engine AUDI A4 1999 B5 / 1.G AWM Engine Readiness Code Workshop Manual

01-78

Readiness code is returned to "0 1 1 0 1 1 0
1" if:

DTC memory was erased,
Voltage supply to ECM was cut off (e.g.
connector disconnected, battery disconnected)
a new Engine Control Module (ECM) was
installed
In this case, readiness code must be re-
generated Page 01
-84
.

Note:
During driving operation in various load
conditions, exhaust relevant tests are performed
by the control module and the readiness code is
generated on its own. In this case, however, the
concluding control possibilities are not available,
meaning that it will not be indicated whether the
vehicle is free of malfunctions upon transfer to
the customer.
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Readiness code, checking


Test sequence

- Connect VAS5051 tester Page 01
-7 and
select vehicle system "01 - Engine electronics".
Engine must run at idle for this.

Display on VAS5051:
- Select diagnostic function "08 - read measured value block" in
selection -1-.

Display on VAS5051:
1 - Enter display group Max. input value = 255
- Select function "086" in button field -2- for "Display group number 086"
and press Q button to confirm input.
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Readiness code, generating


Special Tools and Equipment

Requirements
Important note:
If, during a work step, the test result is indicated as "OK" immediately after
selecting a display group, the test has already been carried out and it is
OK to continue on to the next work step.
VAG1788/10 RPM adjusterVehicle stationary Vehicles with automatic transmission Selector lever in P or N. Electrical consumers switched off (radiator fan must NOT run during
test). A/C switched off. Coolant temperature at least 80 C Display group 004, display
field 3. Important: Drive engine warm via road test if possible.
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Work step 1: Check DTC Memory

Test requirement:

Engine not running, ignition switched on.

- Connect VAS5051 tester Page 01
-7 and
select vehicle system "01 - Engine electronics".
Ignition must remain switched on for this.

Display on VAS5051:
- In selection -1-, click on the diagnostic function "02 - Check DTC
memory".

Display on VAS5051:
1 - DTC memory content:

0 malfunctions recognized
or

X malfunctions recognized
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01-87

Work step 2: Erase DTC Memory

Test requirement:

Engine not running, ignition switched on.

Display on VAS5051:
Note:
When DTC memory is erased, readiness code is reset and must therefore
be re-generated. - In selection -1-, click on the diagnostic function "05 - Check DTC
memory".

Display on VAS5051:
1 - no indication (before erasing)
or

DTC memory erased
2 - Note:Perform the function?Note: Data is being erased !
- Press on "OK" button in display -2-.
-
Click on - button
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Work step 3: Adapt throttle valve control
module to Engine Control Module (ECM)

Test requirement:

Engine not running, ignition switched on.

Display on VAS5051:
- In selection -1-, click on the diagnostic function "04 - Basic setting".

Display on VAS5051:
1 - Enter display group Max. input value = 255
- Select function "060" in button field -2- for "display group number 060"
and press Q button to confirm input.
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01-91

Work step 4: Kick down function, adapting
1)

1) Only vehicles with automatic transmission

Test requirement:

Engine not running, ignition switched on.

Display on VAS5051:
Note:
There will be a prompt: "Operate kick down".
Note:
During adaptation of the kick down point, "Kick down ADP in progress" will
be indicated in display. After successful adaptation of the kick down point,
"Kick down ADP OK" will be indicated on display. -
Press button 3 times to change into display group 063.- Depress accelerator pedal completely, past kick down point, and hold
down.
- Check specified value in display field -4-.
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Work step 5: Check operating condition of
oxygen sensor control

- Start engine (for a vehicle with manual
transmission: engage clutch).

Note:
If necessary, vehicle system "01 - engine
electronics" and diagnostic function "04 -basic
setting" must be selected again after engine
start.

- Install VAG1788/10 RPM adjuster on the
accelerator pedal and raise the engine speed to
2600 RPM.

Test requirement:

Engine running at 2600 RPM.

Display on VAS5051:
-
Click on - button
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Display fields

1 2 3 4
Display group 030: Oxygen sensor status
Display
X X X
X X X


Indicated
Oxygen sensor status, bank 1, sensor 1
Oxygen sensor status, bank 2, sensor 1


Functional range
0 = off
1 = on 0 = off
1 = on

Specified value
1 1 1
1 1 0

Significance of 3 digit indications in display group 030 X
X
X
Display fields 1 and 2
X Oxygen sensor control: 0= not active; 1 = active
X Operational readiness of oxygen sensor: 0= not active; 1 = active
X Condition of oxygen sensor heater: 0= not active; 1 = active
Notes:

The first position of the 3 digit indication (heating) fluctuates between 0 and 1 at certain operation points.
Oxygen sensor control of oxygen sensor behind catalytic converter (bank 1, sensor 2) is not active without engine load,
meaning that the third position of the 3-digit display is 0.

-
Do not start test until indication in display field 1
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Work step 6: Diagnostic of oxygen sensor
aging before catalytic converter

Test requirement:

Engine continues to run at 2600 RPM.

Display on VAS5051:
Note:
A few minutes may pass until a diagnostic result is reached. -
Press button 4 times to change into display group 034.- Check specified value in display field -4-.
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