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Home >> Jeep >> 2023 >> Grand Cherokee Altitude, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 65 (5.7L - DTCS P0462 To P0585) >> DTC Troubleshooting >> P04FC Crankcase Ventilation System Performance >> Diagnostic Test

Diagnostic Test

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  1. CHECK FOR AN ACTIVE DTC 
    1. Turn the ignition on.
    2. With the scan tool, erase DTCs in the Powertrain Control Module (PCM).
    3. Start the engine and allow it to reach normal operating temperature.
    4. With the scan tool, read DTCs and record on the repair order.

      Is the DTC active or pending?

      Yes 

      • Go To  2

      No 

  2. CHECK FOR OTHER DTCS 
    1. Review the recorded DTCs.

      Are there any 5-Volt Supply circuit or Crankcase Pressure Sensor circuit DTCs active or pending?

      Yes 

      No 

      • Go To  3
  3. CHECK THE CRANKCASE HOSES FOR CLOGGING, LEAKS, OR OTHER DAMAGE 
    1. Turn the ignition off.
    2. Inspect the Crankcase Hose and connections for signs of clogging, leaks, or other damage.

      Is the Crankcase Hose broken, pinched, leaking, or otherwise damaged?

      Yes 

      • Replace the damaged hose in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE INTAKE MANIFOLD FOR LEAKS 
    1. Visually inspect the Intake Manifold for signs leaks or damage.

      Were any issues or leaks found at the Intake Manifold?

      Yes 

      • Make the appropriate repair in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Replace the PCV Valve in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .