Idle Speed and IAC Throttle Valve Opening Inspection
Before idle speed check, make sure of the following.
- Lead wires and hoses of electronic fuel injection and engine and emission control systems are connected securely.
- Valve clearance has been is checked according to maintenance schedule.
- Ignition timing is within specification.
- All electrical systems (wipers, heater, lights, A/C, etc.) are out of service.
- Air cleaner has been properly installed and is in good condition.
- There are no abnormal air drawn in from air intake system.
- There are no obstruction in PCV valve or its hoses.
- There are no DTC in ECM.
- Check following item turn OFF by using "Data List" mode on scan tool.
- A/C Comp Relay
- A/C Switch
- Brake Switch
- PSP Switch (P/S signal)
- Electric Load
- Blower Fan
After confirming all items, check idle speed and IAC throttle opening as follows.
- Turn OFF ignition switch and connect SUZUKI scan tool to DLC (1).
Special Tool
(A): SUZUKI scan tool (SUZUKI-SDT)
- Place gear shift lever in "Neutral" (M/T model) or selector lever in "P" range (A/T model), and set parking brake and block the wheels.
- Start engine and warm up engine to normal operating temperature.
- Check engine idle speed and "IAC throttle opening" using "Data List" mode on scan tool. If check result is out of specification, inspect the following.
- Ignition timing: Refer to IGNITION TIMING INSPECTION .
- Improper engine idle speed referring to "Improper engine idling or engine fails to idle" in Engine Symptom Diagnosis .
- EVAP canister purge control system: Refer to EVAP CANISTER PURGE SYSTEM INSPECTION .
- PCV system: Refer to PCV HOSE INSPECTION .
- Throttle body assembly: Refer to THROTTLE BODY ASSEMBLY ON-VEHICLE INSPECTION .
Engine idle speed
A/C OFF: 630 - 730 rpm (IAC throttle opening: 10 - 20%)
A/C ON: 800 - 900 rpm (IAC throttle opening: 15 - 25%)
- Check that specified engine idle speed is obtained with A/C turned ON if vehicle is equipped with A/C.
If not, check A/C system.