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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Body Control Modules) >> Self-Diagnostic System >> Automatic Transmission Powertrain On Board Diagnostic System Check >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2001 GMC Safari and 2001 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.

Do not clear DTCs unless directed by a diagnostic procedure. Clearing DTCs 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 automatic transmission, always perform engine controls diagnostic system check. Use a scan tool that is known to function correctly. If necessary, test scan tool on another vehicle. Ensure scan tool contains most current file available. Scan tool will display a loss of communication error message under following conditions: PCM power is interrupted. Ignition switch is turned OFF position. Battery voltage level is very low. A poor connection at data link connector.

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