04 Cayenne turbo/ p0492 code/secondary air injection bank 2

[Mr. Haney]

I get this fault, seems like after its been idling. I get the fault second time now in 1 week. I have cleared them via the scanner. I drove the vehicle home for 1100 miles after I bought it and the code didnt show up for two days after I got it here. Could this be related to a pcv valve? I really need help with this one I dont have a manual yet, could anybody provide a workflow for this? Thanks-

Edited October 21, 2010 by Mr. Haney

[odix]

Hi -- if you become a contributing member you can download manuals, technical service bulletins, etc.

[Loren]

I get this fault, seems like after its been idling. I get the fault second time now in 1 week. I have cleared them via the scanner. I drove the vehicle home for 1100 miles after I bought it and the code didnt show up for two days after I got it here. Could this be related to a pcv valve? I really need help with this one I dont have a manual yet, could anybody provide a workflow for this? Thanks-

P0492 Secondary air injection system, bank 2 - below limit

Possible causes:

- Fuse F4 faulty

- Open circuit to secondary air injection pump

- Short circuit to ground in the lead to the secondary air injection pump

- Secondary air injection pump relay mechanically faulty

- Secondary air valve sluggish

- Secondary air injection pump (air cleaner) blocked

- Air hose to secondary air injection pump slipped off or is crushed

- Secondary air injection pump faulty / stuck

[Mr. Haney]

Thanks a million Loren! Fuse F4 was blown, now to find the cause......

[mudman2]

0492 can be coils related

[Mr. Haney]

0492 can be coils related

Elaborate please! Personal experience? I havent had it come back, but I havent gotten into the coils for a crack check either-

[Mr. Haney]

I get this fault, seems like after its been idling. I get the fault second time now in 1 week. I have cleared them via the scanner. I drove the vehicle home for 1100 miles after I bought it and the code didnt show up for two days after I got it here. Could this be related to a pcv valve? I really need help with this one I dont have a manual yet, could anybody provide a workflow for this? Thanks-

P0492 Secondary air injection system, bank 2 - below limit

Possible causes:

- Fuse F4 faulty

- Open circuit to secondary air injection pump

- Short circuit to ground in the lead to the secondary air injection pump

- Secondary air injection pump relay mechanically faulty

- Secondary air valve sluggish

- Secondary air injection pump (air cleaner) blocked

- Air hose to secondary air injection pump slipped off or is crushed

- Secondary air injection pump faulty / stuck

Hey thanks Loren- maybe you could help with a couple other q's? I keep blowing fuse #4.

1. If I apply 12v to the air pump itself, should it run?

2. Which air pump is fuse #4-40amp, in the underhood fuse comp. linked to? Pass. or drivers side?

3. What do relays 19&20 in the underhood fuse comp. link to?

4. I have continuity and 0 ohms resistance on the drivers side air pump, the only one I messed with.

5. Do you know where the air pump ground goes?

6. Are the air pumps ac or dc?

7. Does the air pump relay function by providing a ground to complete the curcuit or by applying power?

8. What condition tells the computer to run the air pumps?

I know this is a laundry list of q's so, I thank anyone who can help in advance as I'm kinda tapped out money wise right at the moment. I just picked up the vehicle and have all those expenses.:)

[Loren]

I get this fault, seems like after its been idling. I get the fault second time now in 1 week. I have cleared them via the scanner. I drove the vehicle home for 1100 miles after I bought it and the code didnt show up for two days after I got it here. Could this be related to a pcv valve? I really need help with this one I dont have a manual yet, could anybody provide a workflow for this? Thanks-

P0492 Secondary air injection system, bank 2 - below limit

Possible causes:

- Fuse F4 faulty

- Open circuit to secondary air injection pump

- Short circuit to ground in the lead to the secondary air injection pump

- Secondary air injection pump relay mechanically faulty

- Secondary air valve sluggish

- Secondary air injection pump (air cleaner) blocked

- Air hose to secondary air injection pump slipped off or is crushed

- Secondary air injection pump faulty / stuck

Hey thanks Loren- maybe you could help with a couple other q's? I keep blowing fuse #4.

1. If I apply 12v to the air pump itself, should it run?

2. Which air pump is fuse #4-40amp, in the underhood fuse comp. linked to? Pass. or drivers side?

3. What do relays 19&20 in the underhood fuse comp. link to?

4. I have continuity and 0 ohms resistance on the drivers side air pump, the only one I messed with.

5. Do you know where the air pump ground goes?

6. Are the air pumps ac or dc?

7. Does the air pump relay function by providing a ground to complete the curcuit or by applying power?

8. What condition tells the computer to run the air pumps?

I know this is a laundry list of q's so, I thank anyone who can help in advance as I'm kinda tapped out money wise right at the moment. I just picked up the vehicle and have all those expenses.:)

P0492 Troubleshooting.pdf

Perhaps you would consider a donation to this site?

[Mr. Haney]

I get this fault, seems like after its been idling. I get the fault second time now in 1 week. I have cleared them via the scanner. I drove the vehicle home for 1100 miles after I bought it and the code didnt show up for two days after I got it here. Could this be related to a pcv valve? I really need help with this one I dont have a manual yet, could anybody provide a workflow for this? Thanks-

P0492 Secondary air injection system, bank 2 - below limit

Possible causes:

- Fuse F4 faulty

- Open circuit to secondary air injection pump

- Short circuit to ground in the lead to the secondary air injection pump

- Secondary air injection pump relay mechanically faulty

- Secondary air valve sluggish

- Secondary air injection pump (air cleaner) blocked

- Air hose to secondary air injection pump slipped off or is crushed

- Secondary air injection pump faulty / stuck

Hey thanks Loren- maybe you could help with a couple other q's? I keep blowing fuse #4.

