Defective Hondata ECU P28, TPS sensor
Allow me to share my brief saga with my defective Hondata ECU...
Cliff notes:
-I got a defective Hondata ECU
-Their tech support sucks
-I fixed the ECU without their help
-TPS isn't that important, car runs fine without it
So about 5-6 years ago I traded Dropspeed my HIDs for a Hondata s200 (thanks Tom Payn for the sponsor tune). This whole time I have had a fault code for TPS sensor. I calibrated multiple sensors and still a fault. Yesterday, I finally got fed up and decided to get to the bottom of it. (heres to procrastination:
)
After ruling out TPS sensors (have 3) & wiring harness, I came down to ECU. I posted my issue on the Hondata forums, and didn't really get anywhere with their help there. So I called their tech support and ended up talking to the same guy from the forums. Matt aka spunkster. The name fits. The guy was completely uninterested in helping me despite his consistent yet worthless replies online.
He made it overly clear that I was way out of warranty (understandable) but didn't show a lick of interest that their ECUs may have manufacturing defects.
Well the problem was that the OBDii -> OBDi adapter (red jumper PCB) they have built in their ECUs was bad/wrong/defective. My TPS signal didn't go anywhere once it entered the ECU. Long story short, I used the Helms ECU I/O pinout, followed the foil traces, and jumpered the pin to the correct location on the Honda PCB (analog/digital converter IC).
Now my TPS is working properly, and I am
The car was still fast and still made 185@wheels on Mustang w/ just bolt ons and stock cam timing. This is with the TPS signal defaulted to 26%. So basically, it doesn't do much!!
The End.
Here's some pics (also notice shitty rivet job on fet heatsink. Nice manufacturing guys!

Cliff notes:
-I got a defective Hondata ECU
-Their tech support sucks
-I fixed the ECU without their help
-TPS isn't that important, car runs fine without it
So about 5-6 years ago I traded Dropspeed my HIDs for a Hondata s200 (thanks Tom Payn for the sponsor tune). This whole time I have had a fault code for TPS sensor. I calibrated multiple sensors and still a fault. Yesterday, I finally got fed up and decided to get to the bottom of it. (heres to procrastination:
)After ruling out TPS sensors (have 3) & wiring harness, I came down to ECU. I posted my issue on the Hondata forums, and didn't really get anywhere with their help there. So I called their tech support and ended up talking to the same guy from the forums. Matt aka spunkster. The name fits. The guy was completely uninterested in helping me despite his consistent yet worthless replies online.
He made it overly clear that I was way out of warranty (understandable) but didn't show a lick of interest that their ECUs may have manufacturing defects.
Well the problem was that the OBDii -> OBDi adapter (red jumper PCB) they have built in their ECUs was bad/wrong/defective. My TPS signal didn't go anywhere once it entered the ECU. Long story short, I used the Helms ECU I/O pinout, followed the foil traces, and jumpered the pin to the correct location on the Honda PCB (analog/digital converter IC).
Now my TPS is working properly, and I am
The car was still fast and still made 185@wheels on Mustang w/ just bolt ons and stock cam timing. This is with the TPS signal defaulted to 26%. So basically, it doesn't do much!!The End.
Here's some pics (also notice shitty rivet job on fet heatsink. Nice manufacturing guys!

Lol, That seems to be the general statement about him.
I have talked to henry, he is very helpful. Matt is just a uuummm, bad with dealing with people.
His car didn't have a motor in it for over 1/2 that time.....

Ed....FYI Tom Payn was converting some of his own ECUs instead of buying them from Hondata so that may have been the issue?
If it was "splatter" painted with a HONDATA sticker it was legit.
If it was standard looking ECU......Payn Tech had it convereted.
-Matt
Thread
Thread Starter
Forum
Replies
Last Post
turbodcxbro
Engine Management and Tuning
1
Jan 9, 2010 11:31 AM
snowseeker
Tech / Misc
5
Aug 29, 2008 07:49 AM




