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 under DIAGNOSTIC FLOW CHARTS.
To retrieve codes, turn ignition off. Install fuse in diagnostic terminal on fuse block, located behind left side of instrument panel. See Fig 1 . Turn ignition on and count flashes of CHECK ENGINE light.

Fig 1: Installing Fuse 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.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Retrieving Codes