Problem with my 2004 Chevy Trailblazer
Mileage = 82000
Engine size 4.2
dash lights = Check Engine light
codes = P0410
work done prior = Replaced O2 sensors a year ago.
tip/donation yes
tech = MW
question = Pulled the check valve. Applied 12V. Center "piston" cycles
up and down but I don't see anything else move. Is that normal or
should something else be moving?
All I hear when I turn the ignition "on" is a whir for a couple of
seconds. AIR?
Checked fuses. All good. If this sound like the valve is good, next
stop is checking the under hood and under car relays, right?
Have a subscription to Alldata but it does not talk about checking
relays, only gives 58 steps to diagnostics, most requiring cycling things
on and off via the code tool.
Any help will be greatly appreciated.
Starting vacation on Friday and would like to clear this up.
There are TSB's on this. Any chance my Dealer would fix this at no
charge?
MW:
Thank you for the tip/donation.
Hello and welcome.
The bulletin you are refering to is just an update to the diag. chart. The original chart does
not say that a faulty #1 o2 sensor can cause this, but it can. If no other problems are found,
then replace #1 02 sensor. The other bulletins dont seem to apply.
Most of the time the valve is the problem. but it sounds like it is working. Using a scanner to
turn things on and off and watching 02 sensor readings is really the key to this diag. With
the valve still on engine, and engine running, aniother way is to jumper it as you have,
Ensure the AIR outlet hose is removed from the AIR shut-off valve.
Connect a Fused Jumper Wire from battery positive voltage to either terminal of the AIR
solenoid.
Start and idle the engine.
Momentarily touch the other terminal of the AIR solenoid to a good ground with a jumper
wire, 5 times for a duration of 2 seconds each.
Is an audible exhaust sound heard at the inlet of the AIR shut-off valve, each time the circuit
is connected to a ground,
if yes, then the valve is working.
The pcm grounds the 'air sol' relay #55 in underhood block when parameters are met. That
is why using a scanner to manipulate is important. This is all asuming the AIR pump works.
Again, a scanner to manipulate these things is needed since there are many parameters
that need to be met before pump will turn on.
There may also be a pcm re-program that addresses this problem, but the only way to tell is
to have the dealer scanner on it and check.
Since you are way over on mileage warranty, dealer most likely will not give assistance
since there is bulletin, not recall. If mileage was close to 36k, they may have.
Mileage = 82000
Engine size 4.2
dash lights = Check Engine light
codes = P0410
work done prior = Replaced O2 sensors a year ago.
tip/donation yes
tech = MW
question = Pulled the check valve. Applied 12V. Center "piston" cycles
up and down but I don't see anything else move. Is that normal or
should something else be moving?
All I hear when I turn the ignition "on" is a whir for a couple of
seconds. AIR?
Checked fuses. All good. If this sound like the valve is good, next
stop is checking the under hood and under car relays, right?
Have a subscription to Alldata but it does not talk about checking
relays, only gives 58 steps to diagnostics, most requiring cycling things
on and off via the code tool.
Any help will be greatly appreciated.
Starting vacation on Friday and would like to clear this up.
There are TSB's on this. Any chance my Dealer would fix this at no
charge?
MW:
Thank you for the tip/donation.
Hello and welcome.
The bulletin you are refering to is just an update to the diag. chart. The original chart does
not say that a faulty #1 o2 sensor can cause this, but it can. If no other problems are found,
then replace #1 02 sensor. The other bulletins dont seem to apply.
Most of the time the valve is the problem. but it sounds like it is working. Using a scanner to
turn things on and off and watching 02 sensor readings is really the key to this diag. With
the valve still on engine, and engine running, aniother way is to jumper it as you have,
Ensure the AIR outlet hose is removed from the AIR shut-off valve.
Connect a Fused Jumper Wire from battery positive voltage to either terminal of the AIR
solenoid.
Start and idle the engine.
Momentarily touch the other terminal of the AIR solenoid to a good ground with a jumper
wire, 5 times for a duration of 2 seconds each.
Is an audible exhaust sound heard at the inlet of the AIR shut-off valve, each time the circuit
is connected to a ground,
if yes, then the valve is working.
The pcm grounds the 'air sol' relay #55 in underhood block when parameters are met. That
is why using a scanner to manipulate is important. This is all asuming the AIR pump works.
Again, a scanner to manipulate these things is needed since there are many parameters
that need to be met before pump will turn on.
There may also be a pcm re-program that addresses this problem, but the only way to tell is
to have the dealer scanner on it and check.
Since you are way over on mileage warranty, dealer most likely will not give assistance
since there is bulletin, not recall. If mileage was close to 36k, they may have.
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