Toymods Car Club Inc: Tech & Conversions => megasquirt wiring question

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thechuckster
Forums Junkie

Location:
Brisbane
Registered:
February 2003

Re: megasquirt wiring question	Sun, 04 September 2005 11:21

i was trying to get you to disconnect your TPS at the relay board, then run a short jumper wire from connection marked TPS to any of the earths. That should force it to think that the throttle is shut. To test the resistance of the TPS to identify the three pins, you have to disconnect it from the relay board - you can't do it live or connected to the ECU... then follow the instructions: (Note: set the multimeter to a low resistance range (e.g. 0 to 2K ohms) Mount the TPS on the throttle Disconnect the wiring from the relay board set your digital multi-meter to measure resistance. start measuring resistance across pins as you move the throttle 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 (the one not being tested at the time) 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 the 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. The remaining wire is the TPS sense wire you identified earlier. cheers, Charles. [Report message to a moderator]

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