VCDS

VAGCOM Block Cheat Sheet

Basics

1	coolant temp	o2 bank1 (right)	o2 bank2 (left)
2	load	injection time	maf
3	maf	throttle angle	timing

Load and Boost

112	egt b1	enrichment b1	egt b2	enrichment b2
113	rpm	load	throttle drive	atmos pressure
114	uncor spec'd load	spec'd load	actual load	boost valve duty
115	rpm	load	spec'd boost	actual boost
118	rpm	iat	boost duty cycle	actual boost

Timing

20: timing correction	1	2	3	4
21: timing correction	5	6
22: correction factor	load	1	2
23: correction factor	load	3	4
24: correction factor	load	5	6
26: knock sensor voltage	1	2	3	4
27: knock sensor voltage	5	6

O2 sensors

30: o2s	ctrl op
31: o2s v pre(s1)/post(s2)	b1s1	b1s2	b2s1	b2s2
32: o2s LTFT pre(s1)	idle b1	part b1	idle b2	part b2
neg no's = ECU subtracting fuel (because too rich)
pos no's = ECU adding fuel (because too lean)
33: o2s STFT pre(s1)	b1 ctrl	b1 v	b2 ctrl	b2 v
34: o2s aging post(s2) b1	rpm	egt	time period	status
35: o2s aging post(s2) b2	rpm	egt	time period	status
36: o2s post(s2)	b1 v supply	b1 status	b2 v supply	b2 status
37: o2s bank1	load	volt s2	corr val s1-s2	status
38: o2s bank2	load	volt s2	corr val s1-s2	status
43: o2s aging pre(s1) b1	rpm	egt	time period	status
44: o2s aging pre(s1) b2	rpm	egt	time period	status

General

4	batt voltage	coolant temp	iat
5	load	speed	Op condition-idl/prt/fl/dcl/erch
6	load	iat	alt cor fact
10	load	throttle drive	ignition time
11	coolant temp	iat	ignition time

Misfires

14	load	misfire count	misfire status
15: misfires	1	2	3	status
16: misfires	4	5	6	status
18: misfires	lowest+speed@	highest+speed@	lowest+load@	highest+load@

Throttle

60: throt	vcm adapt
61: throt	volt	throt drive	op condition
62: throt	sens 1	sens 2	pos	sender 2
63: throt	pos	duty cycle

Secondary air injection system

77: bank 1	air mass	rel air mas	diag
78: bank 2	air mass	rel air mas	diag

Catalytic convertors

46	cat b1
47	cat b2

Misc

50	spec'd eng spd	ac idle boost	ac compressor on/off
54	op condition	throt pos	throt drive
55	idle
56	idle
66	cruise
70	evap
71	fuel tank

References

• http://www.ross-tech.com/vag-com/
• http://www.ross-tech.com/vag-com/m_blocks/
• http://wiki.ross-tech.com/index.php/Audi_A4/S4/RS4_%288D%29
• Mark P's VAGCOM graphing howto