Just finishing up the DIYPNP assembly and about to start on installation, but have a few specific questions that some of you have probably already been through before that I wanted to check on before finalizing. NOTE: I like to avoid adding or subtracting from factory wiring as much as possible, so most of these have to do with keeping to that goal!
1.) O2 sensor +12V. I plan on putting in the wideband using the stock wiring down to the O2 sensor connector. I see the motronic uses pin 23 to provide power to the heater relay, so I'm planning to jumper from one of the edge 12V slots (which are powered by the main relay) to pin 23 so that the factory heater relay can then be used to power the wideband. Should work just fine, right? For some reason pin 23 isn't covered in the diyautotune setup instructions.
2.) Wasted spark coil outputs via cylinder ID sensor wires. Since the CID never did much to begin with and certainly won't do anything helpful for Megasquirt, any reason NOT to use those two wires (pins 8 and 31) for spark outputs B and C? Would love to not need to pull anything extra through the firewall, but not sure if those wires are up the task of handling the current needed for direct coil control. Spark output A I would just leave at pin 1 and use the wire from the factory coil. Anyone done this or something similarly clever to avoid messing with the DB15 connector and extra wires through the firewall?
TPS found everything I need already and should have that one taken care of ;)
Thanks!
For reference, DIYPNP assembly instructions:
Motronic 1.3 pinout:
1.) O2 sensor +12V. I plan on putting in the wideband using the stock wiring down to the O2 sensor connector. I see the motronic uses pin 23 to provide power to the heater relay, so I'm planning to jumper from one of the edge 12V slots (which are powered by the main relay) to pin 23 so that the factory heater relay can then be used to power the wideband. Should work just fine, right? For some reason pin 23 isn't covered in the diyautotune setup instructions.
2.) Wasted spark coil outputs via cylinder ID sensor wires. Since the CID never did much to begin with and certainly won't do anything helpful for Megasquirt, any reason NOT to use those two wires (pins 8 and 31) for spark outputs B and C? Would love to not need to pull anything extra through the firewall, but not sure if those wires are up the task of handling the current needed for direct coil control. Spark output A I would just leave at pin 1 and use the wire from the factory coil. Anyone done this or something similarly clever to avoid messing with the DB15 connector and extra wires through the firewall?
TPS found everything I need already and should have that one taken care of ;)
Thanks!
For reference, DIYPNP assembly instructions:
Motronic 1.3 pinout:
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