Retrieving Codes

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 does not come on with key on and engine off, check CHECK ENGINE light circuit before continuing. See INITIAL DIAGNOSTIC PROCEDURE chart under DIAGNOSTIC FLOW CHARTS.
To retrieve codes, turn ignition off. Install Service Wire in diagnostic terminal, located in engine compartment. See Fig 1 . Turn ignition on and count flashes of CHECK ENGINE light.

Fig 1: Installing Service Wire In Diagnostic Terminal
Courtesy of SUZUKI OF AMERICA CORP.
For example, Code 21 is identified by a flash, flash, pause and flash. After a long pause, Code 21 is repeated twice. See Fig 2 . Each code is displayed 3 times, and then next code is flashed.
If system is operating properly (with no codes), a Code 12 should exist with ignition on and engine off. This indicates diagnostic system is capable of storing codes.
Once all codes are displayed, codes will be repeated. Remove fuse from diagnostic terminal in fuse block after stored codes are recorded.

Fig 2: Typical Code Display (Code 21 Is Shown)

Courtesy of SUZUKI OF AMERICA CORP.