Basic Idle Speed

NOTE: Adjustment of idle speed is usually not required. If idle speed is out of specification check and verify the operation of the idle speed control system. Refer to COMPUTERIZED ENGINE CONTROLS.

Fig. 83 Connecting Tachometer To Engine Speed Terminal:

1. Confirm initial inspection conditions:
a. Engine coolant temperature is 185 - 205°F.
b. Lights, cooling fan and all accessories are OFF.
c. Transaxle is in neutral or park.
d. Steering wheel is in straight-ahead position, (on vehicles with power steering).

2. Check the ignition timing and adjust, if necessary. (Refer to procedure)
3. Connect a tachometer to the engine speed detection connector, Fig. 83. Do not unplug the connector.
4. Start the engine and idle for 2 minutes.
5. Check the engine idle speed. If it is NOT within specifications, check the idle speed control system.

Curb Idle Speed: 750 ± 100 RPM

6. Stop engine and disconnect tachometer. (Leave tachometer connected, if further adjustments are required).

Fig. 116 Component Locations (Ignition Timing Adjustment Connector):

IDLE SPEED CONTROL (ISC) SYSTEM

1. Connect a tachometer to the engine speed detection terminal.
2. Remove the waterproof plug from the connector for ignition timing adjustment and ground the terminal using a jumper wire. Fig. 116
3. Connect the data-transfer switching terminal (No. 10) of the self-diagnosis connector, (located under the LH side of instrument panel), to ground with a jumper wire.
4. Start the engine and let it run at idle.
5. Compare the engine speed to the basic idle speed specification.

Basic Idle Speed: 750 ± 50 RPM

Fig. 56 Idle-Speed Control Adj. Screw (Viewed From Above Engine):

6. If the idle speed is NOT as specified, adjust the speed adjusting screw.
7. Stop the engine, disconnect jumper wires, remove tachometer and reinstall waterproof plug in the connector for ignition timing adjustment.
8. Start the engine, operate for 10 minutes and confirm that idling condition is normal.