2001 3.5L Pathfinder CEL code P0505..ISCV/TPS/PCM/ECM?

[nissan2986]

I recently had an independent mechanic clean the battery terminals after fixing a P1320 code. He said take it to a Nissan dealer to fix the P0505 code. The Nissan dealer charged me $120 to "diagnose" my car, but they didn't look into the P0505 code like I had asked. They just said I need fluid changes, a ball joint and cv boot, repack bearings, brake fluid change, pads, and this will cost $2000. They said for P0505 diagnostic I will have to leave the car 4 hours. They said it is possible the previous mechanic did not disconnect the batter in the right sequence which shorted the computer. Is that even possible? I did not have the P0505 before taking it to the first mechanic. Just the P1320 and an O2 sensor code. The next day I get a call asking me if I want to trade in my car for a new one... crooks.

It is possible the previous mechanic did not disconnect the battery cables in the right sequence and fried the PCM/ECM/ECU?? Since the dealer was no help, I bought a chilton manual. I checked the resistance on all terminals for the ISCV and I had ~24-~25ohms. The connector going to the ISCV had power so that seems ok.

Next I checked the connectors going to the TPS. The orange one was ~5v (fine according to the chilton manual), but the second gray connector didn't show any voltage reading. Where does the power for this gray connector come from? If I don't have power going to the gray connector on the TPS, will that trigger a P0505? Can I open the ECU up and re-solder the TPS circuit myself? Is there a reputable pathfinder ECU rebuilder? Some guy on ebay is charging $200 to take my ECU, rebuild it and mail it back. Is there a guy with a reputation out there if indeed this is my problem?

Thanks

[Towncivilian]

What is your Pathfinder's manufacturing date? You can find this on the driver door jamb sticker.

See page EC-421 of the factory service manual for a diagnostic procedure; try to follow it as best you can.

The factory service manual is a much better resource than the crappy Chilton book, but there is a 2001.0 and 2001.5 model year Pathfinder so I need your manufacturing date to link you to the proper FSM.

[nissan2986]

The car was built 02/2000 but the registration says 2001.

Those instructions look like I need a special computer to re-learn idle.

Won't this work?
http://www.justanswer.com/uploads/FixUr ... onsult.jpg

[Towncivilian]

OK, you have a 2001.0 Pathfinder.

Page EC-59 has instructions for use without CONSULT-II.

Download the entire copy of the factory service manual. To save a copy of the FSM, right click -> Save As on every PDF, save them into a single folder, then use fwd.pdf to navigate.

[nissan2986]

I tried to relearn the idle w/o the computer using those steps and I still have a high idle. The computer was cleared so I don't think it's ready. Will that have any effect on the idle relearn procedure?

Once again I have 5 Volts coming from brown wire to TPS, and 0 Volts on the gray one.

[Towncivilian]

The gray one comes from the ECM and is supposed to have a voltage between 0.1 and 14 volts when the engine is running.

Open the hood and turn the ignition switch to "ON", then "OFF". Do you hear a series of clicking noises?

[zach7685]

what would a lack of clicking mean

[Towncivilian]

I believe the clicking noise is the IACV stepper motor moving. If it isn't audible, I would perform the diagnosis procedure in the FSM regarding the power circuit.