Where's the damn idle switch?
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- Knowledgeable
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Where's the damn idle switch?
I finally ended up washing my car yesterday and decided to spray down my engine bay. The only problem is that when I started the car, I got two CE codes. 22 and 42. My question is, where's the idle switch (code 42)?
A 12 year old car has A LOT of chewed up wiring
A 12 year old car has A LOT of chewed up wiring
[url=http://www.angelfire.com/md3/91turbolegacy/images/On_the_Lawn.jpg]1991 Legacy Turbo (RIP)[/url]
[url=http://www.angelfire.com/md3/91turbolegacy/images/Summer_Car_Wash3.jpg]2000 Celica GT-S[/url]
[url=http://www.angelfire.com/md3/91turbolegacy/images/Summer_Car_Wash3.jpg]2000 Celica GT-S[/url]
idle switch location
boostjunkie the haynes manual sez that our year model 90-94 have an idle switch in the throttle position sensor......but it sounds like u got some spray that got into a connector. i was cleaning around the turbo and back of the motor and had things bagged but i still managed to get something wet that should not have gotten wet and now i get check engine light as soon as i crank it up. after it warms up and the idle stops being screwy the light goes off the car runs great and no light until the next crankup. i will have to disconnect each coupling and spray them with electric gremlin fixer to remove all the moisture. if u haven't checked the intake forum lately i have the blue subie intake on my car now and have been giving it the runthru.....works better than the other one did and looks a lot better. i will try and post a pic or2 this weekend.
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- quasi-mod-o
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The idle switch code is most likely related to the IAC valve. I got that code when I put mine back together wrong...
I did a de-grease once and sprayed the engine down. Afterwards, I had codes for the O2 sensor, starter switch, purge valve, idle switch and VSS. So yes I know very well how important it is to cover various sensors with plastic bags.
I did a de-grease once and sprayed the engine down. Afterwards, I had codes for the O2 sensor, starter switch, purge valve, idle switch and VSS. So yes I know very well how important it is to cover various sensors with plastic bags.
2000 Subaru Legacy B4 RSK
"Der Wahnsinn ist nur eine schmale Brücke/die Ufer sind Vernunft und Trieb"
*Formerly DerFahrer*
@entirelyturbo on social media, including Facebook, Instagram, Twitter, and TikTok
"Der Wahnsinn ist nur eine schmale Brücke/die Ufer sind Vernunft und Trieb"
*Formerly DerFahrer*
@entirelyturbo on social media, including Facebook, Instagram, Twitter, and TikTok
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- Vikash
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The idle switch is built into the throttle position sensor. It basically tells the ECU when your foot is off the accelerator pedal completely.
You may want to remove the TPS and blast it with compressed air to make sure you dry up any water that may have gotten in there; it could be shorting the idle switch.
You may want to remove the TPS and blast it with compressed air to make sure you dry up any water that may have gotten in there; it could be shorting the idle switch.
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- quasi-mod-o
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Okay, so vrg3, when I screwed up my IAC valve, do you think it pissed off the TPS or something?? Because the IAC only opens when the throttle plate is closed, so if that is messed with, then the TPS is confused...
I do know our cars kinda have a tendency to get 5 sensors angry when only 1 has a problem...
I do know our cars kinda have a tendency to get 5 sensors angry when only 1 has a problem...
2000 Subaru Legacy B4 RSK
"Der Wahnsinn ist nur eine schmale Brücke/die Ufer sind Vernunft und Trieb"
*Formerly DerFahrer*
@entirelyturbo on social media, including Facebook, Instagram, Twitter, and TikTok
"Der Wahnsinn ist nur eine schmale Brücke/die Ufer sind Vernunft und Trieb"
*Formerly DerFahrer*
@entirelyturbo on social media, including Facebook, Instagram, Twitter, and TikTok
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- Vikash
- Posts: 12517
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- Location: USA, OH, Cleveland (sometimes visiting DC though)
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I don't see how the IAC valve malfunctioning could make the ECU believe the idle switch is malfunctioning...
That doesn't mean it can't happen though. Most of the logic the ECU uses to determine whether or not a sensor is trustworthy is rather opaque. It could be using really circuitous methods. For example, it's possible that when idling with the idle switch on, the ECU computes an expected airflow based on the current IAC valve duty cycle, and then if the MAF sensor reads much higher than that expected flow, it throws a code. That basically means that a problem with the IAC valve, idle switch, or MAF could result in any of the three codes.
