Needing help with TP Switch - ZR-1 Net Registry Forums

Route 66 · 03-15-2012

I screwedup! I took the TPS off when I replaced the injectors. Big mistake. I tried to put it back where I thought it was located. I guess I didn't get it in the right place. because Im getting a falt code for the TPS.
From reading the repair manual I will need to take it somewhere for repair or buy a Tech I and do it myself. So at this time Im looking to buy the tool I will need to put it back so the system will get the proper voltage. The car is a 93ZR1. Is there anyone here that has made this repair and what tools you have used?

You advice would be greatly appreciated!...Thanks...E

bdw18_123 · 03-15-2012

I adjusted my TPS with a common digital volt meter and some sharp metal pins to pierce the wires with to attach the DVM leads to. You have to have the TPS connector connected for this adjustment. I believe the proper voltage is around .54 volts. You need the key in the on position also (engine off) to do this adjustment. You loosen the 2 bolts like you did already, then slowly twist the sensor either way until the DVM reads the correct voltage. Then tighten the bolts back down without moving the sensor again.

There are 3 wires, but you only need to tap into two of them, but I can't remember off the top of my head which two you need. Maybe someone else that knows will chime in.

Route 66 · 03-15-2012

Thank you that sounds great. I thought I might have to spend another few hundred on a tech I or something. I've got a good volt meter, now If I can find which wires to tap into....

VetteMed · 03-15-2012

There's no reason to pierce any wires.

The connector for the TPS can be partially disassembled for adjustment purposes.

Unplug the connector from the TPS.
Using a small flat-bladed screwdriver, flip the cover back from over the end where the wires enter the connector body.
Using a small pick or fine flat bladed screwdriver, gently pull back the three rubber grommets that surround the wires as they enter the connector body.
Plug the connector back in to the TPS.

You can now use your standard DVM leads to probe the connector, without piercing any insulation. If I remember correctly, it's the top and middle leads that you need to measure across. I think the bottom one is the 5V reference.

I will go check my diagrams to confirm.

VetteMed · 03-15-2012

On a 91, and possibly other years, the wire colors are Dark Blue and Black. Black is ground, Dark blue is the voltage the ECM is seeing. The third wire should be the 5V reference signal (Gray, I think).

Z51JEFF · 03-15-2012

Mid America sells the adapter to make this easier or as stated you can get some wires into the plug to get the reading you need.Its possible to get the switch back on the car and dial it in by ear,idle will move around but when I did this I didnt get a code.Did you get the tab in the switch lined up correctly?Ive set mine with the exposed wire method but I do have the adapter from Mid America as well.This was done on a 91.

Pete · 03-15-2012

Just do the blue wire on the TPS and any good ground.

Basicly take your volt meters Red lead to the blue wire at the TPS the Black lead from your volt meter to any good ground.

Pete

VetteMed · 03-15-2012

Quote:

Originally Posted by Pete

Just do the blue wire on the TPS and any good ground.

Basicly take your volt meters Red lead to the blue wire at the TPS the Black lead from your volt meter to any good ground.

Pete

Good point, no reason to mess with 2 wires on the connector when just the one will do the same thing.

Route 66 · 03-15-2012

YOU GUYS HAVE BEEN A GREAT HELP TO ME!...THANK YOU!

mike100 · 03-15-2012

I keep a couple of paper clips and safety pins in the tool box because, if careful, you can slip them under the rubber GM weatherpack wire seal and touch the metal terminal. then use a clip lead to attach the pin to the meter leads...hands free at that point.

03-15-2012	#1
Route 66 Join Date: Dec 2006 Location: Paris Texas Posts: 182	Needing help with TP Switch I screwedup! I took the TPS off when I replaced the injectors. Big mistake. I tried to put it back where I thought it was located. I guess I didn't get it in the right place. because Im getting a falt code for the TPS. From reading the repair manual I will need to take it somewhere for repair or buy a Tech I and do it myself. So at this time Im looking to buy the tool I will need to put it back so the system will get the proper voltage. The car is a 93ZR1. Is there anyone here that has made this repair and what tools you have used? You advice would be greatly appreciated!...Thanks...E

