audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

ABOUT US
Coding engine control unit > < Final control diagnosis

A4 Mk1

Motronic injection and ignition system (4-cyl.)
Basic setting
Basic setting

With the ignition on and engine not running, the following operation can be performed in the "Basic setting" mode ("Function 04"):

  • ◆ Adaption of throttle valve control part to engine control unit

With the engine running, the following operations can be performed in the basic setting mode "Function 04":

  • ◆ Learning process for lambda control
  • ◆ Fault-finding by switching lambda control on and off
    => Page 24-61

Test conditions for operations with engine running

  • ● No fault stored in fault memory
  • ● Coolant temperature at least 85 °C
  • ● Electrical consumers switched off (radiator fan must not run during the check)
  • ● Air conditioner switched off
  • ● Gear selector lever in P or N position
  • ● Wheels in straightaway position
  • ‒ Connect vehicle diagnostic, testing and information system VAS 5051 (or fault reader V.A.G 1551) and select engine electronics control unit by entering address word "01" ( => Page 01-3.)
    When doing this the engine must be idling.
  • ‒ Interrogate and erase fault memory
    => Page 01-9.
    There should be no faults stored in the fault memory. (If necessary rectify faults, erase fault memory and switch off engine. Start engine again, take vehicle for a road test and interrogate fault memory again to check.)
  • ‒ Leave engine idling.
 
→ Indicated on display:
Rapid data transfer    HELP
Select function XX
  • ‒ Press keys 0 and 4 for function "Basic setting" and confirm entry by pressing Q.
 
→ Indicated on display:
Basic setting    
Enter display group number XXX
  • ‒ Select the required display group number from the Display Group Overview in the "Read measured value block" section.

Note:

Display Group 000 is used here as an example to illustrate the procedure.

  • ‒ Press key 0 three times.

(000 is to select Display Group 000)

Note:

When the display group is selected the ACF valve is closed and the air conditioner compressor is switched off.
 
→ Indicated on display:
Basic setting    Q
Enter display group number    000
  • ‒ Confirm entry by pressing Q.
 
→ Indicated on display:
System in basic setting 0    ⇒
1    2    3    4    5    6    7    8    9    10

Display Group 000 (decimal readouts)

▪ Engine idling (coolant temperature not below 85 °C)

Display zones

Specification

Corresponds to

1

2

3

4

5

6

7

8

9

10

Lambda learned value at part throttle

102...153

-10...10 %

Lambda learned value with engine idling

76...178

-10...10 %

Lambda control value

115...140

-10...10 %

Learned value of idling speed control

102...153

-5...5 %

Idling speed control

102...153

-5...5 %

Throttle valve angle

1...8

0.4...2.75 %

Battery voltage

142...207

10...14.5

Engine rpm (idling speed) 1)

81...91

810...910 rpm

Engine load (without electrical consumers)

20...34

15...26 %

Coolant temperature (requirement for basic setting)

185...205

85...105 °C

    1)    Up-to-date specifications:

=> Exhaust emissions test binder

  • ‒ Allow engine to idle for a few minutes: coolant temperature at least 85 °C (at least 185 in display zone 1).

Notes:

  • ◆ When the PRINT key is pressed the current display will be printed out.
  • ◆ Press C before selecting further display groups.
  • ‒ If the readouts in all the display zones match the specifications, press the ⇒ key.
 
→ Indicated on display:
Rapid data transfer    HELP
Select function XX
  • ‒ Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
 
→ Indicated on display:
Rapid data transfer    HELP
Select function XX

Coding engine control unit > < Final control diagnosis