1. Engines AGP, AQM
1. Disconnect the wiring connector (arrow) from intake manifold changeover valve (pic. 7.65).
2. Measure the resistance between the valve contacts (pic. 7.66). Specification resistance: 25.0-45.0 ohm.
3. If the specified value is not reached, replace the connecting pipe of the air duct with the intake manifold changeover valve.
4. If the specified value is reached, connect to pins 1 and 2 of the wiring connector and measure the voltage (pic. 7.67). Start the engine and leave it to idle. Specification value: at least 4.5 V.
5. Turn off the ignition. The voltage value should drop to 0V in about 3 seconds.
6. If the voltage does not change as required, connect the VAG 1598/22 tester to the engine control unit wiring harness (rice. 7.38).
7. Check the wire between the tester and the connector for an open circuit: pin 1 and slot 2, pin 1 and slot 28. pin 2 and slot 15 (pic. 7.67). Set value: 1.5 ohm.
8. Additionally, check the wires for shorting one to the other, to «mass» vehicle and to the positive pole of the battery. Specification resistance: ∞ Ohm.
9. If no fault is found in the wires, replace the engine control unit.
2. Engines AGR, ALH, ASV
1. Disconnect the wiring connector (arrow) from intake manifold changeover valve (pic. 7.68).
2. Measure the resistance between valve contacts (pic. 7.69). Specification resistance: 25.0-45.0 ohm.
3. If the specified value is not achieved, replace the intake manifold changeover valve.
4. If the specified value is reached, connect to pins 1 and 2 of the wiring connector and measure the voltage (pic. 7.70). Start the engine and leave it to idle. Specification value: at least 4.5 V.
5. Turn off the ignition. The voltage value should drop to 0V in about 3 seconds.
6. If the voltage does not change as required, connect the VAG 1598/22 tester to the engine control unit wiring harness (rice. 7.38).
7. Check the wire between the tester and the connector for an open circuit: pin 1 and socket 2, pin 1 and socket 28, pin 2 and socket 3 (pic. 7.70). Set value: 1.5 ohm.
8. Additionally, check the wires for shorting one to the other, to «mass» vehicle and to the positive pole of the battery. Specification resistance: ∞ Ohm.
9. If no fault is found in the wires, replace the engine control unit.
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