SES Light wire color (sevice engine soon)

SES Light wire color (sevice engine soon)

Postby grupe [OP] » May 24th 2010, 5:38am

Anyone know what color the wire for the service engine soon light (SES) is that goes to the gauge cluster on a 1990 Astro?
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Re: SES Light wire color (sevice engine soon)

Postby Astroplane » May 24th 2010, 7:06am

Pink provides power and Brown/White will provide ground when requested.
The price of paying attention is cheap considering the alternative.
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Re: SES Light wire color (sevice engine soon)

Postby webcat » May 24th 2010, 7:07am

I think its brown or brown and white
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Re: SES Light wire color (sevice engine soon)

Postby $uperJoe » May 24th 2010, 4:45pm

webcat would you have a similar print out for the 1996 sfi 5.7L? i need to hook up my obd2 port and can not remember what colors were attached to it. its almost emission time for me so i can drive it and need that hooked up

sorry grupe for the side note but i figure its very similar and we dont need two threads on the same thing
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Re: SES Light wire color (sevice engine soon)

Postby grupe [OP] » May 24th 2010, 4:52pm

Okay. I will try these. When i do the paper clip method and jump the White/Black and Black/White wires there is a clicking coming from somewhere on the engine. Sounds like it is coming from the injuectors or the Throttle Position Sensor. Any idea if this should be happenings?

No worries about hijacking the thread. Happens all the time.
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Re: SES Light wire color (sevice engine soon)

Postby Astroplane » May 25th 2010, 7:05am

grupe wrote:When i do the paper clip method and jump the White/Black and Black/White wires there is a clicking coming from somewhere on the engine. Sounds like it is coming from the injuectors or the Throttle Position Sensor. Any idea if this should be happenings?

There should be no clicking sound while retrieving codes. Key ON, engine OFF, Yes? The TPS will not make any noise. You could unplug the injectors and try it again to rule them out. Does the CEL flash codes like it should? This is a factory VIN 'Z' 4.3L? The only other part on the TBI is the Idle Air Control valve. I suppose it could cause a clicking if it is stripped internally and if it is being requested to open/close. Not normal, something is wrong. Try to find this noise.
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Re: SES Light wire color (sevice engine soon)

Postby webcat » May 25th 2010, 11:11pm

$uperJoe wrote:webcat would you have a similar print out for the 1996 sfi 5.7L?

This is what i have right now , when my FSM (repair manual ) arrives in the mail it should have one that blows this one away , i may not have it until about 9 days , i'll keep you updated.
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Re: SES Light wire color (sevice engine soon)

Postby webcat » May 25th 2010, 11:19pm

grupe wrote:Okay. I will try these. When i do the paper clip method and jump the White/Black and Black/White wires there is a clicking coming from somewhere on the engine. Sounds like it is coming from the injuectors or the Throttle Position Sensor. Any idea if this should be happenings?

No worries about hijacking the thread. Happens all the time.

Your probally have the paper clip in the wrong holes , your probally touching the one that makes the IAC on the throttle body go in and out . I think its normal for the IAC to click but i may be wrong about that though.
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Re: SES Light wire color (sevice engine soon)

Postby $uperJoe » May 26th 2010, 6:01am

when your book gets here there are a few other things i would have you look please.

does the pcm need a brake signal from the brake switch?
is there a thermostat output to engauge an electric fan?

im sure ill think of more in days to come so tune in frequently
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Re: SES Light wire color (sevice engine soon)

Postby webcat » May 26th 2010, 6:25am

$uperJoe wrote:when your book gets here there are a few other things i would have you look please.

does the pcm need a brake signal from the brake switch?
is there a thermostat output to engauge an electric fan?

im sure ill think of more in days to come so tune in frequently

Most certainly , I'll let you know when it arrives.
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Re: SES Light wire color (sevice engine soon)

Postby $uperJoe » May 26th 2010, 6:37am

thanks. i have been researching and from what i can gather it would be pin 9 on connector 4 that would be for the fan. i just dont know if the pcm is programed to use those fans or if it has to be turned on (reprogrammed)
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Re: SES Light wire color (sevice engine soon)

Postby grupe [OP] » May 26th 2010, 5:56pm

This is very helpful. I had to dis-assemble my test setup for a while. Once i have the motor mounted in its new home i will continue testing.
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Re: SES Light wire color (sevice engine soon)

Postby webcat » May 29th 2010, 12:09am

$uperJoe wrote:when your book gets here there are a few other things i would have you look please.

does the pcm need a brake signal from the brake switch?
is there a thermostat output to engauge an electric fan?

im sure ill think of more in days to come so tune in frequently

This is what i found so far .
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Re: SES Light wire color (sevice engine soon)

Postby webcat » May 29th 2010, 4:41pm

$uperJoe wrote:when your book gets here there are a few other things i would have you look please.

does the pcm need a brake signal from the brake switch?
is there a thermostat output to engauge an electric fan?

im sure ill think of more in days to come so tune in frequently

does the pcm need a brake signal from the brake switch? no , not what from i see.
is there a thermostat output to engauge an electric fan? none , not what from i see.
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Re: SES Light wire color (sevice engine soon)

Postby $uperJoe » May 29th 2010, 5:13pm

good stuff webcat. i mean great stuff.
thats what i figured about the fan, i was just wondering because i thought the firebirds and such with similar motors had electric fans.
the brake switch thing was a query since i dont know what terminates signal to the cruise control.
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Re: SES Light wire color (sevice engine soon)

Postby webcat » May 30th 2010, 3:23am

Here's a link to the same information but you might be able to read it better , them other pictures i took with my camera because i dont have a scanner.
http://www.lt1swap.com/1996_vortec_5.7/index.htm
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Re: SES Light wire color (sevice engine soon)

Postby Astroplane » May 30th 2010, 7:03am

Black connector, Pin 10, Purple wire for brake signal. If the donor was a truck, it would not have high/low cooling fan control. Choose a temp sender switch and wire it in with a relay.
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