QuestionQUESTION: Hi, I've been doing a lot of work on my 01 sonata 2.4L car,
have replaced the following relevent items to the question:
fuel filter
EGR valve
Throttle Position Sensor
Alternator
pre and post Oxygen Sensors.
The car is running like dirt, turns it over, and it tries to
die out,, and i have to give it lil gas to keep it going,
after it warms up it seems to be a little better but its
pretty hesitent when pushing on on gas, gets to about 2K
rpm, and then push any harder on gas it cuts down, then
shoots up, also bucks on highway last time i had it on the
road. Replaced what i said above that is relevent to this
item unless you ask anything that i may have replaced that I
never said and dont think is relevent, Added fuel injector
cleaner and used Throttle body cleaner aswell.
No engine light is on, I have a OBDII reader, and cleared
the o2 sensor codes, the TPS code came on, and i think for
some reason this new tps is faulty seeing the symptoms seem
to be a TPS issue. So no codes up ran er for few hours and
no codes coming up. Any Ideas or input?
ANSWER: Hi, Shawn.
Check your throttle position sensor to ensure it's installed and adjusted correctly. The pink wire (terminal #3) is for what is called an idle switch. With the throttle closed, this wire should be grounded. When the throttle is opened just a little bit, the ground should be taken away.
Also check for a broken wire near the throttle position sensor. I've seen this occur several times.
It's also possible you have a problem with your air flow sensor or a break in the hose between the sensor and the throttle body.
Can you give me the actual numerical codes for the throttle position sensor and the oxygen sensors? These codes may help me assist you in locating the problem.
---------- FOLLOW-UP ----------
QUESTION: I get 4.74 volts on the pink wire when the car is running.
how should i be installing the tps, i know when the plate
opens it moves the 2 metal pieces one way and they are spose
to move the sensors in the way that the sensor turns. but how
much should it be springed or turned?
ANSWER: Loosen the attaching screws for the TPS just enough so you can turn it. Turn it until the voltage in the pink wire goes to 0V and tighten down. Then verify the voltage in the pink wire is 0V with the throttle closed and about 5V (4.74 should be ok) if the throttle is opened just a small amount.
---------- FOLLOW-UP ----------
QUESTION: Okay measuring pin 2 and 4 the non lightblue one, so blue
and black/white. Im spose to have what voltage on WOT and
what when installed,The car is working better than it has
and the magic number of voltage is .527 V and WOT is 4.78 V
what should these numbers be, I also got P0300 and P0134
come up, but im not sure if they were in the computer before
hand, new o2 sensors were just put in her. ima get some new
sparkplugs for the random misfire and try unpluging the o2
sensors and pluging them back in, see if resets the
computers brain.
AnswerI'll go through all three of the remaining wires (after the pink one from the previous question). Throughout the descriptions, it is assumed that the ignition is on (engine need not be running).
Pin 1 -- light blue/black -- This is the 5V supply from the computer. If you probe your positive lead here while the negative probe is on the negative battery terminal, you should always receive around 5V.
Pin 2 -- blue -- This is the signal from the TPS. With your negative probe at the negative battery terminal, probing this wire should yield near .5V with the throttle closed and near 5.0V with the throttle open. The lower value isn't too critical, as the sensor is primarily adjusted off the idle switch (as mentioned previously) rather than the TPS voltage itself. The service manual lists the range of 300mV to 900mV to be normal at closed throttle. If you open the throttle slowly, the voltage should transition smoothly from one reading to the other.
Pin 4 -- black/white -- This is the computer supplied ground. Ideally, this should be exactly the same as the negative battery terminal. Placing your negative multimeter terminal here should yield nearly the same results as if it were attached to the negative battery terminal. An easy comparison is to place your positive lead on the light blue/black wire and the negative lead here and verify that it's approximately the same voltage as in the pin 1 description above.
