After doing the light test and the resistance test on my
TPS, I've determined that it is bad. No readings from either test,
so I unplugged it and the cars runs allot better without it
being connected. My car died quit often and was sluggish
at acceleration. Now it doesn't die and has Satifactory
acceleration, but I do getting small popping backfires when
deaccelerating.

My question is; What's inside a TPS? I plan on cutting
it open this week and finding out. Has anyone ever disassembled a TPS, and can they be repaired?

Also Auto zone has one for 299.00 for an 89 RX7, but
the Dealer says that there was 4 different ones for the
89. How does Auto Zone just have one model?

Brad89RX7

 

It's basically a voltage divider. 5V goes in one wire and is divided between the other two wires based on the sliding arm's position along a resistor. Part of the 5V goes to the ECU, the rest goes to ground.

If you look at the ECU wiring diagram there's a little representation of the TPS's internals to show the relationship between the wires. It'll make it a bit clearer to understand.

TPS problems are usually caused by broken or dirty contacts that cause an interuption of current flow.

 

Check with Ray Crowe at Malloy Mazda in Woodbridge, VA for TPS. This guy is great to work with and they discount all Mazda parts 40% for club members. The phone is 888-533-3400, ask for Ray. I bought TPS from him for $ 272.00 and they ship everything free. I have an 89 RX GTU. I have ordered several other parts from Ray and it's the only place I'll order from if I need Mazda parts.

 

$272.00! omfg!

I have NEVER paid more than $20 for a used TPS...

 

fack, i paid $30 for a brand new one from a forum member that found out he didnt need it after going haltech.

 

yes but how many have you had?

mike

 

how do i unplug my TPS, because my idle is choppy at best and by car bogs down a little on take off even with fairly new plugs(less than 5k on them) if someone could let me know i would be much appreciative

 

he is getting a new one not used


but mazdatrix sells them for a s4 at 179.14 plus shipping

 

where do u unplug it at?? please tell me i need to test this out

 

It'sunder the intercooler

 

BEFORE YOU DECIDE TO UNPLUG IT WHY DON'T YOU TEST IT FOR RESISTANCE. YOU CAN GET INFO FROM OTHER TREADS
ON HOW TO TEST A TPS. WHAT YEARS IS YOUR FC & IS
IT TURBO & IS IT THREE OR SIX PRONG LEADS ON YOUR TPS?


Brad89RX7

 

i have an 88 Turbo II, im not sure how many leads it has seeing as i dont know where to look....and i heard you have to have 2 DMM to test it and i only have access to one. can it be checked with only 1 MultiMeter?

 

is it possible to disassemble a TPS, clean it, and put it back together in working order?

 

I've never tried, but looking at it I think you'd probably end up wrecking it to get it apart.

 

I have an 89 GTU that has a 6 prong plug. The TPS is located on the Throttle Body.
Mine has two plungers 1) low throttle & 1) wide open throttle.
If you have ever manually accelerated your engine under
the hood, that's where your TPS is. It either has 1 or two plunger
sensors that rride on the Throttle.


Brad89RX7

 

Also you say you have turbo, so your TPS will be under
the Inter Cooler

 

you only need one for checking a TPS its almost better to have an analog tester though

this is because its easier to see if the voltage spikes or not with an analog tester