Carburetor Idle Control System — General Description (Nissan Bluebird T12)

1. This system increases the idle speed by 50-200 rpm whenever the engine load from the power steering pump or alternator increases, thereby maintaining a stable idle speed and ensuring sufficient battery charging.

2. The system is activated by the power steering pressure sensor, the heater fan switch, the electric cooling fan thermal switch and the light switch.

3. The system is controlled by the rotation control unit, which is located on the left side of the driver behind the instrument panel (photo).





4. When one of the switches is triggered, the control unit pulls in the coil-driven valve, which opens the mixture bypass channel.



5. If the idle speed does not increase when the switches are activated, check them as described in the relevant Section of this manual.

Data posted on the website: NISSANBOOK.ru

6. To test the idle speed solenoid valve, disconnect the carburetor wiring and connect 12 volts from the battery to the valve wires. You should be able to hear the valve operate. If faulty, replace it.

7. If a fault is suspected in the control unit, it can only be checked by replacing it with a known good unit (Section 12).