P0405 code after repairing p1447

[Dan.NY]

I have a 98 Nissan Pathfinder.  My charcoal canister let loose and I followed steps to replace canister and valve that sits on the canister. Also blew the entire system out.  Lots of charcoal.  After this I passed inspection and drove a month or more and the  1447 returned.  I couldn’t figure it out and sadly took to a shop. They said my lines were gummed with charcoal! They thought I did a poor job of cleaning and replaced  the valve in the engine compartment and vacuumed. When I picked it up it threw the 405 code.  I replaced canister and attached valve AGAIN.  I figured I bought one that was bad.   This did nothing except lighten my wallet.  I’ve searched quite a bit and not found much regarding 405  for pathfinders. Google AI stated EGR valve is the culprit.  Before getting into this, I wanted to see if anyone had some thoughts as to the 405 code. Not sure I trust AI enough for this. Thanks for any tips.

[Dan.NY]

EC section of service manual does not show dtc 405 . It shows 400 402 and skips to catalytic.  I can’t find 405 anywhere. Anyone know what section this code is in?

[hawairish]

Haven't dealt with this on my Pathfinder fortunately, but did on my 98 Frontier.  It sucked.  Charcoal pellets all the way from the rear of the truck to the solenoid valve in the engine bay.  My issue produced a P1444 (purge solenoid valve) but the codes in that series tend to be related, and in my case the code was brought about by a ruptured charcoal canister.

 

Blowing and vacuuming the lines is not enough.  The charcoal crumbs get jammed together in the lines.  You need to use a stiff, but flexible, wire to push through every hard line, and it may be necessary to remove any hoses.  Flush the lines with pressured water if possible, but house pressure is fine.  Then continue to blow and vacuum the lines using whatever attachments you can to maximize pressure.  Repeat this couple times.  Any little charcoal crumb will eventually clog the line or find its way into the solenoid.  My long term solution there was to put a transparent fuel filter on the line right off the canister.

 

BTW, the solenoids can be fixed if they clog, since they're not cheap to replace.  You just bend the little metal tabs in a little and split the coil portion from the plunger.  Some pins/needles can dislodge pieces that are blocking the valve.  The solenoids are also commonly used on other Nissans (the one on my 04 Pathfinder is identical to the one on my 98 Frontier).

 

Not sure about the "405".  What are you using to pull codes?  Is the code exactly "P0405" on screen?  Reason for asking is because in 98, you could pull "codes" directly from the ECU without a scanner, but the code it flashed was not the DTC "P" code.  The FSM was needed to convert the ECU code to the DTC code.  I'm not seeing "0405" as an ECU nor DTC code in the 98 R50 FSM, so that's why I'm curious about what's being used to pull the code.  Maybe it's P0450 (control system pressure sensor) and there's a leak if a hose was disconnected or misrouted?

 

 

[Dan.NY]

Thanks. You nailed it.   Mechanic wrote P0405 code on my paperwork and I didn’t check myself… until a short time ago. It’s in fact a P0450…  Pulling with my hand scanner. It’s just a case of transposing the numbers. Ughhhh. Now it’s seeming like a new Evap control system pressure sensor is in my future. It’s not been changed yet and seems like a good candidate. 

[hawairish]

7 hours ago, Dan.NY said:

Thanks. You nailed it.   Mechanic wrote P0405 code on my paperwork and I didn’t check myself… until a short time ago. It’s in fact a P0450…  Pulling with my hand scanner. It’s just a case of transposing the numbers. Ughhhh. Now it’s seeming like a new Evap control system pressure sensor is in my future. It’s not been changed yet and seems like a good candidate. 

 

Good deal.  Hopefully easy fix...as before, check for anything jammed in the lines or ports.

 

It's amazing how much of a mess a busted canister causes.  Hopefully the canisters weren't too outrageously priced.  For my truck, RockAuto wanted $140 I think for a replacement, yet replacements for similar year Nissans were only $30.  I bought a new one for a Maxima and it had a slightly different mounting setup and one small change in a port size...made it work with little more than a couple nylon spacers and longer hardware.  Still works 8 years later.