Engine/Electrical Issues after water crossing

[notfromtheuk]

I did a couple water crossings well off roading the other day, and may have bit off more than I can chew on one of them. I kept a consistent speed, and had a good bow wave in front of me, but there were moments where the water was up to the headlights.

On the trail after one of the longer water crossings, I noticed the speedo was acting quite sporadically for a few moments, but then continued to work.

Anyways, I was able to finish the trail, and start heading home when I began to notice performance issues. Thats when I got the check engine light, and the traction control lights. If I stopped, the truck would stall. I could start it, but it was in some kind of limp mode. Sometimes it would reset and drive normal for a while. I got it to make it about 40km (with a couple restarts) and I had a mechanic get it towed back to where I live.

Here are the codes I got:

P0606: ECM/PCM PROCESSOR FAULT
P2103: THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT HIGH

I haven't found a lot of information, sounds like I may need to replace my ECM. It's at the mechanics and they're going to take a peak on Monday. I'm hoping its nothing too serious, and that I can get it repaired. Again, it wasn't an overly deep water crossing (it had its moments), and I figured I'd run into other issues before running into electrical issues.

 

[gm350reratliff]

You will need to start by taking every electrical connection apart and blow out any water that is in there. I would also recommend putting some electrical grease in the connections before plugging them back together. Did you get water inside the vehicle?

Water crossings definitely seem to be the kryptonite to these 4th gens which are otherwise pretty bulletproof. Myself, I have had bad luck with water getting into the wheel bearings during deep water excursions. I now try to stay away from deep water in my 4th gen.

 

[Ralph Blake]

You sure don't have to tell me about getting into water,after getting hit by an over flowing flood drain in a hard rain.

$1,500 dollars later my 98 Nissan Maxima was running again.
That told me keep my 4Runner as dry as possible.

 

[notfromtheuk]

You will need to start by taking every electrical connection apart and blow out any water that is in there. I would also recommend putting some electrical grease in the connections before plugging them back together. Did you get water inside the vehicle?

No water inside the vehicle. We had a consistent pace all the way through the water.

 

[DanielMaat89]

I found this by doing a little bit of searching. It may just be the throttle actuator or the connections going to it. If the actuator is sending incorrect signals back to the PCM, or there is a short somewhere, it'll through this code as well.

P0606 Toyota ECM Processor Error OBDII Engine Light Trouble Code | Engine-Codes.com

 

[notfromtheuk]

Well good news from my mechanic. He let the vehicle sit and dry for a couple days and its running fine again. He looked into it as much as he could and he thinks it might have to do with the rear oxygen sensors either getting wet or because of a sudden temperature dip because of water getting into the exhaust.

He suggested the best way to look into this would be to put a data logger device on the vehicle when I have time, and try a similar water crossing and try to get more information about it. There's a risk that I might not be able to drive for a couple days (same situation), but thats ok as I live in a city and commute via bike.

 

[blind squirrel]

I don't know... you usually only get lucky once... why try it again to find out what caused the issue. I would just stay out of deep water and count your blessings. On the other hand machines usually don't just fix themselves, hope yours did though. :fro: