cpizzle42

Anybody on here know the ignition and ecu wiring on the 3.4L inside and out and how to diagnose problems with it?

I am working on a short course race truck, and just about to give up on it after working on it every night this week after work.

No spark....

'02 4runner ECU. 3.4L S/C with URD 7th inj kit.

dntsdad

I dont know it inside and out but no spark would be caused by the White/blue wire not getting power, or the body of the ignitor not being bolted down to a surface that is providing ground. The ignitor gets its ground through the mounting bolt and not a wire.

paynemw

you're in luck... I just had a wire harness issue. I didn't do the work but I will try to relay as much info as possible to you. The EFI fuse covers two circuits, (don't recall the names of them) but one circuit covers all 8 or so sensors related to fuel injection (crank position sensor, cam position sensor, throttle _____ sensor, etc) the other runs to a connection at the ECM. I'm sure you've already checked your coil packs with an ohm meter.