Retrieving Codes
- Code retrieval starts with the DIAGNOSTIC CIRCUIT CHECK. The CHECK ENGINE light comes on when ignition is on and engine is not running. When engine starts, CHECK ENGINE light should go off. If light remains on while engine is running, a trouble code is present.
- If light did not come on with key on and engine off, inspect CHECK ENGINE light circuit before continuing. If CHECK ENGINE light fails to operate, see DIAGNOSTIC CIRCUIT CHECK. Circuit checks are located within code charts.
- To retrieve codes, install jumper wire between White and Black wires of ALDL diagnostic connector, located behind left kick panel near ECM. See Figure
.NOTE: Diagnostic connector may also be referred to as ALDL test lead.
- Turn ignition on and count number of flashes from CHECK ENGINE light. A Code 12 will be a flash, pause and flash, flash. A long pause will occur. Code 12 will repeat 3 times. See Fig 1 . Each additional code will flash 3 times, starting with lowest number code to the highest number code. Once all codes are displayed, codes will be repeated.
- If system is operating properly (with no codes), a Code 12 should exist with ignition on and engine off. This indicates diagnostic system is working. Remove jumper wire from ALDL diagnostic connector after codes are retrieved.