03-15-2012	#2
bdw18_123 Join Date: Apr 2009 Location: Prather, CA Posts: 809	Re: Needing help with TP Switch I adjusted my TPS with a common digital volt meter and some sharp metal pins to pierce the wires with to attach the DVM leads to. You have to have the TPS connector connected for this adjustment. I believe the proper voltage is around .54 volts. You need the key in the on position also (engine off) to do this adjustment. You loosen the 2 bolts like you did already, then slowly twist the sensor either way until the DVM reads the correct voltage. Then tighten the bolts back down without moving the sensor again. There are 3 wires, but you only need to tap into two of them, but I can't remember off the top of my head which two you need. Maybe someone else that knows will chime in. __________________ [IMG]http://i13.photobucket.com/albums/a292/bdw18_123/_zr1netforumsigphoto.jpg[/IMG][B] 1990 Corvette ZR-1 [/B][I] White/Flame Red, #2299, mostly stock, 144K miles.[/I] -Cams timed to the '93-'95 405HP LT5 stock timing. -IAT sensor relocated to below front bumper. -Haibeck hoops installed in airduct. -OBX cat-back exhaust. [COLOR=DarkRed][B](SOLD - December 2012 [/B][/COLOR][COLOR=DarkRed][B]:hello:)[/B][/COLOR] 1993 Corvette Coupe Black/Black, 6-speed (SOLD - October 2009 :hello:) Last edited by bdw18_123; 03-15-2012 at 07:10 PM.

03-15-2012	#3
Route 66 Join Date: Dec 2006 Location: Paris Texas Posts: 182	Re: Needing help with TP Switch Thank you that sounds great. I thought I might have to spend another few hundred on a tech I or something. I've got a good volt meter, now If I can find which wires to tap into....

03-15-2012	#4
VetteMed Join Date: Mar 2009 Location: Orlando, FL Posts: 1,828	Re: Needing help with TP Switch There's no reason to pierce any wires. The connector for the TPS can be partially disassembled for adjustment purposes. Unplug the connector from the TPS. Using a small flat-bladed screwdriver, flip the cover back from over the end where the wires enter the connector body. Using a small pick or fine flat bladed screwdriver, gently pull back the three rubber grommets that surround the wires as they enter the connector body. Plug the connector back in to the TPS. You can now use your standard DVM leads to probe the connector, without piercing any insulation. If I remember correctly, it's the top and middle leads that you need to measure across. I think the bottom one is the 5V reference. I will go check my diagrams to confirm. __________________ 2004 Z06/Z16 LeMans Commemorative Edition 1991 ZR-1 #302 White/Gray (sold) 1991 ZR-1 #1147 Red/Saddle (sold) Last edited by VetteMed; 03-15-2012 at 09:15 PM.

03-15-2012	#5
VetteMed Join Date: Mar 2009 Location: Orlando, FL Posts: 1,828	Re: Needing help with TP Switch On a 91, and possibly other years, the wire colors are Dark Blue and Black. Black is ground, Dark blue is the voltage the ECM is seeing. The third wire should be the 5V reference signal (Gray, I think). __________________ 2004 Z06/Z16 LeMans Commemorative Edition 1991 ZR-1 #302 White/Gray (sold) 1991 ZR-1 #1147 Red/Saddle (sold)

03-15-2012	#6
Z51JEFF Join Date: Dec 2007 Location: Fremont,Ca Posts: 3,036	Re: Needing help with TP Switch Mid America sells the adapter to make this easier or as stated you can get some wires into the plug to get the reading you need.Its possible to get the switch back on the car and dial it in by ear,idle will move around but when I did this I didnt get a code.Did you get the tab in the switch lined up correctly?Ive set mine with the exposed wire method but I do have the adapter from Mid America as well.This was done on a 91.

03-15-2012	#7
Pete Join Date: Dec 2003 Location: Chicagoland,IL Posts: 2,680	Re: Needing help with TP Switch Just do the blue wire on the TPS and any good ground. Basicly take your volt meters Red lead to the blue wire at the TPS the Black lead from your volt meter to any good ground. Pete __________________ '91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage

03-15-2012	#9
Route 66 Join Date: Dec 2006 Location: Paris Texas Posts: 182	Re: Needing help with TP Switch YOU GUYS HAVE BEEN A GREAT HELP TO ME!...THANK YOU!

03-15-2012	#10
mike100 Join Date: Feb 2011 Location: San Marcos CA Posts: 1,802	Re: Needing help with TP Switch I keep a couple of paper clips and safety pins in the tool box because, if careful, you can slip them under the rubber GM weatherpack wire seal and touch the metal terminal. then use a clip lead to attach the pin to the meter leads...hands free at that point.