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Retrieving Codes (Non-Scan)

NOTE: Inserting jumper wire into test and ground terminals of DLC connector with engine running will cause fuel injected vehicles to enter field service mode. Flashes of SERVICE ENGINE SOON light will not indicate codes if this is done. See FIELD SERVICE MODE CHECK in BASIC TESTING article in this section.
  1. Turn ignition on. DO NOT  start engine. SERVICE ENGINE SOON light should glow. Locate Data Link Connector (DLC) attached to control module wiring harness. Most DLC connectors are located under dash on driver side of vehicle. For exact location of DLC, see COMPONENT LOCATIONS in I - SYS/COMP TESTS article in this section. Insert jumper wire from terminal "B" (diagnostic test terminal) to terminal "A" (ground) of DLC connector. See Fig 1.
  2. SERVICE ENGINE SOON light should begin to flash codes. Each code will be repeated 3 times. If codes are not flashed or SERVICE ENGINE SOON light does not glow, perform DIAGNOSTIC CIRCUIT CHECK in BASIC TESTING article in this section. To exit diagnostic mode, turn ignition off and remove jumper wire from DLC connector.
Fig 1: DLC Connector Terminal Identification
G90B01199Courtesy of GENERAL MOTORS CORP.
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