CLT, IAT, and TPS have all quit suddenly - why?

For discussing how to choose sensors and create a wiring harness for all Bowling and Grippo versions of the MegaSquirt® EFI controller.
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Gazoo
MegaSquirt Newbie
Posts: 2
Joined: Sat Jun 27, 2009 6:08 pm

CLT, IAT, and TPS have all quit suddenly - why?

Post by Gazoo »

Since the last time I was working with with the MSII, I have lost signal for the coolant temp, air temp, and TPS (Well, the TPS gives a signal, but only from 0 to 11 which only registers a wiggle on the gauge.) All of these were working fine last time I was trying to tune. No changes have been made to the wiring, which is fully secure and sound. I don't get it. Any ideas, anybody??

Thanks
Gazoo
DonTZ125
Experienced Squirter
Posts: 337
Joined: Sat May 16, 2009 1:49 pm
Location: Scarborough, ON
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Re: CLT, IAT, and TPS have all quit suddenly - why?

Post by DonTZ125 »

All three are driven from the 5vref pin. Measure the voltage there - anything? Any burned / broken pins, leads, wires?
Gazoo
MegaSquirt Newbie
Posts: 2
Joined: Sat Jun 27, 2009 6:08 pm

Re: CLT, IAT, and TPS have all quit suddenly - why?

Post by Gazoo »

Well, good news - before taking things apart, I reflashed the code and it started working normally again. Not sure why I decided to do that, but it was a good hunch. Thanks for the tip on the 5V though.
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