P0335 and P0340 after submerged in water

[GLP]

Got the 4Runner stuck in water for an hour before getting pulled out and about a week later started getting a knocking noise when I would turn ignition. Thought it was a dead battery at first but turn the key a few more times and the engine would start up and run fine. It's not a solenoid type of click, it's a knock coming from the engine when you turn the ignition and nothing else happens. This went on for a few days and then started getting codes P0335 and P0340 which is camshaft and crankshaft position sensor circuit's. It seems like some electronics got wet but it's kind of strange that the problem didn't show up until a week after. This is an intermittent problem and it runs fine even if the check engine light is on. You just have to hit the key three or four times to get it to turn over. By the way checked other fluids and no water in the engine or diffs. There were virtually no problems after I got pulled out of the water.

Anyone have this problem before after being in water? Just wondering where to start looking for water as it's been almost two weeks now so I thought everything would have been dry after a few days .

 

[AuSeeker]

Don't know what advice to give you, except have you checked all fuses, I would think if something shorted out from the water it may have blown a fuse or two.

 

[lightfreak]

It's possible those sensor connectors have started to corrode from the water

Download this wiring diagram
http://www.ezdries.net/Vidpics/4Runner Wiring diagram/2003 4Runner Wiring Diagram.zip
Look under section Electrical Wiring Routing, and open parts.pdf file.

Since you have a V8 you want to check the diagram for the 2UZ-FE, it lists the V6 1Gr-FE as well.

Locate those 2 sensor connectors, dry them out and clean with electrical contact cleaner, apply some dieletric grease and re-connect.
While you're at it you might want to inspect the wiring going to those connectors.

Clear your codes , go for a drive and see if those CEL codes come back.

 

[GLP]

It's possible those sensor connectors have started to corrode from the water

Download this wiring diagram
http://www.ezdries.net/Vidpics/4Runner Wiring diagram/2003 4Runner Wiring Diagram.zip
Look under section Electrical Wiring Routing, and open parts.pdf file.

Since you have a V8 you want to check the diagram for the 2UZ-FE, it lists the V6 1Gr-FE as well.

Locate those 2 sensor connectors, dry them out and clean with electrical contact cleaner, apply some dieletric grease and re-connect.
While you're at it you might want to inspect the wiring going to those connectors.

Clear your codes , go for a drive and see if those CEL codes come back.

Thanks for the wiring diagrams. I unplugged the sensors and they looked dry and clean so I don't think that was the problem. I cleaned them anyway. Cleared the codes and it was fine for about 4 days, then they came back.

In the mean time I have been trying to diagnose an intermittent starting problem. That knock I was hearing when trying to start is a loud click coming from the starter. I have learned that the starter is located in the middle of the engine between the heads so I put my stethoscope on the starter while attempting to start it and verified the click is coming from the starter. I usually have to turn the key about 3 or 4 times to get it to start.

Under normal circumstances at this point I would be 90% sure the start problem is the starter solenoid contacts but with the sensor circuit codes going off I don't know if this is some other more complicated electrical problem causing both the starter and sensor circuit problems. If the starter wasn't so difficult to get to I would just replace the contacts and deal with the codes later but I want to be as sure as possible that it's the contacts before tackling that.

Any other ideas before I bite the bullet and do the starter solenoid rebuild? I checked the battery and it is good.

 

[desertyeti]

I cleaned the power and ground cables on the starter. After being submerged for 4 hours I had the same clicking issue which was getting worse. The cables were starting to corrode a bit but mostly covered in dusty dry mud. Seems to be starting up just fine with AC and lights on during ignition. Hopefully that did the trick.