TPS wont caliberate?

breeza18 · Post by **breeza18** » Mon Jan 26, 2009 4:26 pm

hi all in the final stages of setting up my megjolt but i cant get the tps to caliberate, iv'e tried all different combinations of wiring but keeo getting an erroe code of '246 value must be a greater value than 246'??????? im well confused somebody help!!

Post by **brentp** » Tue Jan 27, 2009 7:39 am

Hello,

Where are you seeing this error message? Are you getting this when you're running through the TPS calibration process, or are you seeing it elsewhere in the software?

breeza18 · Post by **breeza18** » Tue Jan 27, 2009 9:20 am

hi brent, i get this when running thro the ts setup, throttle fully closed......enter. throttle fully open......enter. then i get the error message?

Post by **brentp** » Tue Jan 27, 2009 7:33 pm

Hello,

The error message is a bit obtuse, but it's telling you it cannot detect a change in voltage on the TPS input when you move the throttle.

Double check your TPS connections and refer to the following diagram:
http://www.autosportlabs.net/MJLJ_V4_ve ... _operation

Start with the TPS disconnected from the MJLJ. The resistance between the purple and grey wire in the diagram should *decrease* as you depress the throttle; conversely, the resistance between the green and purple wire should increase as you depress the throttle.

After you identified the correct pins on the TPS, re-connect it to the MJLJ. Using a volt meter, the purple wire should increase in voltage as you depress the throttle.

Let us know what you find out!

breeza18 · Post by **breeza18** » Tue Jan 27, 2009 9:35 pm

thanks brent i understand what you are saying but ive tried all possible combinations of the wirs available and still no joy?? i'l play with it some more tomorrow and let you no how i get on, thanks.
Ash

Dean924s · Post by **Dean924s** » Tue Jan 27, 2009 11:29 pm

Have you tried putting a meter on the tps to see that it is working?

breeza18 · Post by **breeza18** » Wed Jan 28, 2009 5:23 pm

ok, had the tps off and using a multimeter i get variation in resistance as i move it round and vice versa if i reverse the wires. plugged it all back in and.......stil wont caliberate. might sound a silly question but the engine doesnt have to be running while i try and do this does it? ignition is on and theres power to the mj, i can load maps to and from it easy enough. its just the tps thats left to do now, really bugging me!! thanks for the help so far.

MartinM · Post by **MartinM** » Wed Jan 28, 2009 6:03 pm

Power to the MJLJ is all you need to calibrate the TPS.

More importantly, do you get a varying voltage on the TPS input pin to the MJLJ when you move the TPS (with it powered up. of course)?

breeza18 · Post by **breeza18** » Wed Jan 28, 2009 6:19 pm

ive not testet it at the mj end yet as it got too dark, but all the cables look in good order. no reason why i shouldnt be getting the variation? i'l check tomorrow abd report back? just dont understand what could be wrong?

Dean924s · Post by **Dean924s** » Wed Jan 28, 2009 11:57 pm

breeza18 wrote:ive not testet it at the mj end yet as .. .. .. , but all the cables look in good order.?

He he he ... . . Been there done that. Don't assume that it is good. Judging wiring by its looks has got me in some really bad places over the years. LOL

breeza18 · Post by **breeza18** » Wed Feb 04, 2009 1:49 pm

ok so the car is now running but i still cant caliberate the tps. ive checked the wiring and i get the 5v from mj, ive tested the tps and the resistance changes as i open close the throttle, so why the feck wont it caliberate!! pulling my hair out!

Dean924s · Post by **Dean924s** » Wed Feb 04, 2009 2:09 pm

breeza18 wrote:ok so the car is now running but i still cant calibrate the tps. ive checked the wiring and i get the 5v from mj, Ive tested the tps and the resistance changes as i open close the throttle, so why the heck wont it calibrate!! pulling my hair out!

Wait resistance or voltage? Most TPS varry the voltage, Have you looked at the V out while it is in the car and it is running?

breeza18 · Post by **breeza18** » Wed Feb 04, 2009 2:19 pm

sorry i meant that with the tps dissconected from the car if i do a resistance test on the tps it changes as i turn it which would indicate it works, i also have 5v coming from the mj to the tps but when i conect it up..........no comprend! suppose i could try test the voltage going back from the tps to the mj

breeza18 · Post by **breeza18** » Wed Feb 04, 2009 3:09 pm

ok every thing seems to be as should be so there must be a problem with the mj unit, il report back what i find

Dean924s · Post by **Dean924s** » Thu Feb 05, 2009 2:41 am

breeza18 wrote:ok every thing seems to be as should be so there must be a problem with the mj unit, il report back what i find

Sounds like you and Brent need to huddle. That si an odd one.