tried pulling codes with tester light stays on

[westridez]

i bought a code reader from walmart and hooked it up when i try testing it the light just stays on i left it on for 5 minutes still nothin what could it be?

 

[Black1987Stang]

Did you turn the key on run? I have the same one, black and yellow sticker box with little red light and a beeper and a single and diferent group of prongs on top? The first time i hooked it up it was doing that and i was confused then i noticed i had the wrong single wire hookup to it. On my 87 there are the normal self diagnostic hookup and TWO single wire connectors. I had the wrong one hooked up, i think it was for the stock underhood light since now i have an aftermarket hood. One is black and the other is like a gray. Hope this helps.

 

[westridez]

Did you turn the key on run? I have the same one, black and yellow sticker box with little red light and a beeper and a single and diferent group of prongs on top? The first time i hooked it up it was doing that and i was confused then i noticed i had the wrong single wire hookup to it. On my 87 there are the normal self diagnostic hookup and TWO single wire connectors. I had the wrong one hooked up, i think it was for the stock underhood light since now i have an aftermarket hood. One is black and the other is like a gray. Hope this helps.

is the wire im looking for come out of the same harness as the big plug just down further

 

[HISSIN50]

I would run codes by hand to see if you can. good luck.

 

[Black1987Stang]

Yea it comes out of the same harness, its a orangy color wire and a light grey connector. The one you dont want is a black connector and it comes out of a seperate harness so just make sure you use the one that comes out of the same harness as the big plug.

 

[westridez]

im pretty sure thats the one i used but the light just stays on never blinks what could be wrong

 

[SPEED FREAK]

im pretty sure thats the one i used but the light just stays on never blinks what could be wrong

There is a large black connector which is psuedo prism shaped and a small grey square connector with a single wire they both need to be plugged in with the key off. Once they are in there, put the key to the run position and read away.

 

[westridez]

There is a large black connector which is psuedo prism shaped and a small grey square connector with a single wire they both need to be plugged in with the key off. Once they are in there, put the key to the run position and read away.

thats what i did and the light was still on

 

[jrichker]

You may have some wiring problems. Use a DVM or Ohmmeter and measure the resistance between the black/white wire in the lage connector and battery ground. You should see less than .5 ohm.

Note that all resistance tests must be done with power off. Measuring resistance with a circuit powered on will give false readings and possibly damage the meter.

 

[westridez]

You may have some wiring problems. Use a DVM or Ohmmeter and measure the resistance between the black/white wire in the lage connector and battery ground. You should see less than .5 ohm.

Note that all resistance tests must be done with power off. Measuring resistance with a circuit powered on will give false readings and possibly damage the meter.

alright all try that thanks