wiring diagram AUDI A4 2000 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual
[x] Cancel search | Manufacturer: AUDI, Model Year: 2000, Model line: A4, Model: AUDI A4 2000 B5 / 1.GPages: 37, PDF Size: 0.15 MB
Page 3 of 37
24-89
If display value does not change:
- Switch ignition OFF and connect VAG 1598/19
test box to ECM harness connector page 01
-
255
.
- Connect VAG 1527B voltage tester between
VAG 1598/19 test box socket C14 and Ground
(GND).
- Switch ignition ON.
- Switch ON rear window defroster.
Voltage tester must light up
If voltage tester does not light up:
If wiring is OK:
If rear window defroster is OK: - Check wiring for continuity between C14 and rear window defroster
using wiring diagram.
- Check rear window defroster using wiring diagram.
- Replace ECM page 01
-265
.
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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 12 of 37
24-94
Engine speed (RPM) signal, checking
Notes:
The RPM signal is routed from the ECM to
various electronic systems (e.g. automatic
transmission, ABS, etc.). The RPM signal is
monitored by the different electronic systems.
Carry out the following check only if the
tachometer (in the instrument cluster) is
inoperative, or if the A/C compressor is not
running.
- Connect VAG 1367 engine-tester to tachometer
using wiring diagram.
- Connect VAG 1367 engine-tester signal wire
(green terminal) to instrument cluster RPM
terminal and A/C control module RPM terminal
(connector remains connected).
- Start engine and let idle.
RPM must be displayed again
If the specified value is obtained, the malfunction
is in instrument cluster or on A/C control module.
If the RPM is not displayed on VAG 1367 engine-
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Page 13 of 37
tester:
- Check wiring between ECM terminal C10 and
instrument cluster or A/C control module using
wiring diagram.
If wiring is OK:
- Replace ECM page 01
-265
.
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Page 16 of 37
24-96
- Switch Fluke 83 multimeter to voltage
measurement range and connect between
signal wire (trip computer 20-pin connector) and
Ground (GND), using wiring diagram.
- Start engine and let idle.
Specified value: approx. 0.3 to 0.6 volts,
corresponding to engine speed (RPM)
- Vary engine speed continuously from 1000 to
4000 RPM.
Specified value: approx. 0.3 to 0.6 volts,
corresponding to engine speed (RPM)
If the specified value is not obtained, even
though the trip computer shows no consumption
value or there is a stored malfunction in the
TCM:
- Stop engine (switch ignition off).
- Replace trip computer and/or TCM as
required.
If the specified value is not obtained:
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Page 17 of 37
If wiring OK and the specified value is not obtained: - Check wiring between ECM terminal C12 and black 20-pin trip
computer connector, using wiring diagram.
- Replace ECM page 01
-265
.
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Page 20 of 37
vehicle speed sensor, using wiring diagram.
If wiring is OK, replace vehicle speed sensor.
If voltage tester does not light up (become brighter) or flash, replace ECM
page 01
-265
. - Find and eliminate open circuit in wiring between terminal C13 and
vehicle speed sensor.
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Page 24 of 37
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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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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