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Diagnostic System Check

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2001 GMC Savana Special, 2001 GMC Savana Camper Special, 2001 GMC Savana, 2001 Chevrolet Chevy Express, and 2000 GMC Savana Special. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For circuit reference, see WIRING DIAGRAMS  .
  1. Install scan tool. If scan tool powers up, go to next step. If scan tool does not power up, diagnose data link communications. See DATA LINK CONNECTORS article in WIRING DIAGRAMS.
  2. Turn ignition on, with engine off. Using scan tool, attempt to establish communication with PCM and EBCM. If scan tool communicates with control modules, go to next step. If scan tool does not communicate with control modules, go to TEST C: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYMPTOM TESTS.
  3. Select display DTCs function on the scan tool for PCM and EBCM. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, go to SYMPTOM TESTS  .
  4. If scan tool displays any DTCs which begins with a "U", go to TEST C: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYMPTOM TESTS. If scan tool does not display any "U" series DTC, go to next step.
  5. If scan tool displays DTC P0500, P0502, P0503, P0562, P0563, P0601-P0607, P1381, P1621, P1627 or P1683, diagnose affected DTCs. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
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