Direct ground the TPS sensor?

How are you testing ground? Take an INCANDECENT test light connected to battery positive, unplug connector, Gently touch ground pin. If test light lights, you're good.

If not. Plug in, run jumper wire from battery ground, back probe ground wire from the connector that you just plugged in. Attempt to start vehicle and check for codes. If it runs and no codes, you have a bad ground and need to find the "G" location in the manual.

That's as much as I can help right now.

Ok. Chill.

What year? What engine?

What Codes are present right now?

How are you seeing 5.04 and 5.07? A scan tool? Or multi-meter back-probed into connector?

Edit: Also, I'd love to help, but I gave you a sure fire way to test your ground. If you're not going to do what I say, I'm not going to waste my time. That said, If P0123 is your current code, the ground is likely not your issue, but you've got to follow my troubleshooting steps for me to help you.

If you'd rather guess and not test, I'd guess you have a broken wire or bad connection on the signal wire. 5 volts is bias voltage (aka broken wire).

Cbrianroll said:

I had thought about installing new wires from the ECU, my back is jacked up now so I cannot do that until hopefully this weekend…
I have the wiring diagrams…just need to read them and trace the wires back.

Click to expand...

The ground for the tps is shared with many other sensors so you should have other sensor codes if the wire was damaged beyond one of the splices. The signal wire (5 volts) goes into the sensor drops across a resistor to the ground ( 0 volts). A wiper in the tps (signal wire) runs up and down the resistor and changes voltage relative to position. If you have 5v at the reference wire and signal wire the ground wire is open or open internally in the sensor.
Disconnect the battery and check from the pcm signal return wire to the ground on the sensor. It should be less than 5 ohms. You can isolate it by checking other sensors along the circuit and try to isolate where the wire is damaged. Here is the 98 electrical diagram. I did not see a 2.5 vs 4.0 designation.
Take a good look at the harness to see any physical damage or chaffing on engine or body parts.

If that's truly the reading while back-probed with the TPS plugged in AND THE TPS IS A BRAND NEW FUNCTIONING MOPAR SENSOR: Either you have a broken wire, bad signal wire connection at TPS plug or C2 PCM, or you're shorted to voltage. (Even though your TPS is brand new, step one should still be reading resistance through the TPS while sweeping the throttle plate. I'm assuming it's good being that it's brand new, so take that for what it's worth.)

-With Key Off, Disconnect C2 at PCM

-Turn Key On/Engine Off: Disconnect TPS Connector.

-With a multimeter set to Volts DC, measure voltage on signal wire at TPS plug by gently front probing signal terminal with one probe, and the other probe on battery ground. Voltage should be close to zero.

-If you're still showing 5 volts, you're shorted to voltage. (My guess is this is not your problem, but possible.)

-If you're showing 0 volts, turn key off. Ohm out signal wire from TPS Connector to C2 (Still unplugged) if resistance shows OL (open) repair broken wire.

-If resistance is below 5 ohms, check to be damn sure you don't have any corrosion on the terminals and that the terminals aren't spread. If everything looks good, get back up with me and we'll go from there.

Ok. You were getting some funky readings and I think I figured out why. I was in a hurry and used the wire diagram someone posted above. I pulled the 97 2.5 print, and looks like you're wiring is different than 98 and up. Who would've figured?

Do the exact same tests I said above, but C1 is the connector you want to attack. Not C2 (according to the print.) I got this straight out of the 97 FSM.

I re-wrote the procedure with a few more details and with the correct connector at the PCM. Let me know what you get.


-With Key Off, Disconnect C1 at PCM

-Turn Key On/Engine Off: Disconnect TPS Connector.

-With a multimeter set to Volts DC, measure voltage on signal wire at TPS plug by gently front probing signal terminal with one probe, and the other probe on battery ground. Voltage should be close to zero.

-If you're still showing 5 volts at the TPS connector with C1 disconnected, you're shorted to voltage. (My guess is this is not your problem, but possible.)

-If you're showing 0 volts, turn key off. Ohm out signal wire from TPS Connector to C1 (Still unplugged) if resistance shows OL (open) repair broken wire.

-If resistance is below 5 ohms, check to be damn sure you don't have any corrosion on the terminals and that the terminals aren't spread. If everything looks good, get back up with me and we'll go from there.

For god sakes. I see two ohm checks.

One on 5v which makes no sense because you said you had 5 volts at the tps connector with the key on.
One on the ground, which no sense if you followed my instructions on how to test the ground with a test light.
And zero continuity results on the signal wire which is what I specifically asked for.

I'm trying to help you. But you don't seem to want it.

Go for it dude. Replace the ground wire.