AUDI A4 1999 B5 / 1.G AFC Engine Intake Manifold Over Valve Checking Workshop Manual
Page 1 of 4
24-64
Intake manifold change-over
valve, checking
Component locations page 24
-1 .
- Disconnect intake manifold change-over valve
harness connector.
If the specified value is not obtained: -
Switch multimeter (Fluke 83 or equivalent) to measure resistance ( )
and connect between terminals on valve.
Specified value: 25 to 35 ohms ( )- Replace intake manifold change-over valve.
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Page 2 of 4
24-65
Checking voltage supply
If voltage tester does not light up: - Disconnect intake manifold change-over valve harness connector.
- Connect VAG 1527B voltage tester between harness connector
terminal 1 and 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 intake manifold change-over valve.
- Check wiring for continuity between intake manifold change-over valve
harness connector terminal 1 and fuse, using wiring diagram.
Specified value: max. 1.0 - Check fuel pump relay and triggering page 24
-24
.
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ge-over valve, checkin
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Page 3 of 4
24-66
Checking triggering
If voltage tester does not flash, or lights up constantly:
If voltage tester lights constantly:
If voltage tester does not flash: - Connect VAG 1527B voltage tester between intake manifold change-
over valve connector terminal 1 (B+) and 2 using jumper wires from
connector test kit VW 1594.
- Use scan tool "Output Diagnostic Test Mode" function 03 to trigger
Intake manifold change-over valve page 01
-145
.
Voltage tester must flash
- Connect VAG 1598/19 test box to ECM page 01
-255
.
- Check wiring from intake manifold change-over valve connector
terminal 2 to test box socket B4 to Ground (GND).
- Check wiring for continuity between terminal 2 of intake manifold
change-over valve connector and socket B4 of test box.
Specified value: max. 1.0
If wiring is OK: - If necessary eliminate break in wiring or short to Ground.
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Page 4 of 4
- Replace ECM page 01
-265
.
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ge-over valve, checkin
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