Does Semi-Sequential Injection really work on JZX90?

[ICHIRO]

I'm Japanese. So my english is very poor sorry!

My JZX90 (1JZ-non vvt) have 3 group Injectors. The combination is below.

1st: 1-4, 2nd: 3-5, 3rd: 2-6

firing order 1 5 3 6 2 4.

Default Injection Mode is Semi-Sequential Injection on my JZX90 plug and play ecu. But the help text says...

·6 Cylinder, firing order 1 5 3 6 2 4. Works nicely as per rule. Fuel sits in port for 120 degrees longer on the higher numbered cylinder in the pair than the other.

·Injector drive 1 is wired to injectors for cylinders 1 and 5.

·Injector drive 2 is wired to injectors for cylinders 2 and 4.

·Injector drive 3 is wired to injectors for cylinders 3 and 6.

Does Semi-Sequential Injection really work on JZX90? Unfortunately, My JZX90 have rough idle...

[Adamw]

Yes this will still work correctly for semi-sequential.  The only difference between your wiring and the example in the help file is the firing order is just shifted 120deg earlier - so effectively they start counting from cyl 4 instead of cyl 1.    

Something like this:

I would expect end of injection timing around 420BTDC would probably work for this wiring.  Your rough idle may not be fuel related, injector timing often doesnt make much difference to the way it runs for most engines.  Possibly idle ignition control or some other factor?

[ICHIRO]

Thank you for your advice! I tried it and my rough idle was little fixed. (Misfire was completely fixed!)

Unfortunately, I found that JZX90 plug in ECU have another hardware issue...

JZX90 plug in ECUs ISC Stepper port AUX6 and AUX7 are reversed. Therefore, ISC does not work at all in its original wiring.

When I tried swapping the AUX6 and AUX7 connector pins, ISC worked properly and rough idle was almost fixed.

...What does "Plug in" means?