That doesn't mean it can't happen though. Most of the logic the ECU uses to determine whether or not a sensor is trustworthy is rather opaque. It could be using really circuitous methods. For example, it's possible that when idling with the idle switch on, the ECU computes an expected airflow based on the current IAC valve duty cycle, and then if the MAF sensor reads much higher than that expected flow, it throws a code. That basically means that a problem with the IAC valve, idle switch, or MAF could result in any of the three codes.
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- Knowledgeable
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Thanks for the help, guys. I'll need to check the wiring again. All I know is that the ca was idling really rough, and would even stall out last night.
This morning we got a crapload of rain and I couldn't even start the car!! The starter would turn but the engine wouldn't catch. I checked the fuel pump for activation, and tried fiddling with the wires under the hood. No dice
I hate rain!!
This morning we got a crapload of rain and I couldn't even start the car!! The starter would turn but the engine wouldn't catch. I checked the fuel pump for activation, and tried fiddling with the wires under the hood. No dice
I hate rain!!
[url=http://www.angelfire.com/md3/91turbolegacy/images/On_the_Lawn.jpg]1991 Legacy Turbo (RIP)[/url]
[url=http://www.angelfire.com/md3/91turbolegacy/images/Summer_Car_Wash3.jpg]2000 Celica GT-S[/url]
[url=http://www.angelfire.com/md3/91turbolegacy/images/Summer_Car_Wash3.jpg]2000 Celica GT-S[/url]
the idle switch is in the TPS
Here's a couple scans.
the testing 3 scan is the one you want to pay attention to.
http://www.main.experiencetherave.com:8 ... ns/TPS.jpg
http://www.main.experiencetherave.com:8 ... sting1.jpg
http://www.main.experiencetherave.com:8 ... sting2.jpg
http://www.main.experiencetherave.com:8 ... sting3.jpg
Here's a couple scans.
the testing 3 scan is the one you want to pay attention to.
http://www.main.experiencetherave.com:8 ... ns/TPS.jpg
http://www.main.experiencetherave.com:8 ... sting1.jpg
http://www.main.experiencetherave.com:8 ... sting2.jpg
http://www.main.experiencetherave.com:8 ... sting3.jpg
Last edited by Legacy777 on Thu Aug 21, 2003 4:47 am, edited 2 times in total.
Josh
surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm
surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm
I clean my engine often.
First thing Id do is remove the connector and dry it out. Many of these connections have a rubber seal. Water under high pressure can get it but will never evaporate out.
Take the time to adjust your IDLE switch properly. If you dont it will also effect WOT, even changing the behaviour of the AC clutch disengauging!
First thing Id do is remove the connector and dry it out. Many of these connections have a rubber seal. Water under high pressure can get it but will never evaporate out.
Take the time to adjust your IDLE switch properly. If you dont it will also effect WOT, even changing the behaviour of the AC clutch disengauging!
I just wanted to tell everyone that in this image
http://www.main.experiencetherave.com:8 ... sting2.jpg
You are measuring for .028 connected and .035 open AT PORTION G(bottom right) not the screw with the spring!!! A common mistake
http://www.main.experiencetherave.com:8 ... sting2.jpg
You are measuring for .028 connected and .035 open AT PORTION G(bottom right) not the screw with the spring!!! A common mistake
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- Knowledgeable
- Posts: 1770
- Joined: Mon Dec 16, 2002 3:20 pm
- Location: Owings Mills, MD
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Hehe. I did the screw measuring thing at first and then figured out I had to get to the place behind the throttle body.
[url=http://www.angelfire.com/md3/91turbolegacy/images/On_the_Lawn.jpg]1991 Legacy Turbo (RIP)[/url]
[url=http://www.angelfire.com/md3/91turbolegacy/images/Summer_Car_Wash3.jpg]2000 Celica GT-S[/url]
[url=http://www.angelfire.com/md3/91turbolegacy/images/Summer_Car_Wash3.jpg]2000 Celica GT-S[/url]
Re: Where's the damn idle switch?
I adjusted my TPS on 91 SS last week. Did a real good job feeler gages at that upper screw with spring. All wrong. Looked at the picture and did it wrong. Sure is easy to get at there, though!
Ciper post showed me how. So obvious now, not sure why I did not see that first time.
Ciper post showed me how. So obvious now, not sure why I did not see that first time.