Jeep Cherokee (XJ): Throttle body
DESCRIPTION
The throttle body is located on the intake manifold.
Fuel does not enter the intake manifold through the throttle body. Fuel is sprayed into the manifold by the fuel injectors.
OPERATION
Filtered air from the air cleaner enters the intake manifold through the throttle body. The throttle body contains an air control passage controlled by an Idle Air Control (IAC) motor. The air control passage is used to supply air for idle conditions. A throttle valve (plate) is used to supply air for above idle conditions.
Certain sensors are attached to the throttle body.
The accelerator pedal cable, speed control cable and transmission control cable (when equipped) are connected to the throttle body linkage arm.
A (factory adjusted) set screw is used to mechanically limit the position of the throttle body throttle plate. Never attempt to adjust the engine idle speed using this screw. All idle speed functions are controlled by the PCM.
Fuel pump relay-pcm output. Idle air control (iac) motor-pcm
output. Radiator fan relay-pcm output
Other materials:
General information. Description and operation. Diagnosis and testing
General information
Introduction
An electrically heated rear window defogger and
electrically heated outside rear view mirrors are
available factory-installed options on this model.
Refer to 8W-48 - Rear Window Defogger and 8W-62 -
Power Mirrors in Group 8W - Wiring Diagrams for
complete circ ...