Mirage L4-1597cc 1.6L DOHC Turbo (1989)
1.
Check the ISC Servo motor to verify that sound can be heard from the motor after the ignition switch is turned on (without starting the motor).
2.
If no sound can be heard, the ISC activation circuit must be checked. If the circuit is found to be normal, most likely the malfunction will be found
in the ISC motor or the ECU.
CHECKING THE SERVO
1.
Disconnect the ISC connector and connect the MD998463 special test harness if available.
(Special harness colored clip and harness connector equivalents. 1=red, 2=white, 3=blue, 4=black, 5=green, 6=yellow).
Component Test
2.
Measure the resistance between terminals 2 and 3 and 2 and 1 of the ISC connector.
3.
Measure the resistance between terminals 5 and 4 and 5 and 6 of the ISC connector.
Standard Values:
Terminal 2 to terminals 3 and 1.....................................................................................................................................................28 to 33 ohm @ 68~F
Terminal 5 to terminals 4 and 6.....................................................................................................................................................28 to 33 ohm @ 68~F
Operation Verification
4.
Remove the throttle body and the ISC servo and hold the servo as shown in the image.
Test Connector Procedure