October 16, 200520 yr Hi, The idle air control solonoid valve is made of 2 parts, the upper one and the bottom one. The upper one is *probably* a "Magnet Coil" and the bottom one is a by-pass valve / "butterfly". The upper part is adjustable... The factory service manual says that after cleaing this by-pass valve, you should use a SCANNER to confirm that the duty ratio of this valve is 25-40%. Besides that, the factory service manual also says that after that you should adjust the throttle position sensor to the proper position to make the duty ratio of the by-pass valve 25-40%. My throttle position sensor is adjusted to 0.45 Volt on fully closed throttle. Is there any way to perform a good calibration to the TPS and the IAC without using scanner tool ? Thanks Itzik
October 16, 200520 yr You may be able to measure the duty cycle by using a meter like the Fluke 87 which measures duty cycle. Using a O-scope, you should also be able to figure out the timing cycle.
October 17, 200520 yr What car/engine/year is this for? If you removed the electromagnet top, and put it back exactly where it was taken off from, you should be fine.
October 17, 200520 yr IAC valve is pulse-width modulated by ECU in a wide range, not unlike solenoids in auto transmission. FSM says there's no service adjustment procedure. Looks like if everything is working correctly, ECU will simply compensate for any change in adjustment.
October 17, 200520 yr Author Thanks for all the replys guy's... The car is Legacy 1996 EJ20 N/A (automatic, FWD)... Just wanted to make sure if those parts are adjustable without a scanner. The FSM says that the TPS has to be adjusted after cleaning the IAC valve, i guess there is a connection between ther IAC and the TPS. I think by going 0.5 Volt on fully closed throttle makes the IAC job easyer (less adjustments from the ECU). Itzik
October 17, 200520 yr Is the TPS a 4-wire TPS or 3-wire? If it's a 4-wire TPS, it needs to be adjusted using the following procedure http://www.main.experiencetherave.com:8080/subaru_manual_scans/FSM_Scans/TPS_testing3.jpg If it's a 3-wire TPS, it'll probably be similar or the same as this http://www.main.experiencetherave.com:8080/subaru_manual_scans/2002_WRX_FSM/scans/2002_WRX_TPS_testing.zip
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