See Figure 1
The Idle Speed Control (ISC) motor, which is used in the CFI system, controls idle speed by moving the throttle lever. It regulates airflow to maintain the desired engine rpm for both warm and cold engine idles. An idle tracking switch, integral to the motor, is utilized to determine when the throttle lever has contacted it, thereby signalling the need to control engine rpm. The motor extends or retracts a linear shaft through a gear reduction system. The motor direction is determined by the polarity of the applied voltage.
See Figure 2
- Connect Breakout Box T83L-50EEC-IV, or equivalent, to the ECU wiring harness.
- Use a jumper wire to connect the positive circuit of the ISC motor, test pin 21 , to the positive battery terminal and connect another jumper wire between the negative circuit of the motor, test pin 41 , to battery ground for 4 seconds.
- Reverse the jumper wires, connecting the positive circuit of the ISC motor to battery ground and the negative circuit to battery positive for 4 seconds.
- The ISC motor shaft should extend to greater than 2 in. (51mm) or retract to less than 1.75 in. (44.5mm) from the mounting bracket. If it does not, replace the ISC motor.
REMOVAL & INSTALLATION
- Disconnect the negative battery cable.
- Detach the electrical connector from the ISC motor.
- Unfasten the ISC motor mounting screws and remove the ISC motor.
- Installation is the reverse of the removal procedure.