Figure 14.29. Elements of the fuel economy system: 1 – headlight switch; 2 – indicator lamp for the need to engage a higher gear; 3 – Excessive throttle opening indicator lamp; 4 – ignition switch; 5 – battery; 6 – idle switch in the throttle position sensor; 7 – 5th gear switch; 8 – vacuum switch; 9 – ignition coil; 10 – to the spark plugs
The elements of the fuel economy system on engines with the RVT system are shown in the figure 14.29. The system provides two
control lamps, one serves as an indicator of the need to engage a higher gear, the other as an indicator of excessive throttle opening.
The upshift indicator lamp comes on when the engine speed exceeds 2800 rpm with the accelerator pedal fully depressed; does not work when 5th gear is engaged or when braking.
The high throttle warning light comes on when the intake manifold pressure falls below 96–140 mmHg and goes off when the pressure exceeds this limit.
To check the operation of the test lamp, connect the tachometer to the engine. Start the engine and check that the warning lamp lights up when the engine's crankshaft speed is 2650-2950 min⁻¹ and remains on as long as the engine's crankshaft speed exceeds this value.
Disconnect the connector from the 5th gear switch on the gearbox and connect the connector contacts together. After this, the control lamp should not light up when the engine crankshaft speed increases.
The text of the article is taken from the website: MAZbook.ru
To check the over-throttle indicator light, disconnect the tube from the vacuum switch and connect a vacuum pump to it. Turn on the ignition; the indicator lamp should come on when the pressure falls below 96–140 mmHg and should go out when the specified pressure is exceeded.