Just thought I would post this cross-reference for X300 Secondary Air Injection Pump - I thought mine was out so when I went to get another, found out that the 95-99 Corvette uses the same pump.

But it never occurred to me to check the pump with a direct hook up, so now I have two good pumps and still have p0411...

I think I have ruled out the relay (by swapping them around) so now I guess I will check for voltage at the relay - to see if possibly there's a disconnect between there and the ECU, or maybe the ECU not sending the signal.

It used to work when I first got the car in 2005 - I would hear a click and whirring sound,

I've had the condition for years, but now, I want to get all my check-engine / low washer / etc. lights out.

I am on a restoration 'kick' for a bit.






Secondary Air Injection pump - GM Corvette 95-99

 

You do realize that these TSBs are in the large file download area??????

When I was at the dealer we lived to try to get the P0411 DTC to keep from flagging but some cars just seem to like this fault.

The check valve on the pipe will be a challenge. Try not to twist the pipe when replacing the valve.

You can monitor the O2 sensors while the pump is running with a generic scanner instead of using PDU.

Diagnosis instead of 'throwing parts at it' will be cheaper in the long run but both approaches work eventually.

bob gauff

 

Thanks Bob - I completely missed the one about changing out after serial # 770something - I am # 750732.

I will re-scan the docs.

Lee Shelton
Memphis
1995 XJ6

 

Yep, this is on my list too.

The mechanic says the older pumps all(generally speaking) eventually fail and this code was very common.

Al

 

I have never been able to find the large file download area.

 

Well since I uploaded hundreds (thousands??) of documents to this area I have never needed to actually look for them as I have them on 4 or 5 computers here in my possession.

I guess I am an info freak when it comes to cars I work on or own.

I have been TOLD that they are there for the 'downloading'.

bob gauff

 

Bob,

I have a replacement valve, and was wondering if there is a special technique for removing & installing the valve so that the pipe doesn't get twisted, and how one determines the final torque to appropriately tighten the new valve especially since it uses a crush/sealing washer.

.

 

Just my two penneth' due to corrosion and the thin wall of the pipe entering the valve, my experience ends most times with the pie shearing off at the joint. I didn't think that heat would help the inner parts either. After trying to recover several from breakers yards, I thought about using carb cleaner, lots and letting it soak and then repeating until clear fluid drained. Seems to have worked for me. Incidentally I did this with an XJ40 head turned on its back to clean the valves and stems when changing a head gasket. Unconventional, but works

 

So, get this... after a year of the p0411 code reappearing, the CEL went away a couple months ago. The p0411 had been pretty reliably showing up enough to re-light the CEL within a week or so after clearing it, and the last time I just didn't bother, so the CEL had been lit for some time. ....then it just went away one day.

I didn't know that a CEL would eventually clear itself, assuming the code aged out if it wasn't being set, but apparently it does.

So I guess my air pump got a second wind for a while It's probably short lived I suspect though. So I'll have to keep it on my shopping list.


BTW, I know the CEL light bulb is still good based on the bulb check on startup.

Interesting....

.

 

The OBD on these cars isn't all that great. It can be hard to differentiate between actual faults and mere oddities of the OBD system itself.

I had a P0411 once. Pump failed. I unplugged the pump and cleared the code. The code never reset! I was a bit surprised that a fully disabled pump wasn't recognized when, 5 minutes before, a code P0411 was set.

Seemingly random P0430/420 codes set over the years with no running problem at all but no codes set when sensors and coils were unplugged!

Go figure

On my XJR the OBD II was more of a torment than a benefit.

Cheers
DD

 

 

On the topic of air pumps...

I've noticed a weird noise whenever I pull away on a cold start (or if the car has sat for over an hour or so). Before changing to 2nd gear, I hear a distinct "woosh" that almost sounds like a turbo blowoff, but lower in pitch. It doesn't come back again. Is this the air pump? I can't say I've ever heard it on another car, and I don't remember if it happened when I got the car or started a few months after.

 

I sorta doubt it. The air pump itself makes a 'zing' sound, and there's no blow-off or diverter valve aspect to the operation of the system

Cheers
DD

 

Thanks, Doug.

I'm now wondering what this is and whether it is fatal. Blocked transmission filter, maybe? It only happens once per drive at cold startup.

 

I'm having the same problem. Fuse blows every time the pump domes on. I took the pump off and bench tested it and it operates normally. The solenoid opens and the fan goes on. I also removed cleaned and tested all relays under the hood as my drivers handbook locations for the air injection relay is not very specific.
I tried to remove the check valve but absolutely no luck there. It seems to be stuck and I don't want to twist the pipe. I disconnected the air out take from the pump and it still blows fuses.
The manual says that fuse is for the air in Junction and purge valve but I can't seem to find a purge valve anywhere along the system. Does anybody know the purge valve location for a 1995 jaguar X JS 4.0?

 

The fuse needs to be 30 AMP.
The newer pumps were a higher output and required more power.

Even with the upgraded pumps and replaced check valves some ECMs STILL see faults with the air pump. I don't live in an EPA non-compliant County in rural Texas so I really gave up on trying to fix this issue. I tell the local customers to ignore the fault and go on with there lives.

The check valve is ALWAYS tight and the pipe often twists.

The electrical guide lists the components locations.

bob

 

Yep, mine comes and goes.... I just ignore it so far. It's been "gone" for a while now, but I have little confidence that it will remain at bay as it has cycled so many times now.

 

These air pumps are a big PITA , they will drive you crazy . Many have either removed them or just unplugged it. For inspection just turn the check engine light off via a code reader.
Lawrence

 

Lawrence:
I don't know where you have "inspections", but most everywhere I know requires the OBD readiness checks to have passed, and they are "unpassed" by the code reset function!

 

PA has emissions and safety inspection once a year, about $100 (if your car needs nothing, VERY RARE, they always find something) if your car is driven under 5,000 miles a year you are exempt but still have to pay the fee for your IM sticker, about $25. If your check engine light is on they won't inspection it exempt or not. As said you can turn it off with a code reader, I don't know how anyone knows you erased the code light. Of course if your car doesn't pass the sniff tester, no sticker light or not.
Florida has no inspections.