Audi A8 1994, Руководство по обслуживанию

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Display zones
1 2 3 4
Display Group 2: Intake air mass at idling speed with engine at normal operating temperature
Display xxx rpm xx.x % x.x ms xxx.x g/s
Indicates Engine speed
(in steps of 40 rpm)
Load Meaninjection period Air mass
Range min.: 550 rpm
max.: 6800 rpm
min.: 0 %
max.: 100 %
min.: 1.0 ms
max.: 20.0 ms
min.: 3.0 g/s
max.: approx. 150 g/s
Specification 650...750 rpm 12.0....26.0 % 1.0....4.0 ms 3.0....5.0 g/s
Note --- --- If readout does not match
specification, see table for
display zone 3 => Page
46
If readout does not match
specification, see table for
display zone 4 => Page
46
If the specification is obtained:
- Press ⇒key.
- Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
- Switch off the ignition.
Reading Display Group 2
Display zone 3 Possible cause of fault Fault remedy
Less than 1.0 ms - Lower values can only occur when vehicle is
on overrun
More than 4.0 ms - Load on engine due to ancillaries - Eliminate load (air conditioner, power steer‐
ing, alternator)
- Rough idling (engine not running on all cyl‐
inders)
- Test spark plugs
Test injectors => Page 36
- Throttle valve control part -J338 defective - Test throttle valve control part
=> Page 76
Reading Display Group 2
Display zone 4 Possible cause of fault Fault remedy
Less than 3.0 g/s - Large quantity of unmetered air between in‐
take manifold and air mass meter
- Voltage supply to air mass meter or wiring
to
- engine control unit
- Check intake system for leaks
(unmetered air) => Page 46
More than 5.0 g/s - Load on engine due to ancillaries - Eliminate load (air conditioner, power steer‐
ing, alternator)
- Voltage supply to air mass meter or wiring
to
- engine control unit
- Test voltage supply and wiring
=> Page 46
Testing power supply to air mass meter
Audi A8 1994 ➤
Motronic injection and ignition system (6-cylinder) - Edition 02.1999
46
24 - Mixture preparation, Injection