se7ensport
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| posted on 21/7/06 at 08:57 AM |
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ZZR1200 TPS wiring
I'm swapping twin 45s with TPS for the above, little unsure on the wiring thought.
The wire colours on the new TPS are black, blue and yellow, any ideas which are which? I'm guessing black negative, yellow positive and blue
output to ECU, does this sound right?
Thanks
Alex
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piddy
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| posted on 21/7/06 at 10:09 AM |
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Hi.
I had the same colours on My GSXR TPS
Black-Neg
Yellow-Signal
Blue-live
[Edited on 21/7/06 by piddy]
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piddy
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| posted on 21/7/06 at 10:12 AM |
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And here is the way to test it.
MegaSquirt uses the throttle position sensor (TPS) to determine when the engine is at or near full throttle (to shut off feedback from the O2 sensor),
when the engine throttle is opening or closing rapidly (and needing an accel/decel enrichment), and when the engine is flooded and needs to be
cleared. Some people have managed to make their engines function reasonably well without a TPS. This is not recommended with the standard code,
however.
You will need a TPS that is really a potentiometer and not a switch. Many older cars had idle or WOT position switches instead of a real TPS. A real
TPS gives a continuously varying signal with changing throttle. There are two wires on the external wiring schematic that go from MegaSquirt into the
TPS sensor. These two MegaSquirt wires are +5 Vref signal and a sense line. There is a third wire going to ground. Assuming that you have a proper
potentiometer TPS, then +5 Vref goes to one side of the pot, the other side goes to ground and the sensor line is hooked to the wiper.
To hook up your throttle position sensor (TPS), disconnect the TPS, and use a digital multi-meter. Switch it to measure resistance. The resistance
between two of the connections will stay the same when the throttle is moved. Find those two - one will be the +5 Vref and the other a ground. The
third is the sense wire to MegaSquirt. To figure out which wire is the +5 Vref and which is the ground, connect your meter to one of those two
connections and the other to the TPS sense connection.
If you read a high resistance which gets lower as you open the throttle, then disconnected wire is the one which goes to ground, the other one which
had the continuous resistance goes to the +5 Vref from the MegaSquirt, and the remaining wire is the TPS sense wire
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se7ensport
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| posted on 21/7/06 at 10:19 AM |
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Thanks Piddy, looks like my initial assumption was wrong, I will also check using a voltmeter.
Alex
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