lock AUDI A4 1997 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual
[x] Cancel search | Manufacturer: AUDI, Model Year: 1997, Model line: A4, Model: AUDI A4 1997 B5 / 1.GPages: 37, PDF Size: 0.15 MB
Page 1 of 37

24-88
Auxiliary input signals,
checking
Rear window defroster signal, checking
Requirement
Engine Control Module (ECM) coding OK
page 01
-247
.
Checking
- Using VAG 1551 scan tool, select "Read
Measuring Value Block" function 08, display
group 004, display field 4 page 01
-249
.
Read measuring value block 4 1 2 3 4
Indicated on display, note value in display field 4
CAUTION!
Do not use the shift inputs (identified by an X) during the RPM
increase check.
If display value is OK: Specified value: 0XX_XX
- Switch ON rear window defroster.
Specified value: 1XX_XX
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Page 6 of 37

24-91
Checking
- Start engine and let idle.
- Switch A/C on, push "AUTO" button, set
temperature to "LO" and blower speed to "HI".
A/C compressor symbol must light up and
A/C must run.
- Using VAG 1551 scan tool, select "Basic
Setting" function 04, display group 004 page 01
-150
.
A/C compressor must stop (visual check)
If the A/C compressor does not shut off:
- Switch A/C off (press "minus" button for fresh air
blower in A/C control head repeatedly, until all
indicators are off).
Continue to let engine run in idle.
- Using VAG 1551 scan tool, select "Read
Measuring Value Block" function 08, display
group 004.
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Page 7 of 37

Read measuring value block 4 1 2 3 4
Indicated on display; note value in display field 4
CAUTION!
Do not use the shift inputs (identified by an X) during the RPM
increase check.
- Switch on A/C as described.
Specified value: X1X_XX
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Page 18 of 37

24-97
Vehicle speed signal, checking
Note:
The vehicle speed signal originates from the
vehicle speed sensor (on the transmission) and
is routed to the instrument cluster as well as to
the Engine Control Module (ECM).
Speedometer in instrument cluster OK
Checking
- Using VAG 1551 scan tool, select "Read
Measuring Value Block" function 08, display
group 003 page 01
-249
.
Read measuring value block 3 1 2 3 4
Indicated on display
- Observe display field 4 while accelerating from standstill.
Specified values:
0 mph (at standstill)
Actual speed (vehicle driven)
-
Press button.
- Select "End Output" function 06.
- Press -Q- button to confirm input.
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Page 21 of 37

24-99
Transmission Range (TR) selector lever
position signal, checking
Note:
The Engine Control Module (ECM) uses this
signal to recognize the transmission range
selector lever position. When a driving mode is
selected, idle speed should drop by approx. 50
RPM to reduce creep.
Checking requirement
Control module coding OK page 01
-247
.
- Switch ignition ON.
- Using VAG 1551 scan tool, select "Read
Measuring Value Block" function 08, display
group 004, display field 4 page 01
-249
.
Read measuring value block 4 1 2 3 4
Indicated on display
CAUTION! Specified value: XXX_1X (TR selector lever in P or N)
- Apply brake and select drive mode (1, 2, 3, R or D).
Specified value: XXX_0X
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Page 23 of 37

24-100
-
Press button.
- Select "End Output" function 06 and press -Q-
button to confirm input.
If a display did NOT change, even though coding
is OK:
- Connect VAG 1598/19 test box to ECM harness
connector page 01
-255
.
- Connect VAG 1527B voltage tester between test
box sockets 11B (signal) and 10B (constant
B+/terminal 30).
Voltage tester must light up (with TR selector
lever in P or N), then go out with drive mode
(1, 2, 3, R or D) selected
If voltage tester lights up and goes out when
drive mode is selected, even though the range
indicator in the "Read measuring value block" is
OK:
- Replace ECM page 01
-265
.
If voltage tester lights up constantly or not at all:
-
Check wiring for short to ground, short to B+ or open circuit between
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Page 26 of 37

- Test drive and select "Read Measuring Value
Block" function 08, display group 004 page
01
-249
.
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Page 27 of 37

24-102
Read measuring value block 4 1 2 3 4
Indicated on display; note display field 4
Notes:
Due to its short signal duration, shifting cannot always be observed on the
VAG 1551 scan tool.
CAUTION!
Do not use the shift inputs (identified by an X) during the shift signal
check.
If the change in the shift signal display did not occur, even though the
control module coding was OK: Specified value: XXX_X0
Shift value must increase briefly during shifting.
Specified value: XXX_X1
-
Press button.
- Select "End Output" function 06.
- Press -Q- button to confirm input.
- Connect VAG 1598/19 test box to ECM harness connector page 01
-
255
.
- Check wiring for open or short circuit between ECM and TCM, using
wiring diagram.
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Page 31 of 37

24-106
- Switch ignition ON.
- Using VAG 1551 scan tool, select "Read
Measuring Value Block" function 08, display
group 027, display field 1 page 01
-249
.
Read measuring value block 27 1 2 3 4
Indicated on display; note display field 1
If the specified value is not obtained, even though coding is OK: Specified value: 0
- Start engine and let idle.
Specified value: 1
-
Press button.- Select "End Output" function 06.
- Press -Q- button to confirm input.
- Connect VAG 1598/19 test box to ECM harness connector page 01
-
255
.
- Check wiring for open or short circuit between ECM and TCM, using
wiring diagram.
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Page 33 of 37

24-108
- Switch ignition ON.
- Using VAG 1551 scan tool, select "Read
Measuring Value Block" function 08, display
group 027, display field 2 page 01
-249
.
Read measuring value block 27 1 2 3 4
Indicated on display; note display field 2
If the specified value is not obtained, even though coding is OK: Specified value: 0
- Start engine and let idle.
Specified value: 1
-
Press button.- Select "End Output" function 06.
- Press -Q- button to confirm input.
- Connect VAG 1598/19 test box to ECM harness connector page 01
-
255
.
- Check wiring for open or short circuit between ECM and instrument
cluster, using wiring diagram.
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