Intake manifold change-over This test should only be performed if there is a performance deficiency. The intake manifold switches from the long intake path to the short one at approx. 4700 RPM.
Intake manifold change-over function, checking - Increase engine RPM significantly above 4700 RPM. This process should actuate the vacuum diaphragm for the intake manifold change-over. (Component location: on intake manifold front left, beneath ignition coils). If the change-over does not occur, the following tests must be performed. - Check Intake Manifold Change-Over Valve N156- Page 01-56 ,if necessary, check activation valve Page 24-71 or page Page 24-74 ). - Check vacuum system for proper seal 24-68 .
Page
- Check vacuum lines for proper connection, sealing and continuity.
- Let vehicle run at idle for 2 to 3 minutes (vacuum build-up). - Switch ignition off. - Disconnect connector from Intake Manifold Change-Over Valve -N156-. - Connect one terminal of solenoid valve to engine Ground (GND) using an adapter cable and an alligator clip from VAG1594A connector test kit. - Connect the second terminal of solenoid valve to B+ using VAG1348/3A remote control, VAG1348/3-2 adapter cable and assisting cable. - Operate VAG1348/3A remote control for approx. 2 to 3 minutes, vacuum diaphragm must remain activated during this time. If the vacuum diaphragm moves back, check vacuum reservoir as follows: - Disconnect vacuum hoses from vacuum reservoir for intake manifold change-over. - Connect VAG1390 hand vacuum pump to vacuum reservoir. - Operate hand vacuum pump and observe change-over procedure.
- Check vacuum reservoir for proper seal. (Vacuum reservoir must not return to rest position, as long as the hand vacuum pump is not vented.) - Replace vacuum reservoir if necessary. - If the vacuum diaphragm does not activate, check Intake Manifold Change-Over Valve N156- for continuity as follows: - Connect one terminal of Intake Manifold Change-Over Valve -N156- to engine Ground (GND) using an adapter cable and an alligator clip from VAG1594A connector test kit. - Connect the second terminal of Intake Manifold Change-Over Valve N156- to B+ using VAG1348/3A remote control, VAG1348/3-2 adapter cable and assisting cable. - Operate VAG1348/3A remote control. - Check valve for throughput (disconnect vacuum hose and blow through). - If necessary, replace intake manifold change-over valve. - Check vacuum system for leaks if no malfunctions were detected for all previous tests.
Intake manifold change-over valve -N156-, checking Special Tools and Equipment VAG1526A VAG1527B VAG1594A VAG1598/31 VAS5051 with VAG5051/1 - or VAG1551 with VAG1551/3B
Component location Overview of component locations, page Page 24-5 Test requirement: Output Diagnostic Test Mode (DTM) performed Fuse for intake manifold change-over valve is OK
Checking internal resistance - Disconnect connector from Intake Manifold Change-Over Valve -N156-. - Connect multimeter at valve for resistance measurement. Specification: 25 to 35 - Replace Intake Manifold Change-Over Valve -N156- if specified value is not obtained.
Checking voltage supply - Disconnect connector from Intake Manifold Change-Over Valve -N156-. - Connect VAG1527B voltage tester as follows: Harness connector
Measure to
Terminal 1
Engine Ground (GND)
- Operate starter briefly. LED must light up. If LED does not light up: - Check wire connection from terminal 1 to Fuel Pump (FP) relay via fuse for open circuit. Electrical Wiring Diagrams, Troubleshooting & Component Locations binder
Checking activation - Connect VAG1527B voltage tester between terminals 1 and 2 - Initiate output Diagnostic Test Mode intake manifold change-over valve.
Page 01-56 and activate the
LED must blink. If LED does not blink or if it remains constantly lit: - Connect VAG1598/31 test box at wiring harness to ECM, do not connect ECM Page 24-17 . - Check the following wire connection for open circuit and short circuit to Ground (GND) and B+: Harness connector VAG1598/31 test box Terminal 2
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