TPS Sensor Voltage

[90gtconvert]

I am having a problem. I was trying to check the voltage on my TPS semsor and I kept getting 0 VDC. I know that optimal voltage for NA motor is between .996 and .999 VDC. I checked the voltage of the positive supply and it was reading 5 VDC which is what it should be. I tried rotating the sensor without the screws bolted down and I still got nothing. Any ideas why I am getting 0 VDC and what might fix my problem and by the way, the TPS I have is brand new.Thanks.

 

[HISSIN50]

the wires can be hard to pierce. otherwise, i would check each one, one at a time. have you tried checking the ground wire and signal wire independantly?

good luck.

 

[TrickStang37]

your not gonna get any difference being that close to 1 volt.

 

[90gtconvert]

I pierced the wires fine. I did check them independently and the green wire (signal wire) is reading 5 VDC when grounded to the battery, as it should, and the ground is reading no resistence when connected to the battery. I know that there is not a lot of difference between .996 VDC and .999 VDC, but I get 0 VDC when I check it. My meter that I use is accurate to the ten thousandths of a decimal. I just can't figure out why I am getting nothing. My old TPS was doing the same thing, so that is why I replaced it with a new one, but the new one is still reading 0 VDC.

 

[HISSIN50]

and the ground is reading no resistence when connected to the battery. I just can't figure out why I am getting nothing. My old TPS was doing the same thing, so that is why I replaced it with a new one, but the new one is still reading 0 VDC.

so you know you have 5 volts ref voltage and you have ground (when you said no resistance, you meant very little resistance, right?). so what happens if you use the sensor's ground to check the 5 volt signal? do you see 5 volts?

 

[PNY PWR]

You have the key on?

 

[jrichker]

Start from the beginning: Note that all resistance checks must be made with the ignition switch off.

Orange/white wire = +5 volts VREF from computer.
Dark Green/green wire = TPS signal output. The voltage measured between this wire and the black/white signal ground will increase as the throttle opens.

Black/white wire = signal ground from computer. There should be less than 1 ohm between this wire and the battery negative post.

The following conditions are possible:
1. No +5 volt VREF on orange/white wire- look for bad connections or broken wiring in the engine harness & the 10 pin connector.

2. Green wire always shows 5 volts - bad connection or broken wiring in the engine harness & the 10 pin connector.

3. Green wire always shows 0 volts - missing VREF or missing ground, wires not probed to make good connection for DVM.