EGR System Inspection (Using SUZUKI Scan Tool)

Connect SUZUKI scan tool to DLC (1) with ignition switch turned OFF.
Special Tool
1. SUZUKI scan tool
  
  Fig 1: Connecting SUZUKI Scan Tool To DLC
  Courtesy of SUZUKI OF AMERICA CORP.
Start engine and warm it up to normal operating temperature.
With engine idling (without depressing accelerator pedal), open EGR valve by using "MISC. TEST" mode. In this state, according as EGR valve opening increases engine idle speed drops. If not, possible cause is clogged EGR gas passage, stuck or faulty EGR valve.

Fig 2: Identifying Scan Tool Display - EGR Valve
Courtesy of SUZUKI OF AMERICA CORP.