Idle Speed: Testing and Inspection
IDLE SPEED CHECK PROCEDURESNOTE
1) Before adjusting, check that the spark plugs, injectors, ISC motor, compression, etc. are normal.
2) Clean the throttle body area.
Throttle Body
Adjustment conditions:
- Engine coolant temperature is 80 to 95°C (176 to 205°F).
- Lights, electric cooling fan and all accessories are off.
- Transaxle is in neutral [P or N range for A/T vehicles].
- Steering wheel in straight forward position (vehicles with power steering).
1. Loosen the accelerator cable.
M31-1 Data Link Connector:
2. Connect the scan tool to the data link connector in the fuse box.
3. If the scan tool is not used, connect a tachometer, and ground the data link connector.
4. Ground the ignition timing adjustment terminal.
5. Run the engine for more than 5 seconds at an engine speed of 2,000 to 3,000 rpm.
6. Run the engine at idle for 2 minutes.
7. Check that the engine rpm is within the standard value.
Basic idle speed 750 ± 100 rpm
NOTE
1) The engine speed on a new vehicle driven less than 500 Km (300 miles) may be 20 to 100 prkm lower than specification, but no adjustment is necessary.
2) If the engine stalls or the engine speed is low after the vehicle has been driven a distance of 500 km (300 miles) or more, a deposit on the throttle valve area is suspected.
8. It the basic idle speed is out of specification, adjust basic idle the speed.
NOTE: If the idle speed is higher than specified, even with the speed adjusting screw (SAS) fully closed, check whether the idle switch (fixed SAS) moving mark exists or not. If it is found that the switch has moved, adjust the idle switch (fixed SAS) has been mis-adjusted.
9. Turn the ignition switch to the OFF position.
10. If a scan tool was not used, disconnect the data link connector grounding wire.
11. Disconnect the lead wire from the ignition timing adjusting terminals.
12. Run the engine again and let it idle for about 10 minutes. Check that the engine is in normal idling condition.