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digital multimeter trouble

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Old May 19, 2004 | 12:20 PM
  #1  
mory's Avatar
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From: South Central Los Scandolus, CA
Car: 89 camaro
Engine: 2.8L V6
Transmission: 700R4
digital multimeter trouble

i just got a multimeter from autozone and im confused on how to use it. i need to set my TPS 2 the correct thing and i dont know the number the TPS is suppose 2 be at. where at on the DMM am i suppose to start at? the directions in the manaul they give i cant understand.:confused the car is a 2.8 89 camaro. thanks dudes
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Old May 19, 2004 | 05:08 PM
  #2  
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From: conway, s.c.
Car: 1989 Iroc-Z
Engine: 5.7L TPI
Transmission: 700R4
Hello Mory,

Don't feel bad about not understanding the multimeter at first. I don't know which meter you bought. if it is a digital multimeter or analog meter it will have symbols around the ****. The first two symbols should be a V with marking above them. The first one with a wavy line is for Volts Alternating Current (VAC), you don't use it. The second one has a solid line and a dotted line over it, this is for Volts Direct Current(VDC) and is the one you want to use. The correct voltage to set the TPS at is .46 to .62 volts DC. You measure the voltage by back probing the top and center pin on the TPS connector. Top pin is negative and center pin is positive. Loosen the two screws securing the TPS to the throttle body and move it up or down to adjust it to the correct voltage. Tighten the two screws and recheck your setting. Don't over tighten the screws or the TPS will bind. This is all done with the key in the "ON" position.
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Old May 20, 2004 | 08:05 AM
  #3  
mory's Avatar
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From: South Central Los Scandolus, CA
Car: 89 camaro
Engine: 2.8L V6
Transmission: 700R4
thanks dude. i went yeasterday 2 do this and it didnt work. i set the DMM to 20 volts and got no reading. the book says to check that sensor at the ohms position at 20k. if the book is right wich i dont belive, what reading should i get at 20k? or am i doing this stuff wrong? mind u i get 0.00 when i set it at volts and try backprobing.
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Old May 20, 2004 | 04:08 PM
  #4  
dankhound's Avatar
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From: Bloomingdale,IL
Car: 91 RS
Engine: 305 Tbi (L03)
Transmission: 700r4
Make sure when try to get readings you have the key in the on position or else you will get 0 volts to the sensor. While the resistance metod does work you best bet is to use the voltage metod provided by trickster.
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Old May 20, 2004 | 05:44 PM
  #5  
mory's Avatar
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From: South Central Los Scandolus, CA
Car: 89 camaro
Engine: 2.8L V6
Transmission: 700R4
good lookin out. ill get backwith u to let u know what happens
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Old May 20, 2004 | 11:16 PM
  #6  
Dave Y's Avatar
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From: Detroit, Michigan
Car: 04 Xtreme Blazer
Engine: 4.3L V6
Transmission: 4L60E
if possible , set the meter to 2 volts DC
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Old May 21, 2004 | 12:59 PM
  #7  
mory's Avatar
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From: South Central Los Scandolus, CA
Car: 89 camaro
Engine: 2.8L V6
Transmission: 700R4
i know u guys are right. but here is my problem i tried it again and im geting 0.00 reading on the DC par of the DMM. Im setting the DMM to 20v.im doing somthing wrong. im my Haynes manual it says that there is suppose to be 3 jumper wires conected to. im only using the 2 leads that came with it and im putting them into the TPS top and center part. based on this can u see what im doing wrong. am i suppose to have a third lead that gose onto somthing els?
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Old May 21, 2004 | 01:14 PM
  #8  
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From: conway, s.c.
Car: 1989 Iroc-Z
Engine: 5.7L TPI
Transmission: 700R4
The third wire is the signal wire to the ECM from the TPS. Do you have the TPS connected to the wire harness and the key turned to the "ON" position when you are doing this? Also, set the voltage a little lower like Dave Y has suggested. 20 volts is too high a setting.
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Old May 21, 2004 | 03:53 PM
  #9  
mory's Avatar
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From: South Central Los Scandolus, CA
Car: 89 camaro
Engine: 2.8L V6
Transmission: 700R4
is that 2m volts? no i disconect the conector from the TPS and then i do it.is it suppose to be conected? hope im not getting on u guys nerves. but can someone send me a pic with where im suppose 2 set the DMM. so i do need a third lead then right? can somone send me a diagram on the procedure or am i asking 2 much? im just the new kid on the block trying to learn from the pros.:hail: :hail: :hail:

Last edited by mory; May 21, 2004 at 03:58 PM.
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Old May 21, 2004 | 04:21 PM
  #10  
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From: conway, s.c.
Car: 1989 Iroc-Z
Engine: 5.7L TPI
Transmission: 700R4
okay mory,

Yes the wire harness to the TPS must be connected for you to get a reading and the key must be in the "ON" position for it to get power. Now, I am sending a picture here of where you put the leads for testing the TPS. Just disregard the fact that there is not a harness connected in this picture. I don't know what type of meter you have from auto zone, but please read the instructions for how to use it. I am saying this not to be derogatory to you, but so you will have a better understanding of how to read the meter and understand what we are telling you. Getting on our nerves, nyahhh! We've got a couple left somewhere Also, you do not need a third connector for that bottom wire even though it says 3 jumper wires in that picture..
Attached Thumbnails digital multimeter trouble-1q86.gif  

Last edited by Trickster; May 21, 2004 at 04:24 PM.
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Old May 21, 2004 | 05:38 PM
  #11  
mory's Avatar
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From: South Central Los Scandolus, CA
Car: 89 camaro
Engine: 2.8L V6
Transmission: 700R4
ur the f.....g man trick good lookin out 4 me. thanks 4 being patient w/me. 1 last question. if the connector is connected, how do i put the leads in?:hail:

Last edited by mory; May 21, 2004 at 05:41 PM.
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Old May 21, 2004 | 05:45 PM
  #12  
Trickster's Avatar
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From: conway, s.c.
Car: 1989 Iroc-Z
Engine: 5.7L TPI
Transmission: 700R4
Take a paper clip and stick it in the back of the connector and put the probes on those or try sticking the probes in the back of the connector. Either way works.
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Old May 21, 2004 | 05:49 PM
  #13  
mory's Avatar
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From: South Central Los Scandolus, CA
Car: 89 camaro
Engine: 2.8L V6
Transmission: 700R4
i love u and all the othe guys:hail: . now i can move on with this. ill probably never go 2 a shop without yalls advice first. thanks trick and everyone.:lala: :lala: :lala: :lala:
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