1996 AUDI A4 check engine

28-1
Technical data, spark plugs Engine code
AEB

Engine idle RPM

Idle RPM cannot be adjusted, is corrected by idle air control 820-900 RPM
RPM limit
Operates by shutting off fuel injectors approx. 6500 RPM
Ignition timing
Ignition timing cannot be adjusted, is monitored by Engine Control Module (ECM)
Firing order 1-3-4-2
Spark plugs Tightening torque 30 Nm (22 ft lb)
Part No.
(Always check with your Parts Department for correct part numbers) 101 000 033 AB (NGK)
101 000 051 AB (BOSCH)

Manufacturer's codes
(if applicable) BKUR 7 ET (NGK)
F6 LTCR (BOSCH)


Electrode gap - mm 0.7 to 0.9 mm

Maintenance interval See Owner's Manual
Spark plug connector resistance
approx. 2 k
Pa
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28-5

Knock sensor and knock sensor
system, checking


Required special tools and test equipment

VAG 1551/1552 Scan Tool (ST) with adapter
cable VAG 1551/3
VAG 1598/22 test box
Multimeter US 1119 (Fluke 83 or equivalent)
VW 1594 connector test kit
Wiring diagrams

Checking

- Connect VAG 1551/1552 Scan Tool (ST) and
press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (engine running at
idle) Page 01
-7 .
Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -8- to select "Read Measuring Value Block"
function 08, and press -Q- button to confirm input.
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28-7
If displayed values are OK:

- Check readiness code Page 01
-59
. If
Diagnostic Trouble Code (DTC) memory has
been erased, or ECM was disconnected,
generate new readiness code Page 01
-62
.

-
Press button to advance program
sequence.
- Press buttons -0- and -6- to select "End Output"
function 06, and press -Q- button to confirm
input.
Evaluating display group 20 Display group: 20
Display fields: 1-4
Possible cause

Correcting action

All cylinders retarded more
than 10 (crankshaft)
Knock sensor faulty- Continuation Page 28
-8

Connector corroded
Knock sensor
incorrectly torqued - Loosen knock sensor and re-tighten to 20 Nm (15 ft lb)
Components loose
on engine - Tighten components
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Poor fuel quality- Change fuel
One cylinder reading is very
different from the others Connector corroded- Continuation Page 28
-8

Engine failure- Check compression Repair Manual, 1.8 Liter 4
-Cyl. 5V
Turbo Engine Mechanical, Engine Code(s): AEB, ATW, Repair Group 15


Components loose
on engine - Tighten components
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plugs
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28-12

Misfiring recognition, checking


Required special tools and test equipment

VAG 1551 or VAG 1552 Scan Tool (ST) with
VAG 1551/3 adapter cable

Checking

- Connect VAG 1551/1552 Scan Tool (ST) and
press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (engine running at
idle) Page 01
-7 .
Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -8- to select "Read Measuring Value Block"
function 08, and press -Q- button to confirm input.
Read Measuring Value Block
HELP
Input displa
y group number XXX

Indicated on display
- Press buttons -0-, -1- and -4- to input display group number 14, and
press -Q- button to confirm input.
Read Measuring Value Block 14 1 2 3 4

Indicated on display (1-4 display groups)
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28-13

- Compare displayed values with specified values
for misfire recognition (display fields 3-4):

Display groups

1 2 3 4
Display group 14: Misfire recognition
Display xxx RPM xx.xx ms xxx activated
deact
Indicates Engine speed
(in 40 RPM steps) Engine load Misfire harmful to emissions (total) Misfire recognition status
Range 0-6800 RPM 0.00-8.50 ms --- ---
Specified value 760-960 RPM 0.5-1.5 ms 20 activated

--- --- If displayed values are NOT OK Page 28
-14

If displayed values are OK:

- Check readiness code Page 01
-59
. If
Diagnostic Trouble Code (DTC) memory has
been erased, or ECM was disconnected,
generate new readiness code Page 01
-62
.

-
Press button to advance program
sequence.
Pa
ge 18 of 22 Technical data, s
park
plugs
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.28.1