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A/F install help...


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I know we beat this like a dead horse but I looked all over the Trance forum for help and found nothing all the way back to the 15th page.  I've recently acquired an AutoMeter AF and want to install it within the week so is there a page on this somewhere?  I'd like info on where to hook up the gauge electrical (light and such) and signal wire.  Also, where are y'all hooking up the boost gauge light wires?  Mine are both going in the gauge pod.

 

Thanks guys.  and if I can get some concrete answers I'll post a page on the install.

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Installing A/F Meter to 88/89 StarQuest...

 

Posted by Mike C. on January 12th 2001.

That outer, thin wire is a ground wire that shields the inner wire from stray radiation. You MUST NOT allow this wire to contact the inner wire or your signal wire - doing so shorts out the output of the O2 sensor making it useless. I doubt it'll hurt your O2 sensor but neither your A/F guage nor your ECU will see anything from it.

 

The best way to tap into the O2 sensor is to:

1) key out of the ignition, unplug the battery.

2) remove the connectors going to the ECU.

3) near one corner of one the large ECU connector you'll see the O2 shielded wire. There is another shielded wire on the other end of the connecter - actually IN a corner - DON'T USE THIS ONE! That is your tachometer signal to the ECU. Anyway, on the shielded wire for the O2 sensor (it'll have green+red and yellow+black wires on either side of it) tap into the O2 signal at the connector pin. This way, you have the shortest wire possible to your A/F guage and you are well away from the noisy ignition system. You don't need a shielded wire to your A/F guage this way.

 

Posted By: ryan on January 12th 2001

also.....the ECU has a seperate ground signal which goes to the TPS,ISC and coolant temp sensor plus a few other misc things (check your wiring dia,its pin 4 on the ECU I believe). to get an ACCURATE reading on your A/F YOU NEED TO USE THIS GROUND.......this is where I tapped my ground for the A/F, I used the coolant temp sensor. A/F seems to react slightly quicker and now I know its accurate

 

 

Posted By: Pete Yack on January 18th 2001.

Don't cut the Coax wire (the "antenna" wire your talking about) right at the O2 sensor. Instead...route it back to where its not a Coax anymore, and tap it into there. Make sure the O2 sencsor is still hooked up too  heh...Peace

 

 

Posted By: ryan January 24th 2001.

Where are you guys picking up your ground for the A/F meter?? That can also have a lot to do with it........You should be reading off the ECU ground and not the body or battery ground.....

 

My comments...

Looking at the control harness diagram in my 88 Conquest service manual,

The O2 sensor is the shielded white wire which runs to Pin #1 and Pin #11 of the 24 pin connector. Per Mike C's post, use Pin #11 -- it is in the top row, 2nd from the right. Pin #10 is Green with Red Stripe. Pin #12 is Yellow with Black Stripe. Per ryan's post, ground to Pin #4 -- it is the Black wire in the top row, 4th from the left.

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Installing A/F Meter to 85.5/86 StarQuest...

 

I double-checked my 88 wiring diagram. Here is additional info from my 85.5 manual.

 

Looking at the control harness diagram in my 85.5 Starion service manual,

The O2 sensor is the shielded white wire which runs to Pin #11 (wire #22) of the 24 pin connector. Pin #1 (wire #74) is labeled Ignition Coil (-).

 

Per Mike C's post, use Pin #11 (wire #22) -- it is in the top row, 2nd from the right. Pin #10 (wire #24) is Green with Red Stripe. Pin #12 (wire #105) is Yellow with Black Stripe. Per ryan's post, ground to Pin #4 (wire #100) -- it is the Black wire in the top row, 4th from the left.

 

The format used in the 85.5 service manual is different than in the 88. The top/bottoms and left/rights may be reversed, but the wire colors (mentioned above) are the same.

 

My comments...  On the ECU error code connector next to the air can, there are 3 pins -- 1) ECU error code wire 2) ECU ground 3) O2 signal  Why not connect A/F Meter there?

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My comments...  On the ECU error code connector next to the air can, there are 3 pins -- 1) ECU error code wire 2) ECU ground 3) O2 signal  Why not connect A/F Meter there?

 

3 pins on the ECU test connector?  On the early cars, I know the test connector is in the engine bay.  On 87-later cars though it moved to a large connector at the top of the glove box opening.  Several computer modules have test pins on this new mega-test port.  But no O2 wire.  I never knew the O2 wire was available on the earlier model year car ECU test connector.  If you do tap into that pin for an a/f guage you'd have to run shielded (coax) wire from there to the guage.  That's too long for regular wires for such a small signal.  And it's in the electrically noisy engine environment to boot.

 

mike c.

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