Automatic Transmission

PURPOSE
Raises engine speed in responsed to added electrical and A/C load.

Idle Up Control Linkages And Diaphragms:

A/C Idle Up Control Device:

APPLICATION
Models without A/C
Use diaphragm and linkage on carburetor to raise idle in response to added electrical load.
Models with A/C
Use diaphragm and linkage on carburetor to raise idle in response to added electrical load.
An air by-pass diaphragm on the carburetor to raise idle speed due to A/C compressor load. Fast Idle Control Device (FICD).

LOCATION
^ Idle-up solenoid is on the firewall near the brake master cylinder.
^ Fast Idle Control Device (FICD) solenoid is on the firewall near the windshield wiper motor.
^ Idle-up actuator is on the carburetor, near choke linkages.
^ FICD actuator is on the front of the carburetor body.

OPERATION
Electrical load idle-up actuator.
When the ECU energized the solenoid, vacuum is allowed to the diaphragm of the actuator. The diaphragm moves the rod which in turn moves the likages opening the throttle valve.
A/C load idle-up actuator.
When the A/C relay is energized, the signal to the compressor is also conducted the FICD solenoid. When the solenoid is energized, vacuum is allowed to act upon the diaphragm of the FICD. The FICD opens a passage in the carburetor secondary circuit. Air is allowed past the throttle plate, increasing idle speed.