air condition AUDI A4 1998 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual
Page 8 of 37
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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Page 10 of 37
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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Page 34 of 37
24-109
Rough road condition signal, checking
ABS control module with ABS/EDL
Notes:
Misfires can result in malfunctions such as
"Combustion misfire" being recorded in DTC
memory due to road wheel malfunctions.
If the ABS control module recognizes a free
turning wheel, it generates a rough road signal.
If the Engine Control Module (ECM) recognizes
the rough road signal, misfire recognition is
switched off in the ECM.
The rough road signal is created to check
whether DTC 18014 "Rough Road Spec Engine
Torque ABS-SG Electrical Malfunction" is
stored in DTC memory. The "Combustion
misfire" malfunction results from this signal and
can be ignored.
The rough road signal is monitored by the
ECM.
Checking requirement
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