On-Board Diagnosis System II - Volkswagen Technical Site

Overview of OBD-II (Gasoline Engine)
The display on the diagnosis system in OBD II Scan Tool Mode
This display appears after you enter "1" (for rapid data transfer) followed by "33" (for activate Scan Tool
function).
OBD II Scan Tool
Select Mode
1.. 2.. 3.. 4.. 5.. 6.. 7.. 8..
For example, the following display appears after you select Mode 1.
This display contains various display fields which display the diagnosis data.
From here, you can select the various PIDs (e.g. PID 5 = engine temperature, PID 16 = air mass flow rate).
Mode display
7 modes are
selectable
(41 - 47)
e.g. 41
= Diagnosis data
transmitted
Parameter
identification
PID1
= Fault code
P0xxx/P1xxx
Name of module
Module 10
= Motronic control unit
Module 1a
= Transmission control unit
Mode 41 PID1 Module 10
00000000
000001 1 1
01101101
00000000
Display field 1
Number of stored
faults;
self-diagnosis fault
warning lamp (MIL)
On/Off
Display field 2
ongoing diagnosis
(e.g. misfiring
recognition)
Display field 3
Displays whether
components are
supported by the
diagnosis.
Display field 4
Indicates whether the Readiness
Code was set.
The readiness display "00000000" only indicates that all individual diagnosis affecting
exhaust emissions were conducted in accordance with regulations. A "0" is set to denote a completed
individual diagnosis even if a fault was detected and stored.
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