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I have a P06 that I sent out to a reputable dealer to be chipped and converted to VTEC. I got it back and put it in my car. I had a dead miss on cylinder 4. Double checked all of my wiring and followed all of the proper diagnostic stuff. I didnt have injector pulse on 4. Decided to switch my ECU out to a spare P75 I had in my junk Integra and the miss went away. All-in-all, the dealer is going to redo another P06 for me free of charge so no issues there. But being an engineer by trade I like to mess with things so I opened the ECU and started poking around.

I'm 99% sure its the injector transistor. I traced pin A2 to QM2, which I guess is responsible for inj 3 and inj 4. Nothing looks burnt up on the transistor or anywhere else on the board for that matter. I have continuity between two pins on the transistor. Idk if this is good or bad. I checked QM1 and I don't have continuity between any of the pins.

How do I go about checking these to see if they're good or bad? I just picked up another P06 to ship out, and I'm showing continuity between two of the pins on QM2 on the new one too, but nothing on QM1. I could just throw a new transistor in the old one, but I also want to make sure this new one is good before I ship it out.

I found some stuff online about testing 3 leg transistors but nothing for a 10 leg.

Thanks.

What your P06 QM1 & QM2 component remark? if STA460C then refer the datasheet.
http://www.sanken-ele.co.jp/en/prod/sem ... a460ce.pdf

Checking theory same with 3 pin transistor.

Thanks for the help. The number on my transistors is STA413A. I did find a datasheet for it. I'll see what I can figure out. I'm not the best with circuits.

Put Multimeter to buzzer or continuity or resistance range 100, tap positive probe to any pin 3,5,7,9 (Collector), tap black probe to 1 or 10(Emitter). If transistor ok, nothing will buzz or display any resistant value on multimeter. If there buzzer beeping or resistance value that mean the transistor point is short/close circuit.

Thank alot. That's exactly what I needed. I appreciate the help. I'm going to go back through both of my P06s tonight and try this out.

Sorry to bump and steal the thread op, does anyone know where to buy these transistors?

http://www.digikey.com/product-detail/en/STA413A/STA413A-ND/4289350

or for example :

http://www.ebay.com/itm/STA413A-SANKEN-INTEGRATED-CIRCUIT-/200909354043?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item2ec721743b