1. If I apply 12v to the air pump itself, should it run?

2. Which air pump is fuse #4-40amp, in the underhood fuse comp. linked to? Pass. or drivers side?

3. What do relays 19&20 in the underhood fuse comp. link to?

4. I have continuity and 0 ohms resistance on the drivers side air pump, the only one I messed with.

5. Do you know where the air pump ground goes?

6. Are the air pumps ac or dc?

7. Does the air pump relay function by providing a ground to complete the curcuit or by applying power?

8. What condition tells the computer to run the air pumps?

I know this is a laundry list of q's so, I thank anyone who can help in advance as I'm kinda tapped out money wise right at the moment. I just picked up the vehicle and have all those expenses.:)

P0492 Troubleshooting.pdf

Perhaps you would consider a donation to this site?

Yes, absolutely, thank you!!!!

[Brit6]

Bumping an old thread instead of making a new one.

My 04 CTT has been idleing a little rough and the CEL came on just today, code P0492. The coils are not cracked "05" version. I guess i should bring it to a mech to check the things on the list?

0492 can be coils related

[Brit6]

Did you find the problem Mr. Haney?? I keep getting the P0492 code, i erase it and it keeps coming back. It doesn't like something haha

I get this fault, seems like after its been idling. I get the fault second time now in 1 week. I have cleared them via the scanner. I drove the vehicle home for 1100 miles after I bought it and the code didnt show up for two days after I got it here. Could this be related to a pcv valve? I really need help with this one I dont have a manual yet, could anybody provide a workflow for this? Thanks-

P0492 Secondary air injection system, bank 2 - below limit

Possible causes:

- Fuse F4 faulty

- Open circuit to secondary air injection pump

- Short circuit to ground in the lead to the secondary air injection pump

- Secondary air injection pump relay mechanically faulty

- Secondary air valve sluggish

- Secondary air injection pump (air cleaner) blocked

- Air hose to secondary air injection pump slipped off or is crushed

- Secondary air injection pump faulty / stuck

Hey thanks Loren- maybe you could help with a couple other q's? I keep blowing fuse #4.

1. If I apply 12v to the air pump itself, should it run?

2. Which air pump is fuse #4-40amp, in the underhood fuse comp. linked to? Pass. or drivers side?

3. What do relays 19&20 in the underhood fuse comp. link to?

4. I have continuity and 0 ohms resistance on the drivers side air pump, the only one I messed with.

5. Do you know where the air pump ground goes?

6. Are the air pumps ac or dc?

7. Does the air pump relay function by providing a ground to complete the curcuit or by applying power?

8. What condition tells the computer to run the air pumps?

I know this is a laundry list of q's so, I thank anyone who can help in advance as I'm kinda tapped out money wise right at the moment. I just picked up the vehicle and have all those expenses.:)

P0492 Troubleshooting.pdf

Perhaps you would consider a donation to this site?

Yes, absolutely, thank you!!!!

[the head]

Since there is a thread already I'll add to it. Same P0492 code. Did the troubeshooting and found the bad fuse and while I was at it decided to check the relay and then the pump itself since there is another thread describing the impeller failure in the unit itself. Lo and behold that's my issue. I took some pics of the carnage, but also one of the good blower with the cover off to you can see what it's supposed to look like. I also had to pick pieces out of the hose itself leading to the valve behind the engine block. The cover is held on by the single screw so it's easy to inspect while still fully installed. So if anyone runs into this in the future, you can check the pump and the fuse quickly before moving through the rest of the procedure.

[Brit6]

Nice work, i fixed mine as well. The plug came right out of the socket and was just hanging lose. I plugged it in and i have not had the error since.

I did open my pumps just to double check and they looked fine.

Now if only i could fixed my heated seat issue.

[the head]

Wanted to post a follow-up. I had a piece of impeller blade make it to the one-way valve and lodge it open. This valve is at the end of the rubber hose the pump pushes the air through. It bolts to the back of the block and I can say with certainty that you need to come in from under the car to get to those two bolts with a long extension (forget what size e-torx it was). There is a gasket, but it didn't tear luckily. So make sure you check the hose otherwise you'll get exhaust backflowing up into a plastic pump...

[jmarkoa]

the head,

Can you describe what the open valve sounded like? My 04 turbo with 100K started making a "thumping" noise; not really like a rod beginning to knock, but similar. No check engine light so no code to report, just a noticeable low pitched thumping only at idle speed. It seemed to come and go for a few weeks, then became a constant nuisance. I took it to the dealer for my 100Kcheckup, they said it sounded like an open SIA valve on the drivers side. They quoted $700 to replace it, and I am considering just doing it myself. Were you able to remove the broken plastic pieces and free up the valve, or did you just replace it? If replaced, how much? The cheapest I could find was $125. From your post above, it sounds like it may be a quick fix? BTW, the dealer said they have never done one, this would be their first one.

Great photos of the air pumps!! Were you able to snap any of the valve or its location? Thanks for anything additional you can add!!

[the head]

No noise that I recall so there was no warning. I replaced it since the vanes that serve to move the air were all broken off. That price sounds good, I paid about $160 You can check the valve pretty easily - just disconnect the driver's side air hose from the pump there in the engine compartment. If it blows exhaust then it's bad. It's just a simple one-way valve so there is no power or vacuum required to actuate it. The air pump just overcomes the flapper and pushes air into the cat. I recall it took a universal joint and a lot of extensions to reach it and even then I had to get the socket into place by feel with my hand -it took some patience.