manual transmission AUDI A4 2000 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual

24-92
If the specified values are obtained:

-
Press button.
- Select "End Output" function 06.

- Press -Q- button to confirm input.
If display value changes:

- The following display is possible: "A/C system
not switched on as described."
If the display value does not change, even
though the A/C system was switched on as
described:

If wiring is OK:
Repair Manual, Heating & Air Conditioning, Repair Group 01; connect VAG 1551 scan tool and select "Check DTC Memory" function 02

Repair Manual, 5 Spd. Automatic Transmission 01V, Repair Group 01;
connect VAG 1551 scan tool and select "Check DTC Memory" function 02
- Check wiring for continuity between connector terminal C11 and ECM
or TCM using wiring diagram.
- Check A/C system or automatic transmission:
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24-93
If X1X_XX is displayed:

- Briefly press accelerator pedal to apply wide
open throttle.

Display must switch briefly to X0X_XX, then
X1X_XX must appear again after several
seconds.
If display does not change as described:

- Check whether A/C compressor was shut off
while accelerator pedal was being pressed.

- Check A/C system or automatic transmission.

Repair Manual, Heating & Air Conditioning,
Repair Group 01; connect VAG 1551 scan tool and select "Check DTC Memory" function 02


Repair Manual, 5 Spd. Automatic
Transmission 01V, Repair Group 01
; connect
VAG 1551 scan tool and select "Check DTC
Memory" function 02
If the display does not change as described:
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24-95

Fuel consumption signal, checking


Notes:

The consumption signal is internally calculated
by the ECM using "injection time."
The consumption signal is routed to both the
trip computer and the Transmission Control
Module (TCM).
The consumption signal is monitored by the
TCM

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

Carry out the following check only if DTC
memory contains a stored DTC for the TCM
related to the consumption signal, or a missing or
false consumption signal, determined during the
trip computer check.

- Remove instrument cluster or TCM.

Repair Manual, Electrical Equipment, Repair
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Group 90; Instrument cluster, repairing


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


- Connect VAG 1598 test box to instrument
cluster harness connector (I/P insert not
connected) or to TCM harness connector (TCM
not connected).

Repair Manual, Electrical Equipment, Repair
Group 90; Instrument cluster, repairing


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

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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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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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