AUDI A4 2000 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Owner's Manual

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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Do not use the shift inputs (identified by an X) during the selector
lever position check.
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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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If wiring is OK:
Repair Manual, 5 Spd. Automatic Transmission 01V, Repair Group 01; Electrical test.
ECM terminal 11B and multi-function switch, using wiring diagram.
- Check multi-function switch.
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24-101

Shift procedure, checking


Notes:

The Engine Control Module (ECM) uses this
signal to briefly retard the ignition during shifting
to reduce the mechanical jerking felt between
shifts.
The shift signal is monitored by the
Transmission Control Module (TCM).

Repair Manual, 5 Spd. Automatic
Transmission 01V, Repair Group 01; On Board Diagnostic

Carry out the following check only if a shift-
related DTC is stored in the TCM DTC memory.

Checking requirement

Control module coding OK page 01
-247


CAUTION!

Always use a second technician to operate
the VAG 1551 scan tool while driving.

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- Test drive and select "Read Measuring Value
Block" function 08, display group 004 page
01
-249
.
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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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24-103

Upshift and downshift signals, checking


Notes:

The Engine Control Module (ECM) uses this
signal in connection with the shift signal to
determine whether the current signal is an
upshift or downshift.
The signal for upshift and downshift is
monitored by the Transmission Control Module
(TCM).

Repair Manual, 5 Spd. Automatic
Transmission 01V, Repair Group 01; On Board Diagnostic


Checking requirement

Control module coding OK page 01
-247
.
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24-104

Throttle position sensor output signal,
checking


Notes:

The Transmission Control Module (TCM)
interprets this information as a load signal.
This signal is monitored by the TCM.

Repair Manual, 5 Spd. Automatic
Transmission 01V, Repair Group 01; On Board Diagnostic


Checking requirement

Control module coding OK page 01
-247
.
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24-105

Malfunction Indicator Lamp (MIL) wire
from Transmission Control Module
(TCM), checking


Notes:

If a malfunction is recognized by the Engine
Control Module (ECM) or the Transmission
Control Module (TCM), it is indicated by the
Malfunction Indicator Lamp (MIL) in the
instrument cluster.
If the TCM recognizes a malfunction, the MIL is
switched on via the ECM.
The MIL wiring is monitored by the ECM.

Checking requirement
Control module coding OK page 01
-247
.
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