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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1117 (Drive Axle - Limited-Slip Differential) >> Diagnostic Information and Procedures >> Diagnostic System Check - Locking/Limited Slip Rear Axle >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
  • Do not clear the DTC unless directed by a diagnostic procedure. Clearing the DTCs will erase all Freeze Frame and Failure Records stored in the powertrain control module (PCM) or the transmission control module (TCM) memory.
  • Poor engine performance can sometimes be diagnosed as a rear axle driveability condition. In order to avoid mis-diagnosis of the rear axle, always perform Diagnostic System Check - Engine Controls in Engine Controls - 3.4L or Diagnostic System Check - Engine Controls in Engine Controls 3.6L.
  • Use a scan tool that is known to function correctly. If necessary, test the scan tool on another vehicle.
  • Ensure the scan tool contains the most current file available.
  • The scan tool will display a loss of communication error message under the following conditions:
    • The PCM/TCM power is interrupted.
    • The ignition switch is turned OFF.
    • The battery voltage level is very low.
    • A poor connection at the diagnostic link connector (DLC).
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