automatic transmission AUDI A6 1998 C5 / 2.G AEB Engine Additional Signal
Page 6 of 29
24-148
Continuation
If the displayed values are NOT OK:
- Connect VAG 1598/22 test box to ECM harness
connector Page 01
-56
.
- Check wiring for open circuit, short circuit to B+
or short circuit to Ground between ECM/test box
terminal 8 and A/C control head -E87-, or
Transmission Control Module (TCM).
Electrical Wiring Diagrams, Troubleshooting &
Component Locations If the wiring is OK:
- Check function of A/C control head -E87-.
Repair Manual, Heating & Air Conditioning,
Repair Group 01
Or:
Repair Manual, 5 Spd. Automatic
Pa
ge 6 of 29 Additional si
gnals
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.24.5
Page 20 of 29
24-156
If the wiring is OK:
- Check multi-function Transmission Range (TR)
program switch -F125-.
Repair Manual, 5 Spd. Automatic
Transmission 01V, Repair Group 01
- Check readiness code Page 01
-59
. If
Diagnostic Trouble Code (DTC) memory has
been erased, or ECM was disconnected,
generate new readiness code Page 01
-62
.
Explanation of 4-digit display
Explanation when display field is = 0
x
x
x
x
(Display group 56)
0 A/C compressor off (0 = A/C compressor off / 1 = A/C compressor on)
0 Selector lever in P or N (0 = selector lever in P or N /1 = selector lever in 2/3/4/R/D)
0 Always "0"
0 Always "0"
Pa
ge 20 of 29 Additional si
gnals
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.24.5
Page 21 of 29
24-157
Timing control during shifting, checking
Notes:
When shifting the automatic transmission, this
signal from the Transmission Control Module
(TCM) retards the ignition timing briefly,
depending on vehicle speed and engine RPM
(reduction of torque), to reduce shift pressure.
Because of the very brief signal to reduce
torque, the signal is not always recognized by
the VAG 1551 scan tool, and therefore is not
always indicated.
Required special tools and test equipment
VAG 1551 or VAG 1552 Scan Tool (ST) with
VAG 1551/3 adapter cable
VAG 1598/22 test box
Pa
ge 21 of 29 Additional si
gnals
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.24.5