BaysideRS4

I typed this up for someone in an email, thought I would post it here. Everyone should have the factory repair manual, but in case you don't.

A/C must be off during all of this. Coolant temp at least 185 deg F.

Erase any DTCs

Diagnosis of EVAP canister purge regulator valve
engine at idle
Basic settings: 070
If test is not initiated or the display jumps from test on to test off slightly accelerate engine briefly, test will be repeated
EVAP OK should appear

Diagnosis of tank leak test
This diagnostic is locked the first 230 seconds after engine is started
engin at idle
intake air temp less that 95 celcius (004 I believe)
basic settings 071
test duration appox 60 seconds
should the diagnosis be repeated several times, open fuel filler cap each time to release pressure in tank
System OK should appear

Diagnosis of fuel supply system
engine at idle
oxygen sensor control active
basic settings 107
If test on does not appear turn engine off and restart, repeat
System OK should appear

Diagnosis of oxygen sensor heater
basic settings 041
increasing engine speed accelerates the obtaining of specified values
basic settings 042

Diagnosis of oxygen sensor aging before catalytic converter
engine running at 1900-2200 rpm
basic settings 034
B1-S1 OK should eventually show
basic settings 035
B2-S1 OK should show

Diagnosis of operational readiness of oxygen sensors behind TWC
engine at idle
basic settings 036
B1-S2 OK and B2-S2 OK should display

Diagnosis of oxygen sensor control system
engine at idle
basic settings 037
System OK should eventually display
basic settings 038
System OK should eventually display

Diagnosis of oxygen sensor behind catalytic converter
engine running at 1900-2200 rpm
basic settings 043
B1-S2 OK should eventually show
engine running at 1900-2200 rpm
basic settings 044
B2-S2 OK should eventually show

Diagnosis of catalytic converter
engine running at 1900-2200 rpm
basic settings 046
the test duration for the catalytic converter takes approx 60 seconds
Cat B1 OK should eventually display
engine running at 1900-2200 rpm
basic settings 047
Cat B2 OK should eventually display

food111

please would you mind telling me what readiness used for? why do we do readiness code ? is it used when we erase the fault codes and don't come back so by doing readiness the fault code in a short time?

complacentsee

You force the readiness to be checked withing a short 20 minute time frame. Otherwise it will take however long it takes you to drive in all those specified ways, usually a couple days of driving and some highway driving if all you do is city driving.

you need readiness set to pass emissions.

thejulex

It might help you pass emissions with broken cat, for example, as you can force the OBD system to signal readiness to emissions check equipment even though you car is not really ready. It takes several days of driving for readiness to be normally set during which any faulty emissions subsystem will have time to report problems and pop check engine light.

food111

where can i do readiness by vag com? is it by basic setting or readiness button?
by the way, why do we do basic settings for cat, front and rear o2 sensor is to make sure whether they operate good or not?

x Wild Bill x

Another question along the lines of food, so you can do this and it will force readiness on the emissions stuff so you can run to the inspection station and pass emissions? If so, can someone please explain how to do this. I would be forever grateful.

Thanks,
Bill

kepstein

Can you elaborate. I am in this situation with a faulty cat. I am due for inspection next month, and I was going to just reset the fault code to shut of the CEL. Should I also reset readiness code?

Thanks,
Ken

massboykie

Hey Bayside

Nice post.

Some additional info. A link to a "quick reference" version for future "searchers". It's on the last page of the doc:
http://www.vaglinks.com/Docs/Audi/C5...0Reference.pdf

Cheers
Massboykie

~DonQPremiumTequila~

Great post.

donromani

The original post explains just how to do that. You will need the VAGCOM tool and software to force the car to run the tests.