Wagoneer L4-150 2.5L VIN E TBI (1990)
Idle Speed/Throttle Actuator - Electronic: Adjustments
This adjustment is only required after the ISA motor has been replaced, and is only used to establish the initial position of the actuator.
NOTE: An ISA Exerciser Tool (Part No. Ele. AB.99) is required to successfully complete the adjustment of the ISA motor. Slight modification
to the ISA Exerciser Tool (Part No. Ele. AB.99) connector may be required so that it can be connected to the ISA motor. Use a hobby
knife, and cut grooves in the casing of terminal (A) that match the grooves in the terminal casing of terminals (D) and (B).
1.
Disconnect and remove the air inlet bonnet.
2.
Start the engine and allow it to reach normal operating temperature.
3.
Turn air conditioning to OFF position.
Diagnostic Connector Identification
4.
Connect a tachometer across diagnostic connector D1 terminals 1 and 3.
5.
Disconnect the Idle Speed Actuator (ISA) electrical connector from the motor.
6.
Connect the ISA Exerciser Tool (Part No. Ele. AB.99) to the ISA motor.
7.
Using the Exerciser Tool, extend the ISA plunger fully.
Idle Speed Actuator (ISA) Motor Adjustment
8.
Turn the Adjustment screw, while watching the tachometer, until the engine speed is 3500 rpm.
9.
Disconnect and remove the ISA Exerciser Tool (Part No. Ele. AB.99) and connect the ISA electrical connector. Idle speed should return to
normal after a few seconds.
10.
Re-install air inlet bonnet.
