The control lamp in a combination of devices burns at work of glow plugs. After turning off the lamp, the engine can be started. Voltage is supplied to the glow plugs within a few seconds after the control lamp is turned on. If no attempt is made to start the engine after the lamp has been switched off, the timer cuts off power to the glow plugs to avoid draining the battery and overheating the glow plugs.
On models with 1.7L engines, the fuel filter is also equipped with a heating element, which is installed between the filter and the housing and is controlled by the preheating system. The heating element turns on if the temperature of the fuel passing through the filter is less than 5°C and turns off when the temperature of the fuel reaches 16°C.
Examination
Connect a voltmeter between the glow plug supply rail and ground. Turn on the ignition and check that the voltage is supplied to the candles at the appropriate time.
At an air temperature of 20°C, the time intervals for applying voltage to the glow plugs should be 3 seconds, at which the control lamp is lit. The burn time of the warning lamp increases at lower temperatures and decreases as the temperature rises. If voltage is applied to the glow plugs, then the relay and wiring are good.
Using a tester, check the integrity of the glow plugs by checking the resistance between the contact at the top of the plug and the plug body. The glow plug resistance is less than 1 ohm and if the tester shows more resistance, the glow plug is faulty.
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