WARNING: This page is about a different car, the 2004 Suzuki Vitara. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: DTC P0505 / P0506 / P0507: Idle Control System/RPM Lower Than Expected/RPM Higher Than Troubleshooting Chart (1 Of 2)
Courtesy of SUZUKI OF AMERICA CORP.
Fig 2: DTC P0505 / P0506 / P0507: Idle Control System/RPM Lower Than Expected/RPM Higher Than Troubleshooting Chart (2 Of 2)