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Checking vacuum system
- Start engine and let idle for two to three minutes
to build up vacuum.
- Switch ignition OFF.
- Disconnect 2-pin harness connector from intake
manifold change-over valve.
If the vacuum canister returns to its original position, check as follows: - Using jumper wires from connector test kit VW 1594:
- Connect either connector terminal to intake manifold Ground (GND)
point.
- Connect remaining terminal to VAG1348/3A remote control.
- Connect VAG1348/3-2 adapter wire to B+.
- Activate remote for approx. 2 to 3 minutes, during which time vacuum
canister must remain connected.
- Switch ignition OFF.
- Disconnect vacuum lines from intake manifold change-over vacuum
canister.
- Connect US 8026 hand pump to vacuum canister.
- Operate hand pump and note change-over operation.
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- Check vacuum canister for leaks
Vacuum canister should tighten and not
return to its original position until the vacuum
is released at the hand pump
If vacuum canister returns to its original position
(while vacuum is applied):
- Replace intake manifold change-over canister.
If vacuum canister does not tighten, check intake
manifold change-over valve for continuity as
follows:
- Using jumper wires from connector test kit VW
1594:
If no malfunction was found during these checks: - Connect either of valve terminals to intake manifold Ground (GND)
connection.
- Connect remaining terminal to VAG1348/3A remote control.
- Connect VAG1348/3-2 adapter wire to B+.
- Operate VAG1348/3A remote control.
- Check valve for flow (remove vacuum lines and blow through them).
- If necessary, replace intake manifold change-over valve.
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