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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1787 (Automatic Transmission - Mu4) >> Diagnostic Information and Procedures >> Powertrain On Board Diagnostic (OBD) System Check - Automatic Transmission >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2003 Pontiac Vibe. 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 DTC(s) will erase all Freeze Frame and Failure Records stored in PCM memory.
  • Poor engine performance can sometimes be diagnosed as a transmission driveability condition. In order to avoid mis-diagnosis of the automatic transmission, always perform DIAGNOSTIC STARTING POINT - ENGINE CONTROLS in Engine Controls.
  • 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:
    • PCM power is interrupted.
    • The ignition switch is turned OFF.
    • The battery voltage level is very low.
    • A poor connection is present at the diagnostic link connector (DLC).
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