battery AUDI A8 1999 D2 / 1.G AHA Engine On Board Diagnostic Workshop Manual

VAG1598/22 test box), or the battery has been
disconnected page 01
-73
.
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01-5
On Board Diagnostic (OBD) technical data

Memory

Temporary memory and permanent memory. If the engine control module is disconnected from the Battery Positive
Voltage (B+) supply, the readiness code and learning values will be erased. Any malfunctions stored in DTC memory are
not erased.
Data output
Rapid data transfer
Additional malfunction indication by Malfunction Indicator Lamp (MIL) lighting up
ECM identification
page 01
-8 ; VAG1551 Scan Tool (ST), connecting and selecting "Engine Electronics" address word 01
ECM functions

The Motronic ECM -J220- performs different OBD functions, carried out with the ignition switched on or with the engine
running. Following are the conditions required to carry out each of the specific functions.
Address words:
Address word 00: Automatic Test Sequence Ignition switched on -or- Engine running at idle
Address word 01: Engine Electronics Ignition switched on -or- Engine running at idle
Address word 33: OBD II (generic scan tool) Ignition switched on -or- Engine running at idle
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Battery Positive Voltage (B+) OK (at least 11
volts)
Engine and transmission GND connections
OK Electrical Wiring Diagrams,
Troubleshooting & Component Locations
binder

Fuel pump relay OK
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01-58

Basic Setting (scan tool function 04)


Notes:

The specified values for the "Basic Setting" and
"Read Measuring Value Block" functions are
described in the respective component test
descriptions.
Disconnecting the battery or the Engine Control
Module (ECM) harness connector will erase all
learned values and the readiness code.
Diagnostic Trouble Code (DTC) memory,
however, will not be erased. After reconnecting
the battery and/or the ECM, the engine may idle
unevenly and there may be some temporary
loss of driveablity. If so, let the engine run at
idle for a few minutes until the learning process
has been completed.
No learning will take place if a malfunction
affecting engine regulation is stored in DTC
memory (this does not include sporadic
malfunctions).
Basic settings are established with the engine
running.
In "Basic Setting" display groups 60 or 98, with
the engine stopped and the ignition switched
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01-67

VAG1598/22 test box, connecting


Notes:

Switch the ignition off and wait at least 10
seconds before disconnecting the Engine
Control Module (ECM) harness connector.
Disconnecting the battery or the Engine Control
Module (ECM) harness connector will erase all
learned values and the readiness code.
Diagnostic Trouble Code (DTC) memory,
however, will not be erased. After reconnecting
the battery and/or the ECM, the engine may idle
unevenly and there may be some temporary
loss of driveablity. If so, let the engine run at
idle for a few minutes until the learning process
has been completed.

- Switch ignition off.

- Disconnect ECM.

- Connect VAG1598/22 adapter cable to ECM
harness connector.

- Generate readiness code page 01
-73
.

Note:
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01-68

Engine Control Module (ECM), replacing


Notes:

Switch the ignition off and wait at least 10
seconds before disconnecting the Engine
Control Module (ECM) harness connector.
Disconnecting the battery or the Engine Control
Module (ECM) harness connector will erase all
learned values and the readiness code. After
reconnecting the battery and/or the ECM, the
engine may idle unevenly and there may be
some temporary loss of driveablity. If so, let the
engine run at idle for a few minutes until the
learning process has been completed page 01
-58
.

After installation of a new ECM, set ECM
coding and carry out adaptation of the throttle
valve control module -J338-.
If the ECM has been replaced, carry out the
following steps in the sequence listed.

- Connect VAG1551/VAG1552 Scan Tool (ST)
and press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (with ignition
switched on) page 01
-8 .
Indicated on display (ECM identification and coding)
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