DTC P1410

[fixkick]

the TPC secrets #1 above is cover here,  a 1 psi reg.
  tank pressure control or TPC, #3 IS  VACUUM CONTROL NIPPLE. and opens valve 100% , when closed, Oriface A limits flow max and is a 1PSI regulator to tank.
that 1PSI rule is what the test is looking for p0410

https://fixkick.com/sensors/EVAP/Evap-testing.html



wow i have tank sensor voltages too there. at LINKed page. just above.
the TPC car parked is a 1 psi fume pressure regulator, , if working now, the TANK on  warm day rises to 1PSI pressure. (CAP removed at filler and  hear whoossh sound bingo for 1psi.
the TPC is controlled. by device 12 green drawing (+PCM) 
when driving NORMAL  and moving hot engine, in closed loop, the TPC VALVE opens fully. sending all fumes to CANister.
then the PCM wants to do what i called he evap monitor p01410?  TEST . next.

(DTC test now)   after normal cruising it does this. test.
what does THE PCM do  NOW...?

tank FUEL GAUGE sensor 8 shows not full 3/4 full or less?   (fuel gauge not failing?)
moving hot engine closed loop and it closed #9 and closes #1 TPC via #12 (causing pressure to build, same as when key off parked)
the PCM then takes readings off #7 sensor (PSI EVAP FUME sensor)
if it reads wrong it fails. and stores this DTC ERROR.  (1 PSI IS PASS, WAY LESS IS FAIL) 0 PSI EXAMPLE IS GAS CAP MISSING.

TPC must  not  be stuck  OPEN. ever. for sure now. AT monitor test time evap.

and the green path page 1 above, not breached in any way.
even a 0.040" drill sized hole fails this, even the gas cap seals..

the horrors of EVAP,  
the green fail path is a monster. vast things there can and do fail, HUGE.  22 years old. all seals , hoses ,gaskets, can and do fail .
if TPC is good. #1 , #2 and #9 are all ok,  and new cap,  only smoke machined for say $99 works (diy kits $50)
some shops fear evap work,  so over charge for it $1000 up  + parts. or more $ rusted top of tank as many are. for ages
all valves can be bench tested, and for sure blow tested with lips, as Duanes video shows.(first post)
the bench test 12vdc battery makes that more easy, to test open and closed, all valves solenoids here
and if all that passes,  a smoke machine finds he true leaks, but is a tricky test,  as parked valves are struck open some. or stuck closed, (check carefully)_

the frustration of mechanics is we can not do smoke test moving fast, at DTC p1410 moments.  no can do, and is REAL.

so in a shop  we test the valves and know they work then all that are stuck open parked we plug up, first.
if frisky (fat wallet) replace the valves 1 by 1, cheap to expensive. or smoke test TPC hose to the rear first, if the tool is handy.
my jeep has factory smoke injector port, it is so important of test.
the TPC must not smoke on the vacuum nipple port.  use vacuum hand tool  on the nipple here and it must not leak down or the diaphragm  inside is cracked.

one way to inject smoke if TPC is good tested, is to inject, at TPC rear nipple in photo above blowing smoke to the rear, now that finds  the hard cases.

Duane calls testing all valves (benched) is critical thing , as he has no dreams of crawling under car smoking like mad, no fun there, so he tests all valves first.
or replace the HOT listed ones, first (statistics) green drawing part #1, #12 and #9, based on price or if sold in town, as  most are not. Tracker parts are never easy to   buy.
its just 2 things vents fail  or controls fail.
the former is the domain of smoke testing.

yes it is  a very fragile system (as they age)
the valves can stick  , any of them
i fixed mine by spraying mine last week with silicon spray,  and they unstuck and now work  , 1cent of spray,  
or just the gas cap loose,   or spray the vacuum breaker in the center of the cap with silicon spray oil.

all the best to you and your's   , happy new year too.