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Home >> Cadillac >> 2017 >> Escalade ESV Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Transfer Case - Mp 3010 (NP0)) >> Diagnostic Information and Procedures >> DTC P17D4, P185F, or P279A-P279C: Transfer Case/Four Wheel Drive (4WD) Neutral Range Performance (L83) >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 GMC Yukon XL, 2017 GMC Yukon, 2017 Chevrolet Tahoe, and 2017 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

Please first be sure to review the Diagnostic Aids before continuing further.

  1. Ignition - On / Vehicle - In Service Mode & Engine - Off
  2. Verify DTC P0502, P0503, P0721, P0722, P0723, P077C, P077D, P2160, or P2161 is not set as current or in history
    • If none of the DTCs are set 
  3. Ignition On - Engine Running - Greater than 1 min
    4. NOTE:

    It may take up to 2 min for all vehicle systems to power down.

  4. Ignition OFF for greater than 2 min, key out of the ignition/keyless start transmitter 1 m (3 ft) away from the vehicle, and all vehicle systems OFF.
  5. Ignition - On / Vehicle - In Service Mode & Engine - Off
  6. Verify DTC P17D4, P185F, P279A, P279B, P279C is only set as a history DTC.
    • If any of the DTCs are set as current.  Refer to: Circuit/System Testing
    • If any of the DTCs are only set as history.  Refer to Diagnostic Aids before proceeding with Circuit/System Testing.
    • If none of the DTCs are set 
  7. Clear All Vehicle DTCs
  8. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  9. When operating the vehicle within the Conditions for Running the DTC, monitor the following parameters (they should match each other and show a smooth/steady curve when viewed in graph form):
    • Transmission OSS scan too parameter in the Transmission Control Module scan tool data list
    • Transfer Case OSS scan too parameter in the Engine Control Module scan tool data list
    • If the above parameters match and are smooth 
  10. All OK.
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