JEEP CHEROKEE 1988 Service Service Manual

Fig. 18: Chart 4-F - System Operational Test (Cont.)

Fig. 19: Chart 4-G - System Operational Test (Cont.)

Fig. 20: Chart 4-H - System Operational Test (Cont.)

Fig. 21: Chart 4-I - System Operational Test (Cont.)

Fig. 22: Chart 4-J - System Operational Test (Cont.)

Fig. 23: Chart 4-K - System Operational Test (Cont.)
Fig. 24: Chart 5 - Basic Engine Test

Fig. 25: Chart 6-A - Man. Trans. Up-Shift Test

Fig. 26: Chart 6-B - Man. Trans. Up-Shift Test (Cont.)
REMOVAL & INSTALLATION

THROTTLE BODY ASSEMBLY
Removal
1) Remove throttle return spring, throttle cable and cruise
control cable, if equipped. Disconnect wiring harness connector from
injector, WOT switch, and ISA motor. Remove fuel supply and return
pipes from throttle body.
2) Identify and tag vacuum hoses for installation later.
Disconnect vacuum hoses from throttle body assembly. Remove throttle
body-to-manifold retaining nuts from studs.
3) Remove throttle body assembly from intake manifold. If
being replaced, transfer ISA motor and WOT switch and bracket
assembly to new throttle body.
Installation
To install, reverse removal procedure using a new gasket
between components. Adjust ISA motor and WOT switch.
FUEL INJECTOR
Removal
Remove air cleaner assembly, injector wire connector, and
injector retainer clip screws. Using a pair of small pliers, gently
grasp center collar of injector (between electrical terminals), and
carefully remove injector with a lifting and twisting motion. Note
back-up ring fits over upper "O" ring.
Installation
1) Lubricate new lower "O" ring with light oil and install
in housing bore. Lubricate new upper "O" ring with light oil and
install in housing bore. Install back-up ring over upper "O" ring.
2) Position new injector in fuel body, and center nozzle in
lower housing bore. Seat injector with a pushing and twisting motion.
Align wire connector terminals properly. Install retainer clip and
screws. Connect injector wire connector.
FUEL PRESSURE REGULATOR
Removal
Remove 3 retaining screws, securing pressure regulator to
fuel body. After noting location of components for reassembly
reference, remove regulator assembly.
Installation
Position pressure regulator assembly with a new gasket.
Install 3 retaining screws, securing regulator to throttle body.
Adjust regulator. Operate engine and inspect for leaks.
IDLE SPEED ACTUATOR, MOTOR & WIDE OPEN THROTTLE SWITCH
NOTE: Closed throttle (idle) switch is integral with ISA and motor
assembly.
Removal
1) Remove air cleaner assembly. Disconnect throttle return
spring, throttle cable and cruise control cable, if equipped.
Disconnect wiring harness connector from ISA motor and WOT switch.
2) Remove ISA motor and WOT switch bracket from throttle
body. Remove motor-to-bracket retaining nuts. See Fig. 23. Do not
remove nuts from motor studs.
CAUTION: Do not attempt to remove ISA motor attaching nuts without

using a backup wrench on stud nuts. ISA motor internal
components may be dislodged if studs disengage and motor
cap comes off.
Fig. 27: ISA Motor and WOT Switch Removal
Bracket assembly is mounted on throttle body unit.
3) To remove ISA motor from bracket, place backup 8 mm open
end wrench on ISA motor stud nuts to prevent studs from turning.
Grind wrench until thin enough to fit between motor and bracket.
Remove ISA motor attaching nuts. Remove 2 WOT switch-to-bracket
screws. Remove WOT switch.
Installation
1) Install new WOT switch on bracket and tighten 2 screws.
Install ISA and motor on bracket. Install motor-to-bracket retaining