Retrieving Codes
NOTE:
Codes can also be retrieved using a Scan tester.
- 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, code is present.
- If light did not come on with key on and engine off, the CHECK ENGINE light circuit must be checked before continuing. See AMIGO, PICKUP & TROOPER DIAGNOSTIC CIRCUIT CHECK in this article if CHECK ENGINE light failed to operate. Circuit checks are located within code charts.
- To retrieve codes, turn ignition on. Install jumper wire between diagnostic leads. See Fig 1 . Count number of flashes from CHECK ENGINE light. A Code 12 is identified by a flash, pause and flash, flash. A long pause occurs and Code 12 repeats 3 times. See Fig 2 . Each additional code flashes 3 times starting with lowest code to the highest and repeat 3 times.
- If system is operating properly (with no codes), a Code 12 should exist with ignition on and engine off. This indicates the diagnostic system is capable of storing codes.
- Each additional code repeats 3 times and then the next code follows. See Fig 2 . Once all codes are displayed, codes will repeat. After codes are retrieved, remove jumper wire from diagnostic leads to exit diagnostic mode.