I've removed my tst box for service and now I've got a cel and a code for low map sensor voltage. Will it just go out when I put the tst back in? I'm guessing unplugging the tst harness will resolve the cel?

I know someone is going to ask- I had the tst mounted out of sight and the fueling light was coming on the remote so I thought it was functional despite no reading on my butt dyno. I remounted the box and lone behold, no green light at all I checked the voltage on the harness and got the proper reading so I'm sending it in for service.

 

cant you use the smarty to clear it?

i got all kinds of codes myself right now...but no CEL

i had one for mao sensor voltage, and then one for throttle position sensor too low or something. i hope the apps isnt going bad

 

My TST just did the same thing, I just sent it back also, when I tested pins #5 and #9 for power to the pump tap thru the harness I think that is what activated the light, somethin about disconnecting the harness while the key is in the on position, I just re connected my map and after a few cycles the light went off.

 

Roger that

Ya know, I just had a thought,....
Maybe I should get them to extend the rpms a bit while they have it
The comp upgrade is pretty much fuel harder, fuel sooner, and fuel longer- but I think fueling longer into the rpms is the only one I'd really want

 

I cleared it and it came back. I checked the #5 and #9 pins like 1qck so I'll just wait and see.

 

If I understand your problem right...this might help!
TST advises to unhook the harness at the map sensor anytime your removing the box! Not sure why cause I'm electrically challenged.

RJ

 

The MAP is sending a signal to the TST and it's altering it and sending it back to the computer. Guess what happens when the computer no longer gets the MAP signal.