I have been working with Infiniti / DynoJet for about 3 days trying to find a stable RPM connection for a Wideband Commander. Here are the places we tried to get a stable reading without success.

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ECU –
Output to ignition 1-6
many more to many to list

Motor -
Ground side of coil
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The last place we tried was the negative side of the # 1 Fuel Injector. It is visible below the front left side of the plenum labeled with a large (1) on the wire shroud.


This works like a champ however it’s a hard/small place to work in but does not require any disassembly of motor components. I have attached a diagram of the fuel rail and injectors for your reference. Simply tap the RED/BLACK wire and connect to your RPM device for a solid signal. I am sure others will have opinions and as everyone says “I am sure you are correct and I am wrong” this process simply worked for me after hours and hours of testing.

 

that's pretty trick... you could also grab ECU pin 21, which is where the other side of that red/black wire terminates. this way you wouldn't have to run a wire to the engine bay.

does your wideband commander need a 12v signal? that would be why the ignition output from the ECU would not work.. since it is somewhere around 5v.

good work.

m

 

Yea - we tried and were not successful at the ECU. It sure is nice being able to press a button and begin data logging at will along with programmable trigger wires for other cool stuff, spray etc..

Also: The red/black is a pulsing ground wire, as explained to me by Infiniti ??