Service Repair Manual

SERVICE ADJUSTMENT PROCEDURES (FBC)
THROTTLE OPENER ADJUSTMENT
For Operation Under Electrical Load
The procedure that follows is to check and adjust the idle speed
control operation of the throttle opener when electric load is
applied.
1.
2.
3.
4.
5.
6.
Make sure curb idle speed is within the specified speed. If
outside the specified limits, readjust the speed to the
nominal specification.
By using the auxiliary lead wire, activate the idle-up control
solenoid valve, apply the intake manifold vacuum to the
idle-up actuator and activate the idle-up actuator.
Open the throttle slightly (to an engine speed of about 2,000
rpm), and then slowly close it.
Adjust the engine speed to the specified speed with the
idle-up adjusting screw.
Throttle opener adjusting rpm (For electrical load)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
800 ± 50 rpm
After repeating step 3, check the engine speed.
Remove the auxiliary lead wire used in step 2, and reconnect
the idle-up solenoid valve wiring.
For Operation Under Air Conditioner Load
The procedure that follows is to check and adjust the idle speed
control operation of the throttle opener when air conditioning
load is applied.
1.
2.
3.
4.
5.
Start the engine.
Set the tachometer
Turn on the air conditioner switch.
NOTE
The solenoid valve with open and the intake manifold
vacuum will act on the throttle opener to fully actuate it.
Check the engine speed during this operation.
Throttle opener adjusting rpm (For A/CON). . . . . . . . . . . . . .
900 ± 25 rpm
If the engine speed is out of specification, adjust using the
throttle (for air conditioner) adjusting screw.
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