Skip the auto shop - Our mechanics make house calls

Q: TPS connector voltage

asked by on

I've come a LONG ways with this car. Hopefully this will be my question. On my TPS connector I'm suppose to be getting 5 volts on my voltage signal wire, .9 to 1 volt on my signal wire and .30 ohms on my ground wire. My voltage wire is getting the proper 5 volts. My ground wire is getting the .30 ohms. But my signal wire that's suppose to put out .9 to 1 volt. But it is putting out 4.56 volts. That's about the same as my voltage wire. What would the problem be and what's causing this. HOPEFULLY it's not my computer on the car. Is this something that I need to trace the wire from the connector to the computer, or what. What would be all the steps I need to do to eliminate every possible problem. Thank u

A: Hi there. Assuming, you are testing the TPS...

Hi there. Assuming, you are testing the TPS (throttle position sensor) connector while disconnected, the described parameters could be considered normal. Some ECM (engine control module) signal voltages default to near 5vts, sensor open. If you are back-probing the connector while connected to the TPS, this would indicate an open TPS unless the throttle plate is wide open or the signal wire is shorted to the reference wire. Closed throttle, the signal wire voltage is typically between .5-1vt. Measuring the resistance value (ohms) of the TPS itself (disconnected) should be a fixed value between reference and ground, varying resistance between reference and signal, or signal and ground with throttle plate movement. Not knowing year, make, and model makes it difficult to be more specific. I recommend having your vehicle’s check engine light be diagnosed and repaired by a certified technician, such as one from YourMechanic.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...