Computers and Control Systems: Adjustments

CURB IDLE SPEED INSPECTION

NOTE: Adjustment of the idle speed is usually unnecessary.
Idle speed on fuel injected vehicles is controlled by the MPI Control Unit through the Idle Speed Control System.

Before checking the CURB idle speed, be sure:
^ Engine coolant temperature has reached 85-95~C (185-205~F)
^ Engine cooling fan, lights* and electrical accessories are OFF
^ Transaxle is in NEUTRAL or PARK.
^ Steering wheel is at a center position (power steering equipped)
^ Parking brake is applied.
^ Verify that the ignition timing is set to specifications. Refer to SPECIFICATIONS/ELECTRICAL.

Tachometer Connection:

CAUTION: Improper setting of the throttle valve opening will increase exhaust gas temperatures at deceleration, which will greatly reduce the life of the Catalytic Converter. Also, fuel consumption and engine braking will be affected.

1. Connect a tachometer to the engine speed detection terminal.

2. Start and run the engine for more than 5 seconds at 2,000 to 3,000 rpm.

3. Reduce the rpm and let the engine idle for 2 minutes.

4. Read the CURB idle speed. Refer to SPECIFICATIONS/MECHANICAL.