Wagoneer L6-242 4.0L VIN M FI (1988)
7.
With the engine off, connect the DRB II to the vehicle.
8.
Disconnect the idle speed stepper motor wire harness connector at the stepper motor.
Figure 1
9.
Connect the stepper motor exerciser tool 7558 (Ele. CT01) to the stepper motor. See Figure 1.
10.
Set the parking brake, place the transmission in park or neutral and start the engine.
11.
While observing the RPM on the DRB II, put the exerciser tool control switch in the low position until minimum idle speed is obtained.
12.
With all accessories off, adjust the base engine idle speed to 575 rpm in neutral. This should be accomplished by first adjusting the throttle body
air by-pass screw and then, if necessary, by adjusting the throttle stop screw.
13.
Adjust the throttle position sensor so that the "state display" on the DRB II displays the throttle position sensor as 12-14%. If the TPS percentage
is above or below this number, refer to the TPS adjustment procedures as displayed on the DRB II or as outlined in the appropriate Jeep Service
Manual.
Figure 2
14.
Shut the engine off. Install the clean air tube, remove the stepper motor exerciser control tool, connect the idle speed stepper motor wire connector.
Spray the exposed threads of the throttle stop screw with cleaner and blow dry with shop compressed air. Apply Loctite 209 or equivalent to the
exposed threads. See Figure 2.
POLICY:
Reimbursable within the provisions of the warranty.
