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, a trouble 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 appropriate DIAGNOSTIC CIRCUIT CHECK in this article if CHECK ENGINE light failed to operate. Circuit checks are located with code charts.
- To retrieve codes on Impulse models, install jumper wire between Orange/Black & Black/Blue wires of ALDL connector. The ALDL connector is a 3-wire White connector, located behind passenger's side kick panel.
- On all models, turn ignition on and count number of flashes from CHECK ENGINE light. A Code 12 will be identified by a flash, pause and flash, flash. A long pause will exist and Code 12 will be repeated 3 times. See Fig 1 . Each additional code will flash 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 individual code will be repeated 3 times and then display the next code. See Fig 1 . Once all codes are displayed, codes will be repeated. Remove jumper wire from ALDL connector after codes are retrieved.