Do a quick in-vehicle test of the ISC for any signs of responsive. Observe your idle speed, then "load" the engine via an accessory (A/C, headlights and or cabin fan of high) and see if there is any idle compensation. If not, I would certainly suspect the ISC of being faulty.
You could further evaluate the signal sent to the ISC with a meter by observing the voltage change at the ISC connections during said test. If no voltage changes (telling the ISC to respond), I'd then suspect the ECU or wiring connections that feed the circuit.
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Do a quick in-vehicle test of the ISC for any signs of responsive. Observe your idle speed, then "load" the engine via an accessory (A/C, headlights and or cabin fan of high) and see if there is any idle compensation. If not, I would certainly suspect the ISC of being faulty.
You could further evaluate the signal sent to the ISC with a meter by observing the voltage change at the ISC connections during said test. If no voltage changes (telling the ISC to respond), I'd then suspect the ECU or wiring connections that feed the circuit.
Good idea.
I did this: turned on the engine, idle=1200 when cold then 600 when warm, put the gear on R or D and the car starts to vibrate, the headlights are ON, I turned ON the dome light and AC, the idle drops down just a little (maybe to 575) then back to 600. The ISC seems to be responding.
I wish I have another ISC and ECU to make the swap-testing
I don't think the ISC is responding - with a/c on the idle rpms should increase - not drop & return to where it was before.
As another example - if you have power steering, turning the wheel with the car stationary should result in the rpm increasing by a few hundred rpm and then dropping back as the powersteering loads up, and the additional load is detected and compensated for.
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93 - 1.3 Suzuki Swift GLX
98 - 1.8 Mitsubishi Pajero iO
98 - 2.0 Suzuki Grand Vitara
I don't think the ISC is responding - with a/c on the idle rpms should increase - not drop & return to where it was before.
As another example - if you have power steering, turning the wheel with the car stationary should result in the rpm increasing by a few hundred rpm and then dropping back as the powersteering loads up, and the additional load is detected and compensated for.
Just did these tests:
Engine cold to warm: starts at 1200 then drop to 650 as it goes warming
Turn AC ON: drops to 600 then immediately rise back to 650 (is it a compensation?)
Turn ALL LIGHTS ON: drops to 550 and stay on 550
Turning the wheel: drops to 450-500 and stay on it, didn't rise when turning the wheen and stay low didn't rise as compensation.
I believe that's a stepper motor IAC, it makes it a little harder to check and it may respond to some extent whilst not responding fully - I would say yours is definitely not responding the way it should.
There are noid light style testers that can be used with stepper motor IACs but I have never need to check a Suzuki one, so I don't know if they come in that connector style.
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93 - 1.3 Suzuki Swift GLX
98 - 1.8 Mitsubishi Pajero iO
98 - 2.0 Suzuki Grand Vitara
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