idle up

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Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=1953
Printed Date: June 01, 2024 at 5:17 PM

Topic: idle up

Posted By: jmyinc
Subject: idle up
Date Posted: July 14, 2002 at 11:02 PM

Ok what I have is an 89 Toyota corolla. Ive got an aftermarket a/c and when i turn it on I want my rpms to a few hundred. below is an ecu pin out of my car. not sure if it will help but on the "e connector" it has a Vacuum switching valve [Idle up]. My car keeps dieing when i turn on my a/c.Thanks in advance.

4A-GEL Electronic Control Unit (ECU), 88-89 Corolla AE92 GTS US Market, Connector Shown.

Toyota P/N 89661-12390

V Connector

Pin No.	Symbol	Color	Terminal
1
2	VF	R-W	Check connector
3	STA	R-B	Neutral Start Switch (A/T) or Clutch Start Relay (M/T)
4	No. 10	G-R	No. 3, 4 injector
5	E01	BR	Engine ground (Power)
6	S/TH	G-R	Vacuum switching valve (VSV)
7	E1	BR	Engine ground
8	IGT	B	Igniter
9	No. 20	G-Y	No. 1, 2 injector
10	E02	BR	Engine ground (Power)

U Connector

Pin No.	Symbol	Color	Terminal
1	NE	B-R	Engine revolution sensor (Igniter)
2	THG	R-G	ECR Gas Temp. Sensor
3	G+	W	Engine revolution sensor
4	G-	B	Engine revolution sensor
5	IGF	B-Y	Igniter
6	IDL	L	Throttle sensor
7	TEST	L-W	Check connector
8	W	R	Warning light
9	FPU	LG	VSV (FPU)
10	THW	W	Water temp. sensor
11	VTA	R	Throttle sensor
12	VCC	Y	Throttle sensor
13	OX	B	Oxygen sensor
14	E21	BR	Sensor Earth
15	A/C	B-W	A/C Magnet clutch
16
17	HT	R-B	Ox Sensor Heater
18	VISC	B	Vacuum switching valve [Idle up]

T Connector

Pin No.	Symbol	Color	Terminal
1	+B1	B-R	Main relay
2	BATT	R-W	Battery
3	THA	B	Inlet air temp. sensor
4	VS	Y-L	Air flow meter
5	VC	Y-B	Air flow meter
6
7
8	+B	B-R	Main relay
9
10	SPD	V-W	Speedometer
11	STP	G-W	To Cruise Control Computer
12	E2	BR	Sensor earth
13
14

Replies:

Posted By: GlassWolf
Date Posted: July 14, 2002 at 11:13 PM

is the car EFI or carbuerated?
if carb'ed you should be able to just open the throttle a bit and increase the idle RPM that way.. no need to mess with the computer or wiring.

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-GlassWolf
Pioneer Stage-4, Orion, DynAudio, Fi

Posted By: jmyinc
Date Posted: July 14, 2002 at 11:55 PM

its efi. Last year i just upped the idle a bit but when the a/c if off the rpm is so high that the throttle response is crap.

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-Morgan

Posted By: GlassWolf
Date Posted: July 15, 2002 at 5:49 AM

ahhh yeah that makes sense. ugh. oh well just figured it might be a simple fix for ya.. was worth a shot there.
never messed with aftermarket a/c units but I do understand precisely what you're saying in regards to the problem. idle always drops when that compressor kicks in.. drags on the engine trying to spin that pulley.

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-GlassWolf
Pioneer Stage-4, Orion, DynAudio, Fi

Posted By: jmyinc
Date Posted: July 15, 2002 at 6:57 PM

well thanks for the help.

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-Morgan