AUDI A4 1998 B5 / 1.G AFC Engine Exhaust Gas Recirculation Checking Workshop Manual

24-67


Exhaust Gas Recirculation
(EGR) vacuum regulator
solenoid valve, checking

Note:
For a functional check of the EGR system
Repair Group 01, Read measuring value block,
display group 001.
- Disconnect EGR vacuum regulator solenoid
valve harness connector.

If the specified value is not obtained: -
Switch multimeter (Fluke 83 or equivalent) to measure resistance ( )
and connect between valve terminals.
Specified value: 25 to 35 - Replace EGR vacuum regulator solenoid valve.
Pa
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(EGR
) vacuum re
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11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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pair&id=AUDI.B5.FU01.24.18

24-68

Checking voltage supply

- Disconnect EGR vacuum regulator solenoid
valve harness connector.

If voltage tester does not light up: - Connect VAG 1527B voltage tester between connector terminal 1 (B+)
and engine Ground (GND) using jumper wires from connector test kit
VW 1594.
- Use scan tool "Output Diagnostic Test Mode" function 03 to trigger fuel
pump relay -J17- page 01
-145
.
Voltage tester must light up
- Check fuse for EGR vacuum regulator solenoid valve.

- Check wiring for continuity between EGR vacuum regulator solenoid
valve connector terminal 1 and fuse, using wiring diagram.

Specified value: max. 1.0 ohm ( )- Check fuel pump relay and triggering page 24
-24
.
Pa
ge 2 of 4 Exhaust Gas Recirculation
(EGR
) vacuum re
gulator solenoid valve, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.24.18

24-69

Checking triggering

If voltage tester does not flash, or lights up constantly:
If voltage tester lights up constantly:
If voltage tester does not flash: - Connect VAG 1527B voltage tester between EGR vacuum regulator
solenoid valve connector terminals 1 (B+) and 2 using jumper wires
from connector test kit VW 1594.
- Use scan tool "Output Diagnostic Test Mode" function 03 to trigger
EGR vacuum regulator solenoid valve page 01
-145
.
Voltage tester must flash
- Connect VAG 1598/19 test box to ECM wiring harness page 01
-
255
.
- Check wiring for short to Ground (GND) between valve connector
terminal 2 and test box socket E1.
- Check wiring for continuity and short to B+ between valve connector
terminal 2 and test box socket E1.

Specified value: max. 1.0 ohm ( )

If wiring is OK: - If necessary, eliminate short or open circuit in wiring.
Pa
ge 3 of 4 Exhaust Gas Recirculation
(EGR
) vacuum re
gulator solenoid valve, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.24.18

- Replace ECM page 01
-265
.
Pa
ge 4 of 4 Exhaust Gas Recirculation
(EGR
) vacuum re
gulator solenoid valve, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.24.18