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Retrieving Codes

NOTE: Codes can also be retrieved using a scan tester.
  1. The CHECK ENGINE light will come on when ignition is on and engine is not running. When engine is started, CHECK ENGINE light should go off. If light remains on while engine is running, a trouble code is present.
  2. If light does not come on with ignition on and engine off, CHECK ENGINE light circuit must be checked before continuing. See DIAGNOSTIC CIRCUIT CHECK under CODE CHARTS if CHECK ENGINE light fails to operate.
  3. To retrieve codes, install a jumper wire between terminals "A" and "B" of ALDL diagnostic connector. ALDL diagnostic connector is located near left kick panel on all vehicles. See Fig 1 .
    Fig 1: Identifying ALDL Connector Location
    G92C25108Courtesy of ISUZU MOTOR CO.
  4. Turn ignition on, and count number of flashes from CHECK ENGINE light to identify code. All codes will be flashed 3 times starting with lowest number. See Fig 2 .
  5. If system is operating properly (with no trouble codes present), Code 12 should be displayed with ignition on and engine off, indicating diagnostic system is capable of storing codes and providing diagnostic information.
  6. Once all codes are displayed, cycle will repeat. Remove jumper wire from ALDL connector after codes have been retrieved.
Fig 2: Code Display (Typical)
G122168Courtesy of ISUZU MOTOR CO.
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