Topaz FWD L4-140 2.3L CFI (1987)
3.
Check to see if the throttle lever is in contact with the idle tracking switch (ISC motor).
a.
If there is contact, apply a light upward force on the throttle lever against the tip of the ISC motor. If the ISC motor now controls the throttle
RPM down to the correct Adaptive/"Learned" idle speed then the throttle lever may be bent or hard stop requires adjustment. The throttle
body may have to be replaced.
NOTE:
Before replacing the throttle body on ATX vehicles, make sure the TV rod adjustment with Idle Speed Control (ISC-DC motor) is
retracted. Refer to TSB 86-3-20.
b.
If there is no contact, determine if the throttle stop adjusting screw (hard stop) is holding the throttle plate open (high RPM). If held open, the
hard stop screw must be adjusted. Retract the ISC motor and reset hard stop in the exact sequence shown below.
NOTE:
The hard stop setting when properly set does not in any way determine idle speed ("learned" or fast idle).
Retract the ISC Motor:
^
Shut engine Off and remove air inlet tube from throttle body. In the engine compartment, find the Self-Test connector and Self-Test input
connector.
Figure 6
^
Connect a jumper wire between the SelfTest input connector and the signal return pin on the Self-Test connector, Figure 6.
^
Turn the ignition key to the "Run" position. DO NOT START ENGINE.
^
The ISC plunger will retract. Wait until plunger is fully retracted (about 5 to 15 seconds).
NOTE:
If plunger does not retract, refer to EEC IV diagnostics.
^
Return the ignition key to the "Off" position; wait 10 to 15 seconds.
^
Remove the jumper wire.
Figure 7
