Alright so both codes came up this week but at different times. When code 22 came up, code 33 came up simultaneously. Would this be a good indication that I have a bad TPS? I have checked all connections and even applied dialectric grease to them and these codes keep coming up. I am temtped to just buy a new TPS but don't want to spend 50 bucks and then find out it didn't solve anything. Any help would be much appreciated. Thanks.

 

Test your TPS resistance and linearity through the entire range of operation. If there are dead spots or the resistance isn't correct, replace it.

 

I have tested it through the range and the voltage gradually increases and decreases as i move it. What exactly to you mean by resistance and how can i test it?

 

Never mind. You tested the output voltage from the TPS with power on. You could have also tested the circuit resistance with the power off. The information from either test method would answer the same questions.

A '22' and '33' in a MAF system will commonly occur simultaneously. The reason for the '33' is frequently the low TPS signal.

Since the sensor itself is evidently at least working correctly, what is the TPS voltage with the engine at idle?

 

I will have to get back to you on that one. I don't have access to a DVM for a couple days.

 

OK so i checked the voltage while the car was running. My constant voltage varied between 5.18-5.31. and my variable voltage at idle varied from 0.69-0.81. When the engine is not running but ignition is on. The constant reads 5.07 and the variable reads 0.53. When adjusting the TPS should it be done while the car is running? Why am i throwing these codes?

 

OK so i checked the voltage while the car was running. My constant voltage varied between 5.18-5.31. and my variable voltage at idle varied from 0.69-0.81. When the engine is not running but ignition is on. The constant reads 5.07 and the variable reads 0.53. When adjusting the TPS should it be done while the car is running? Why am i throwing these codes?
Does it sound like a bad TPS?

 

The reference voltage should not vary. The TPS signal voltage should not vary when the engine is running. The ECM contains a 5VDC regulator that should be providing 5.00 VDC to all the low voltage sensors. They are fairly stable and reliable. If the TPS is reading 0.53V with the engine off (ideal setting - don't adjust it) but is climbing to 0.69-0.81V with the engine running, either the TPS or throttle shaft is moving, or the ECM reference voltage is not stable.

Verify that there is no excessive play in the throttle shaft and TPS mounting. If that's alright, you need to inspect the grounds for ECM, chassis, and wire harness. Make sure you are using the ECM signal ground for your reference point instead of a body or engine ground when testing the TPS output voltage. Theoretically, they should be the same, and usually are the same if all the grounds are properly connected. A difference between the ECM signal ground and engine/chassis ground readings could indicate a poor ground connection.

Another remote possibility is that the alternator has a failing diode in the rectifier bridge, and some AC voltage is being imparted on the system. That can cause problems such as you are experiencing.

 

Before when i tested and i got like .69-.81 it's because i was running my ground jumper off the alternator so i grounded it off the TPS ground it it read between .53-.55 varying a little. The trottle shaft and Tps were not loose or moving. I then checked the ground on the chassis and the voltage read 0.51-0.54. Is that an idication of a bad ground and is ok for them to be off just a little. What else could cause this problem?

 

Your TPS voltages seem normal. The difference between the engine ground (alternator case) and ECM ground may be a problem. Start checking ground wires and straps. If you can read a voltage between the ECM ground and chassis/engine ground that is more than a few millivolts, there is a problem.

 

Where are these straps and grounds located and exactly how do i test them?