wiring AUDI A4 1999 B5 / 1.G AHA Engine Camshaft Adjustment System Checking Workshop Manual
Page 10 of 12
28-35
Checking voltage supply of valves for
camshaft adjustment
- Disconnect harness connector from valve.
If LED does not light up, conduct the following tests:
Electrical Wiring Diagrams, Troubleshooting & Component Locations
binder - Connect LED tester VAG1527 between engine ground and terminal 1
of connector (B+).
- Crank starter for several seconds (engine can start).
LED in voltage tester must light up.
- Check fuse for valves for camshaft adjustment.
- Check wiring from terminal 1 on 2-pin connector to fuse for continuity
per wiring diagram. - Check fuel pump relay and signal to relay page 24
-95
.
Pa
ge 10 of 12 Camshaft ad
justment s
ystem, checkin
g
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU03.28.2
Page 11 of 12
28-36
Checking signal to valves for camshaft
adjustment
- Disconnect harness connector from valve.
If LED does not flash or stays on continuously:
If LED does not flash: - Connect LED tester VAG1527 between connector terminals 1 and 2.
- Check using output DTM and activate camshaft adjustment page
01
-51
.
LED must flash.
- Connect VAG1598/22 test box to Motronic ECM harness connector (
page 01
-67
) and proceed as follows:
- Check wiring from terminal 2 of connector for valve to terminal 55 of
ECM/test box for continuity and short circuit to B+.
Pa
ge 11 of 12 Camshaft ad
justment s
ystem, checkin
g
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU03.28.2
Page 12 of 12
28-37
If LED stays lit constantly:
If the wiring is OK:
If no malfunction has been found in any of the previous tests:
Repair Manual, 2.8 Liter V6 5V Engine Mechanical, Repair Group 15. - Check wiring between valve connector terminal 2 and ECM/test box
terminal 55 for short circuit to Ground.
Specified value: max. 1 .- Replace Motronic ECM -J220- page 01
-68
.
- Carry out adaptation of throttle valve control module to ECM page
24
-150
.
- Check readiness code page 01
-70
. If Diagnostic Trouble Code
(DTC) memory has been erased, or ECM was disconnected, generate
new readiness code page 01
-73
.
- Replace respective mechanical camshaft adjuster.
Pa
ge 12 of 12 Camshaft ad
justment s
ystem, checkin
g
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU03.28.2