Idle Speed Adjustment

Before idle speed check and adjustment, make sure of the following.

^ Lead wires and hoses of Electronic Fuel Injection and engine emission control systems are connected securely.

^ Accelerator cable has some play that is, it is not tight.

^ Ignition timing is within specification.

^ All accessories (wipers, heater, lights, etc.) are out of service.

^ Air-conditioner is OFF, if equipped.

^ Air cleaner has been properly installed and is in good condition.

After above items are all confirmed, check idle speed as follows.


NOTE: Before starting engine, place transmission gear shift lever in "Neutral" (shift selector lever to "P" range for A/T model), and set parking brake and block drive wheels.


1. Warm up engine to normal operating temperature.

2. Set tachometer

Grounding Diagnosis Switch Terminal:

3. Connect spare fuse to diagnosis switch terminal in junction/fuse block, and amount of air supplied by (SC solenoid valve will be kept constant.


NOTE: At this time, "CHECK ENGINE" light should indicate diagnostic code NO. 12 and also operation of ISC solenoid valve should be heard. If not, proceed to TESTING AND INSPECTION / FLOW OF DIAGNOSIS.

4. Check to ensure that idle speed is within below specification.

ENGINE IDLE SPEED
M/T model 750 ± 50 rpm
A/T model 850 ± 50 rpm

Idle Speed Adjusting Screw:

5. If idle speed is not within specified range, adjust it by turning idle speed adjusting screw.

6. This step is for checking and/or adjusting engine idle speed when air-conditioner is working.

With cars without air conditioner, advance to steps 7 and 8. With air-conditioner equipped ones, follow procedure described below.

a) Turn air-conditioner switch ON and set heater blower switch to low speed position. Then check that air-conditioner is working.

b) Check to ensure that idle speed is within below specification.


ENGINE IDLE SPEED WITH AIR-CONDITIONER ON
M/T model 900 ± 50 rpm
A/T model 850 ± 50 rpm

A/C Idle Speed Adjusting Screw:

c) If it is not within specified range, adjust it by turning adjusting screw of air-conditioner VSV.

7. Upon completion of adjustment, install adjusting screw cap to throttle body.

8. Disconnect spare fuse from diagnosis switch terminal.