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Discussion Starter · #1 · (Edited)
This post is to decode your secondary air pump out of your OBDII 2.0 Golf/GTI, Jetta &Cabrio.
***Please note, I am in NO WAY suggesting you disable the SAI pump to accomidate after-market superchargers, cutom intake manifolds, or to simply remove it because the pump sh*t the bed. The SAI pump is part of the emissions system of the car and is a Federal offense to remove any emission equipment that came from the factory. The information given is mainly for engine swaps into earlier generation VW's that did not come with the pump originally.
***


There are ECU coding tables on page ST-25 of the Bentley manual that list the different coding states of the car's ECU. First table is the code for manual/auto tranny. Second table is for OBDI cars with/without EGR.
The bottom paragraph gives the code to either equip or unequip the secondary air injection pump. The first two codes are TIER 1 & Tier 2. This represents an ECU NOT coded for the air pump. TLEV 1 & TLEV 2 ARE for ECU's coded for an air pump. I am not positive about the Cabrio's. Looking at that table woul lead me to believe that all Cabrios came with a SAI pump. IMHO, changing the coding to 0000 would work because its the same as the Golf/Jetta.
You will need a registered version of VAGCOM to perform this change. Simply follow the directions at the bottom of the table and you will be all set. http://****************.com/smile/emthup.gif
 

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Re: Decode Secondary Air Injection Pump in your 2.0 (redskins98)

Almost seems kind of a random thing. My car came with it, but I replaced the ECU with one from a car that didn't have it. Before I found out how to decode it for free
 

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Re: Decode Secondary Air Injection Pump in your 2.0 (tdogg74)

Quote, originally posted by tdogg74 »
I am not positive about the Cabrio's. Looking at that table woul lead me to believe that all Cabrios came with a SAI pump.

I checked the VW Repair Manual and Cabrios shoud set it to 2 or 3 depending on manual/auto tranny.
I tried to find this info for MK4, but the MK4 ECUs can only be coded for tranny type, abs and airbags. So I believe here you have to change the ECU.
 

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Re: Decode Secondary Air Injection Pump in your 2.0 (randallhb)

Quote, originally posted by randallhb »
I tried to find this info for MK4, but the MK4 ECUs can only be coded for tranny type, abs and airbags. So I believe here you have to change the ECU.

Is this true? Anyone else try it?
 

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Re: Decode Secondary Air Injection Pump in your 2.0 (v-tecs suck)

Quote, originally posted by v-tecs suck »
Is this true? Anyone else try it?

I've looked in the MK4 Bentley and I did not see any options for recoding. However, I was tired and not too persistant in my search...
 

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Re: Decode Secondary Air Injection Pump in your 2.0 (v-tecs suck)

my pump is dead and it give me a CEL ... for now its just sitting in there... as it doesnt really do anything but heat up the cat
 

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Re: Decode Secondary Air Injection Pump in your 2.0 (jfreethy)

I believe a CEL can be thrown for 2 reasons.
1) if you remove the SAI relay. The code will be something about an "open circuit"
2) if the ECU runs a test and detects that O2 levels don't indicate that
the SAI pump is running. Code will be something like "incorrect flow detected"

The first can be avoided by a resistor or just leaving the relay in.
But the 2nd can not be avoided.... at least not easily. You would have to
alter the O2 sensor signal whenever the SAI pump is suppose to run.




Modified by elRey at 8:42 AM 5-1-2006
 
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