AUDI A8 1998 D2 / 1.G AEB Engine EVAP System Checking

24-143

Checking EVAP canister purge regulator
valve voltage supply

Test conditions

Fuse for EVAP canister purge regulator
valve OK.

- Disconnect harness connector from EVAP
canister purge regulator valve.

If LED test light does not light:
If wiring is OK: - Connect VAG 1527B LED voltage tester between connector terminal 1
and engine Ground.
- Operate starter motor.
Specified value: LED must light up
- Check wiring for open circuit between connector terminal 1 and fuse,
according to wiring diagram. Repair if necessary.
- Check fuel pump relay Page 24
-81
.
Pa
ge 11 of 12 Eva
porative Emissions
(EVAP
) system, checkin
g
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.24.4

24-144

Checking signal to EVAP canister purge
regulator valve

If LED test light does not blink, or stays on: - Connect VAG 1527B LED voltage tester between connector terminals
1 (B+) and 2.
- Start output Diagnostic Test Mode (DTM) for EVAP canister purge
regulator valve -N80 - Page 01
-42
.
LED must blink
- Connect VAG 1598/22 test box to ECM harness connector Page 01
-
56
.

If wiring is OK: - Check wiring for open circuit or short circuit to B+ between connector
terminal 2 and Motronic ECM terminal 15.
- Replace Motronic ECM -J220- Page 01
-57
.
- Carry out adaptation of throttle valve control module to ECM Page
24
-119
.
- 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
.
Pa
ge 12 of 12 Eva
porative Emissions
(EVAP
) system, checkin
g
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.24.4