Idle Tracking Switch
Thread Starter
Senior Member
Joined: Aug 2009
Posts: 11,992
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From: Washington D.C.
Vehicle: Hyundai Tiburon FX
So I found out what that "push" switch was connected the main harness to the throttle in my Revision A. It's electronic idle. On non-Rev A's it's manual idle, a screw that adjusts throttle limit. Mine doesn't have any sort of throttle adjustment at all. Instead there's a button on which the throttle pulley pushes that sends a signal to the ECU telling it to instantly go to 1000RPM.
Crazy stuff...
Crazy stuff...
Thread Starter
Senior Member
Joined: Aug 2009
Posts: 11,992
Likes: 0
From: Washington D.C.
Vehicle: Hyundai Tiburon FX
It's called an Idle Tracking Switch.
the pulley is pushing on the button. it is released when pulley open. i'm not sure i can get rid of this. it's important.
Here you can see it as well, and the other one for a 2001 tiburon. none of you guys had this problem?
QUOTE
Based on the input signals from the system's sensors, the ECU increases the curb idle speed if the coolant is below a specific temperature, if a load (such as air-conditioning. transmission, power steering) is placed on the engine, or when the vehicle is operated above a specific altitude.
During closed choke idle, the fast-idle cam holds the throttle blade open enough to lift the throttle linkage off the ISC plunger. This allows the ISC switch to open so the ECU does not monitor idle speed. As the choke spring allow the fast-idle cam to fall away and the throttle return to the warm idle position, the ECU notes the still low coolant temperature and commands a slightly higher idle speed.
As the engine warms up, the plunger is retracted by the electronic control module. If the A/C compressor is turned on, the ECU extends the plunger a certain distance to increase engine idle speed to compensate for the added load. When the throttle is opened and the lever leaves contact with the plunger, an idle tracking switch (ITS) in the end of the plunger signals the ECU. The electronic control module then fully extends the plunger where, upon contact with the lever (during acceleration), it acts as a dashpot, slowing the return of the throttle lever. When the engine is shut down, the plunger retracts, preventing the engine from dieseling. It then extends for the next engine startup.
In some systems, if the engine starts to overheat, the ECU commands a higher idle speed to increase coolant flow. Also, if system voltage falls below a predetermined value, the ECU commands a higher idle speed to increase alternator speed and output.
During closed choke idle, the fast-idle cam holds the throttle blade open enough to lift the throttle linkage off the ISC plunger. This allows the ISC switch to open so the ECU does not monitor idle speed. As the choke spring allow the fast-idle cam to fall away and the throttle return to the warm idle position, the ECU notes the still low coolant temperature and commands a slightly higher idle speed.
As the engine warms up, the plunger is retracted by the electronic control module. If the A/C compressor is turned on, the ECU extends the plunger a certain distance to increase engine idle speed to compensate for the added load. When the throttle is opened and the lever leaves contact with the plunger, an idle tracking switch (ITS) in the end of the plunger signals the ECU. The electronic control module then fully extends the plunger where, upon contact with the lever (during acceleration), it acts as a dashpot, slowing the return of the throttle lever. When the engine is shut down, the plunger retracts, preventing the engine from dieseling. It then extends for the next engine startup.
In some systems, if the engine starts to overheat, the ECU commands a higher idle speed to increase coolant flow. Also, if system voltage falls below a predetermined value, the ECU commands a higher idle speed to increase alternator speed and output.
the pulley is pushing on the button. it is released when pulley open. i'm not sure i can get rid of this. it's important.
Here you can see it as well, and the other one for a 2001 tiburon. none of you guys had this problem?
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Joined: Feb 2009
Posts: 11,732
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From: Leesville, Louisiana
Vehicle: 2001 Hyundai Tiburon
That's interesting to say the least. Is there a wire that comes off of it? The other side of it looks kinda like the adjustment cover that came on mine in the first place.
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Joined: Dec 2002
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From: Vegas, Baby, Vegas!!!
Vehicle: '14 Ford F-150
QUOTE (DTN @ Oct 3 2008, 09:57 PM)
those are not beta1A engines either. They are beta1
The '96 Elantra is. Had the same motor as the '97 Tib. I even had to remove the EVAP canister to fit my CAI (the REV A CAI install DIY on this forum was made by me). No button on my TB.
