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1994 Sidekick RPM Question
#21
on a perfect running engine and idle controls work right, and idle control ISC is working
and you set the duty to 50% (using the bleed screw)
if the TPS idle switch is not closed at 0vdc there will be no idle controls.
The ECU must not be stuck in limp-home mode. ( no CEL codes stored or worse live errors)
The ISC must not be bad , stuck or jammed, or , leaking air closed or  dead coil inside.
No huge illegal air leaks.



the bleed as set to 50 % dutycycle on the coil of the ISC,  using scope or duty meter,  180f coolant is hot not 140f ever. the IAC closes at 150f so, that must happen first.
i made this drawing that shows all parts related to idle


[Image: freshair-map.jpg]




the scope here is wrong, cold engine but the hot engine we turn the bleed until the ISC signal is 50/50  , high only 1/2 the time, 200 times  second it pulses

[Image: iac-wave1w.jpg]

vertical scale above is 5vdc per division, the alternator is active ad 14.7vdc so looks like 3 division at 15v.   the IAS is Pulse width modulated, PWM.
http://www.fixkick.com
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Messages In This Thread
1994 Sidekick RPM Question - by tmanstein - 08-31-2019, 11:31 AM
RE: 1994 Sidekick RPM Question - by fixkick - 08-31-2019, 09:57 PM
RE: 1994 Sidekick RPM Question - by tmanstein - 08-31-2019, 11:02 PM
RE: 1994 Sidekick RPM Question - by fixkick - 08-31-2019, 11:30 PM
RE: 1994 Sidekick RPM Question - by tmanstein - 08-31-2019, 11:09 PM
RE: 1994 Sidekick RPM Question - by fixkick - 08-31-2019, 11:43 PM
RE: 1994 Sidekick RPM Question - by fixkick - 08-31-2019, 11:58 PM
RE: 1994 Sidekick RPM Question - by tmanstein - 09-04-2019, 05:57 AM
RE: 1994 Sidekick RPM Question - by fixkick - 09-04-2019, 07:04 AM
RE: 1994 Sidekick RPM Question - by tmanstein - 09-05-2019, 10:52 AM
RE: 1994 Sidekick RPM Question - by fixkick - 09-05-2019, 11:41 AM
RE: 1994 Sidekick RPM Question - by tmanstein - 09-09-2019, 04:22 AM
RE: 1994 Sidekick RPM Question - by fixkick - 09-09-2019, 09:05 AM
RE: 1994 Sidekick RPM Question - by tmanstein - 09-12-2019, 12:37 PM
RE: 1994 Sidekick RPM Question - by fixkick - 09-12-2019, 08:58 PM
RE: 1994 Sidekick RPM Question - by fixkick - 09-12-2019, 09:10 PM
RE: 1994 Sidekick RPM Question - by tmanstein - 09-13-2019, 05:05 AM
RE: 1994 Sidekick RPM Question - by fixkick - 09-13-2019, 07:17 AM
RE: 1994 Sidekick RPM Question - by tmanstein - 09-13-2019, 08:30 AM
RE: 1994 Sidekick RPM Question - by fixkick - 09-13-2019, 10:21 PM
RE: 1994 Sidekick RPM Question - by fixkick - 09-13-2019, 10:41 PM
RE: 1994 Sidekick RPM Question - by fixkick - 09-13-2019, 11:11 PM
RE: 1994 Sidekick RPM Question - by tmanstein - 09-18-2019, 02:29 AM
RE: 1994 Sidekick RPM Question - by fixkick - 09-18-2019, 03:18 AM

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