignition off.
    6. Let the vehicle sit for a minimum of four hours.
      NOTE:

      Driving the vehicle above 12 mph will cause the ASCM to exit "In Plant Mode" leaving the possibility of the ASCM auto-adjusting; accuracy of leak test will be compromised.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.