When adjusting tps voltage which wire do I check the voltage on?

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1988 Camaro RS
2.8L five speed
Money pit from hell!!

1988 Camaro
2.8L automatic
t-tops
160* THERMO
Rapid fire plugs

 

Check out this link

http://www.sc3gfb.org/resources/tps.html

 

If you want some pics, click here: TPS

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'87 Trans Am
S/D TPI retrofit including functional PassKey,
22# injectors,
Whatever chip I feel like burning,
JET AFPR, Ported Plenum,
TB Coolant Bypass, Custom Cold Air,
SSM SFC, KYB Shocks, Boxed LCAs, Wonder Bar,
8mm Accel wires,
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16" GTA rims,
Corvette Servo,
-->14.97 @ 94.9 MPH<--

'97 Bonneville SSE

 

I was going to mention the tech article here (at https://www.thirdgen.org/newdesign/tech/tpimod2.shtml ) , but I noticed it doesn't say which wires to connect the voltmeter to. The original article in Hot Rod had a picture next to it that showed the detail...


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
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Looking at the TPS installed on the TB you use the top and middle wire.

The lower wire is a reference voltage wire and isn't used for setting the TPS voltage.

It doesn't matter which wires your voltmeter leads connect to; either positive to the top wire or negative to the top wire. If you connect it one way you get a positive reading on your voltmeter and if you connect it the other way your digital voltmeter will just show a - (negative) sign before the reading.

The top wire is the one you'd connect the negative voltmeter wire to and the center wire gets the positive.

The lower wire can be used to check the reference voltage, which should be 5 volts.

Jake

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1986 Corvette Coupe, 415 CID, Edelbrock 6073s, ZZ9

[This message has been edited by JakeJr (edited March 02, 2001).]

 

I've got a question about the info on that link about resetting the IAC that says to start the engine with the jumper wire (A&B on the ALDL) still connected.

The references I've seen say to remove this jumper wire/paper clip before starting the engine.

It's my understanding that inserting the jumper wire into the A&B terminals of the ALDL causes the IAC pintle to fully extend (close of the air passage), thus establishing a new reference point for the ECM to set IAC counts.

So once the IAC pintle has been fully extended (that's why the 30 seconds), the jumper has done it's job, so the IAC connector is then unplugged and min idle is set.

Has anyone else come across any other source saying to leave the jumper in place on the ALDL when starting the engine?

I'm concerned that this my damage the ECM.

Jake



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1986 Corvette Coupe, 415 CID, Edelbrock 6073s, ZZ9

 

Dupe, sorry

Jake

[This message has been edited by JakeJr (edited March 02, 2001).]

 

Thanks for the links. The ALDL is the connector pluged into the IAC correct?

 

The ALDL is in the driver compartment. Right about where your right knee would be. It has a bunch of pins in the connectors, the tech article can help you better. It's the one that tells you how to check your own codes.

 

the illistration has the pins numbered. Is A and B pins 1 and 2