Increasing Idle issue on Tercel

[Jo_Tercel99]

Hi everybody,

here the link to explain my project.

http://www.msruns.com/viewtopic.php?f=104&t=22749

I have a problem with my megasquirt. I now sharing sensor with the stock ECU. The megasquirt doesn't contrôle the engine yet. When I plug the Megasquirt my idle increase from 750 RPM to 1250 RPM. I first tougth that it was my 12V source that was the problem. It was plug on the ECU 12V source and I tought that it was because it was seeing the electrical load increased so it increased the idle. But, I plugged my 12V source directly from the batterie, control by a relay and it didn't change anything.

Could it be because I'am shearing sensor ?????

Thank you

[Matt Cramer]

Which sensors are you sharing?

[Jo_Tercel99]

I'am sharing the

CLT,
IAT,
TPS,
NE (+ Trigger signal from VR sensor),
NE- (- Trigger signal from VR sensor).

They all seems to work fine.

If you need more informations feel free to ask

[Matt Cramer]

Have you removed R4 and R7?

[Jo_Tercel99]

No, I don't, should I ? Do this resistances will affect the signal to the stock ECU. If I remove it, should I have to found the right resistance for my system or I just need to jumper them or let them empty ??

Thank you

[Matt Cramer]

To share temperature sensors, you must remove R4 and R7 or you'll confuse the stock ECU. Then you need to recalibrate the MS for your sensors and the stock ECU's bias resistors. Please see this link:

http://www.megamanual.com/v22manual/sharesen.htm

[Jo_Tercel99]

Problem solved. Thank you Matt