Inspection
Thread Starter
6th Gear
Joined: Jul 2019
Posts: 6
Likes: 1
Inspection
I have a 2002 C5, I haven’t been able to pass the inspection due to P0410 code. I have change out the upstream o2 sensors, the air pump, drove it 100 miles.
Im at my witts end on this. Any suggestions on what’s left that I may be overlooking, would greatly be appreciated.
Im at my witts end on this. Any suggestions on what’s left that I may be overlooking, would greatly be appreciated.
5th Gear
Joined: May 2020
Posts: 5
Likes: 3
From: Massachusetts
I had this code pop up on my DIC just prior to working on my car. I was replacing the small vacuum line off the map sensor on the back of the intake manifold that goes to the vacuum reservoir. I had a pretty big vacuum leak, which is the common reason for the interior vents not operating correctly, that was throwing my lean codes in addition to the P0410 being in. During this I had removed the intake and intake manifold. It my case, for the P0410, it could have been an issue with the vacuum line or possibly the 1 inch (aprox) air hose that enters the intake box from the drivers side having a kink in it. I am not sure which of these issues was the cause, or which one fixed it, but the code cleared and has not come back since (over 3 weeks and several hundred miles. Hope this is helpful to you.
Melting Slicks
Joined: Jul 2004
Posts: 3,294
Likes: 482
From: Brea CA
Most likely the small vacuum line that starts at the back of the manifold and goes to the vacuum canister in the passenger fender area.
This is known to deteriorate over time and if a battery ever leaked the deterioration would be accelerated.
One quick check as was mentioned in the above post, to the HVAC vents work properly. If you set it for defrost does the air only come out of the top dash vent? If set to the foot wells does air only come out of them. If the answer is that no matter what setting the vents are set to air comes out of all, then the vacuum line is bad.
The AIR pump on 2000 and up C5's has a vacuum controlled valve next to the air pump. If this valve does not open then you get the P0410. It is a 90% chance that the issue is around the battery and vacuum canister area. It may require replacing the vacuum line from the intake manifold to the vacuum canister. Been there done that on multiple C5's.
Gary
This is known to deteriorate over time and if a battery ever leaked the deterioration would be accelerated.
One quick check as was mentioned in the above post, to the HVAC vents work properly. If you set it for defrost does the air only come out of the top dash vent? If set to the foot wells does air only come out of them. If the answer is that no matter what setting the vents are set to air comes out of all, then the vacuum line is bad.
The AIR pump on 2000 and up C5's has a vacuum controlled valve next to the air pump. If this valve does not open then you get the P0410. It is a 90% chance that the issue is around the battery and vacuum canister area. It may require replacing the vacuum line from the intake manifold to the vacuum canister. Been there done that on multiple C5's.
Gary
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,600
Likes: 4,059
From: Cape Coral, Florida
First off it was probably unnecessary to replace the O2’s for a P0410 !!...yes, the O2’s are looked at to make sure they go lean during the test...if you have a Tech 2 or any bi directional scan tool it’s a pretty easy diagnosis...does the air pump operate when the car is initially started when cold ??...yes, the system need vacuum to the solenoid (above PCM) and when open allows the diverter valve (if OK) on the AIR pump to open allowing the pump to allow air flow into the exhaust manifold...You can see if you have vacuum at the diverter valve vacuum line when the pump comes on but the PCM’s AIR test only happens when the system is in “closed loop”...the AIR solenoid is ground side switched so with the key ON if you take a 12 volt test light connected to ground and touch it to the purple (control) wire on the solenoid by back probing it you should hear the solenoid “click” !!...make sure you have 12 volts on the pink wire too !!.., it can even be a bad driver that is not allowing the ground to work at the PCM... if that were the case you would need a new PCM
!!
enclosed is a good video (2 parts) explaining the system...you MUST understand the theory and operation before trying to diagnosis !!
!!
enclosed is a good video (2 parts) explaining the system...you MUST understand the theory and operation before trying to diagnosis !!
Last edited by C5 Diag; Jun 24, 2020 at 06:05 PM.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,600
Likes: 4,059
From: Cape Coral, Florida
Thread Starter
6th Gear
Joined: Jul 2019
Posts: 6
Likes: 1
I’m just now getting back to work on this problem, now the air pump works.
the inspection report says the the catalyst is not ready and ho2 is not ready also
any ideas on what to do would be great
and I have changed out the upstream o2 sensors also.
Thanks for any help with this problem
the inspection report says the the catalyst is not ready and ho2 is not ready also
any ideas on what to do would be great
and I have changed out the upstream o2 sensors also.
Thanks for any help with this problem
