TPS readings all wrong!! Help with TPS please... Solved!

scjmc

Petty Officer 2nd Class
Joined
Apr 30, 2009
Messages
121
I was following the procedures for link and sync with my 1997 250HP 3.1L OX66. When I got to the TPS I had voltage readings of 4.8 volts. Thats right 10 times the .48 volts my manual said to look for. I know how to read a volt meter and I was reading 4.8 volts. I even grapped a second meter to check and it also read 4.8. If I adjust it all the way down it only goes to about 4.3 volts. I removed the TPS and if I move it manually I can get .48 volts, but I dont see a way to install it where it is at .48 volts with the throttle plates closed. Is the sensor going bad? Am I going crazy? At aproximately 3.2 volts it sounds like the HP pump turns on briefly. I started the link/sync process because I am having inconsistent and wierd problems, especially at idle. I also found the CPS out of adjustment (way to close to flywheel .010).
 

scjmc

Petty Officer 2nd Class
Joined
Apr 30, 2009
Messages
121
Re: TPS readings all wrong!! Help with TPS please...

Re: TPS readings all wrong!! Help with TPS please...

I remembered to include the fax cover sheet for the TPS report.
 

rodbolt

Supreme Mariner
Joined
Sep 1, 2003
Messages
20,066
Re: TPS readings all wrong!! Help with TPS please...

Re: TPS readings all wrong!! Help with TPS please...

on the TPS, your simply on the wrong wires. try pink to red. the TPS test harness changes the wire colors your reading. on the engine the orange to black is a 5V reference and the pink to black is the TPS feed back to the ecu.
on the CPS your chaseing a ghost as its simply not adjustable for air gap.
test the peak output voltage as per the manual.
 

scjmc

Petty Officer 2nd Class
Joined
Apr 30, 2009
Messages
121
Re: TPS readings all wrong!! Help with TPS please...

Re: TPS readings all wrong!! Help with TPS please...

I dont have a yamaha test harness, but I managed to make one that works. I was checking across the pink/orange. I will recheck with the red wire tonight. I will also tect the CPS for peak output voltage.
 

scjmc

Petty Officer 2nd Class
Joined
Apr 30, 2009
Messages
121
Re: TPS readings all wrong!! Help with TPS please... Solved!

Solved!! Thanks Rodbolt. I was on the wrong wires. Pink/red was what I needed to use.
 
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