Adjust TPS need help please

[gerzen]

hi, i have a problem, yesterday i try to adjust my TPS, but i can´t, i have an 97 explorer 65 mm TB whit his TPS, i try to adjust at .98 or .99, so i conect my DMM the black wire to a good ground and the red one to the green TPS wire, y try to set at .98 so i need to enlarge the holes of the TPS for get the rigth number, but when i set it at .99 the read in my DMM doesn´t keep steady the read stay one or two second at .99 and then goes to 1.03 one second and jump to 1.07, two or three second and goes again at .99, and then another two or three seconds and repet the all variation, i know is not a bad TPS sensor because i buy a new one and the variation is the same using the two sensor´s, i run a KOEO and the 96 code apears, thats sayd that the secondary circuit of the fuel pump is failure, what that means? that code has to do whit my TPS problem? its normall this variation in my TPS, o by the way i know to that my DMM is in good shape because i adjust the TPS of a 89 stang that car have the stock TB and TPS, so the .99 read doesn´t move, what is my problem??

i really lost here, please any help i would be apreciated

Thanks

 

[jrichker]

Setting the TPS: you'll need a good Digital Voltmeter (DVM) to do the job. Set the TPS voltage at .5- 1.1 range. Because of the variables involved with the tolerances of both computer and DVM, I would shoot for somewhere between .6 and 1.0 volts. Unless you have a Fluke or other high grade DVM, the second digit past the decimal point on cheap DVM’s is probably fantasy.

Since the computer zeros out the TPS voltage every time it powers up, playing with the settings isn't an effective aid to performance or driveablity. The main purpose of checking the TPS is to make sure it isn't way out of range and causing problems.

The Orange/White wire is the VREF 5 volts from the computer. You use the Dark Green/Lt green wire (TPS signal) and the Black/White wire (TPS ground) to set the TPS. Use a pair of safety pins to probe the TPS connector from the rear of the connector. You may find it a little difficult to make a good connection, but keep trying. Put the safety pins in the Dark Green/Lt green wire and Black/White wire. Make sure the ignition switch is in the Run position but the engine isn't running.

Here’s a TPS tip I got from NoGo50

When you installed the sensor make sure you place it on the peg right and then tighten it down properly. Loosen the back screw a tiny bit so the sensor can pivot and loosen the front screw enough so you can move it just a little in very small increments. I wouldn’t try to adjust it using marks.

(copied from MustangMax, Glendale AZ)

A.) Always adjust the TPS and Idle with the engine at operating temp. Dive it around for a bit if you can and get it nice and warm.

B.) When you probe the leads of the TPS, do not use an engine ground, put the ground probe into the lead of the TPS. You should be connecting both meter probes to the TPS and not one to the TPS and the other to ground.

C.) Always reset the computer whenever you adjust the TPS or clean/change any sensors. I just pull the battery lead for 10 minutes.

 

[gerzen]

thanks for your help maybe because im taking the ground of the engine and no in the TPS the reads is jump up and down tomorow im going to try conecting the red wire of my DMM at the TPS signal and the black one at the ground IN the TPS and see what happens thanks again

 

[gerzen]

thanks, yesterday i finally solve the problem like you said, i took the ground at the TPS connector and finally have an steady read, i adjust at .99.

thanks ofr all your help