Joec500

Hey guys....well it's me again, and I still can't pull the codes, I have used two ECU's and about 4 scanners, to no avail. So I think that there is something wrong with the wiring between the obd II port and the ECU, What I was thinking was cutting the OBDII port and spice it into the ECU a lot closer to the ECU bypassing all the Wiring behind the dash.

Any thoughts about this?? I looked at the OBDII port and it looks like there are only 3-4 wires to splice in.



Joe

MTL_4runner

Don't cut and splice before you check because that may not be the problem.
Just get a multimeter for like $10 and run a continuity check on the wires.
If one of the wires is "open" only then splice in another wire in its place.
Make sure to get the correct wiring diagram for your vehicle (makes a big difference!).
There should be like 6 (?) wires for the OBD connection to check.
Good luck with it.

Gadget

Is the check engine light on?

Why are you trying to pull codes?

When you plug the code reader in does it power up?

Gadget

www.GadgetOnline.com

Joec500

The engine check light has come on, I think it may be the O2 sensor. But not too sure.

When I plug in the various scanners, it says something along the lines of communication error. It just can't communicate with the ECU for some reason.


thanks for any help guys.



Joe

Gadget

It sounds like it is time to break out the factory wiring schematic book and check all the wires in the diagnostic plug.

Gadget

www.GadgetOnline.com

MTL_4runner

I agree 100% on that one.

You could replace the O2 sensor as a good guess, (as mine went out too) but that still doesn't help you fix any future problems or if the sensor doesn't fix it.

Joec500

Well guys....the culprit was a bad MAF sensor. When I unplugged the MAF, codes pulled

And it looks like Cyclinder 5 is misfiring. But I just swapped the MAF and so far no MIL.

Still rough idle at low speeds (put in drive and idling speed)

So I think the 5th cyclinder is still mis firing. Do you guys think Fuel Injector cleanining will do any good, or should I flow test the injectors?


Joe

Yoda

I know its a PITA to pull the injectors (on a 3.0 at least). If you go to the trouble of pulling them, just get them cleaned (like at Dr. Injector in the Seattle area). The guy at the Redmond Dr Injector ran a check on the one I was working on and they were ok, he just charged a min fee to check and replaced the cones and O-rings. Also exchanged one wrong injector for a correct one.