Idle Speed: Testing and Inspection

CURB IDLE SPEED TESTING AND INSPECTION

(1) The vehicle should be prepared as follows before the inspection
- Engine coolant temperature: 85-95°C (185-205°F)
- Lights, electric cooling fan and accessories: OFF
- Transaxle: Neutral ("P" for vehicles with an automatic transaxle)

(2) Connect a tachometer.






- Insert a paper clip (from the harness side) into the 1-pin connector shown in the figure.






- Connect a primary-Voltage-detection type of tachometer to the paper clip.

Tachometer Connector Usage:

Caution: The paper clip should be inserted between the terminals as shown in the figure above.

NOTE: For rpm, one-half of the actual engine rpm is indicated, so the actual engine rpm is two times the indicated value shown by the tachometer.






- Use a jumper wire to ground the diagnostic test mode control terminal of the data link connector.






(3) Set a timing light in position.






(4) Ground the terminal for adjustment of ignition timing.

(5) Start the engine and let it idle.

(6) Check whether or not the ignition timing is the standard value; if not, adjust.
Standard value: 5° BTDC

(7) Stop grounding the terminal for adjustment of ignition timing.
(8) Let the engine idle for two minutes.
(9) Check the idling rpm.
Curb idle speed: 750 ± 1OO rpm

NOTE: The idling rpm is automatically regulated by the idle speed control system.

(1O) If not within the standard value range, refer to Diagnosis By Symptom under Computers and Control Systems.
If no fault is found, refer to Adjustments.