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Motronic system, On Board Diagnostic (OBD)
Page 1 of 183
01-1
Motronic system, On Board
Diagnostic (OBD)
On Board Diagnostic, technical data
Equipment
The advantages of OBD can only be fully
exploited by using the vehicle diagnostic, testing
and information system VAS5051 or the
VAG1551 scan tool, in operating mode 1 "Rapid
data transfer."
The DTC memory is equipped with a permanent
memory and therefore does not depend on the
voltage (power) supply.
The stored malfunctions will be displayed after
checking the Diagnostic Trouble Code (DTC)
memory
Page 01-14 .
After eliminating malfunctions the DTC memory
must be erased
Page 01-14 .
Note:
Every time the DTC memory is erased and the
voltage supply to the Motronic Engine Control
Module (ECM) -J220- has been interrupted a
new readiness code must be generated
Page 01-116 .
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Motronic system, On Board Diagnostic (OBD)
Page 2 of 183
The Exhaust Malfunction Indicator Light (MIL) in
the instrument cluster will be switched on if the
ECM recognizes malfunctions that have an
effect (decrease emission values) on exhaust
emissions
Page 01-2 .
Malfunctions relating to the electronic throttle
are also indicated by the Electronic Power
Control (EPC) warning light in the instrument
cluster.
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1/17/2006
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Motronic system, On Board Diagnostic (OBD)
Page 3 of 183
01-2
Exhaust Malfunction Indicator Light
(MIL), significance
If the Engine Control Module (ECM) recognizes
emission related malfunctions, this is indicates by
the MIL coming on.
MIL in instrument cluster
Note:
When a recognized malfunction switches on the MIL, it will either blink or
light continuously. In either case, the DTC memory must be checked
Page 01-14 .
Blinking MIL: If the MIL starts to blink, there is a malfunction that can
lead to damage of the Three Way Catalytic Converter (TWC). In this
case driving should only continue with reduced power until the MIL
goes out or stays on continuously.
If the MIL lights continuously, there is malfunction that affects exhaust
emissions. In this case the DTC memory of the ECM and
Transmission Control Module (TCM) (if equipped) must be checked.
Some malfunctions may occur without causing the MIL to come on.
When driveability or performance problems are reported and there is
no indication from the MIL, the operation of the MIL must be checked.
In addition, the DTC memory of the ECM and TCM must be checked,
as there may be malfunctions stored that do not switch the MIL on
immediately.
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1/17/2006
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Motronic system, On Board Diagnostic (OBD)
Page 4 of 183
01-3
Checking function
- Switch ignition on.
MIL must light up
If the MIL does not light up with ignition switched
on:
Cause:
Corrective action:
MIL is not
activated or does
not light up
because of an
open circuit.
- Switch ignition off.
- Connect VAG1598/31 test
box
Page 24-20
- Bridge sockets 2 and 47 on
test box
- Switch ignition on.
MIL must light up.
If the MIL does not light up:
- Switch ignition off.
- Check whether lamp is
burned out and test voltage
supply to lamp wiring
diagram.
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Motronic system, On Board Diagnostic (OBD)
Page 5 of 183
If the lamp and the voltage
supply are OK:
- Check for open circuit or
short circuit in wiring
between engine control
module and MIL using wiring
diagram. Determine and
eliminate malfunction.
If there are no malfunctions in
the wiring to the MIL:
Malfunction
cause:
Engine control module (ECM)
faulty Replace Engine
Control Module (ECM)
Page 24-24 .
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1/17/2006
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