A device for testing electronic ignition systems of domestic cars. Scheme, description

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A device for testing electronic ignition systems of domestic cars. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Automobile. Ignition

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The proposed simple device allows you to quickly find the faulty node of the electronic ignition system. Its scheme is shown in the figure. The device consists of a pulse generator assembled on the DD1 chip and the VT1 transistor to start the electronic switch of the ignition system and the HL1 LED, which serves as an indicator of the pulses generated by the Hall sensor installed in the ignition distributor. The operating mode of the device is selected by switch SA1: D - sensor check; K - check of the electronic switch; R - work.

The socket XS1, brought out of the device with a bundle of three wires 0,5 m long, is connected to the plug on the ignition distributor, disconnecting from it the socket that terminates the wiring harness coming from the electronic switch. The socket disconnected from the ignition distributor is connected to the XP1 plug of the device. Pin 1 should be connected to the white-black wire of the harness, pin 2 - green, pin 3 - magenta.

Rice. Scheme of a device for testing electronic ignition systems (click to enlarge)

From the ignition distributor, remove the central high-voltage wire coming from the ignition coil and connect it to the central electrode of the control spark plug. It can be any serviceable candle, including a used one. Connect its body to the body of the car. To do this, you can use a large crocodile clip.

Switch SA1 set to position P. Turn on the ignition, and crank the engine with a starter, observing sparks in the gap of the control candle. If they are present and follow without gaps, then the ignition system is working. Otherwise, it has a malfunction.

Move switch SA1 to position K. With the ignition on, turn the engine with a starter while simultaneously turning the knob of the variable resistor R3 "Turns". In all positions of the variable resistor, white sparks should regularly jump in the gap of the control candle. If there are no sparks, they follow with gaps or disappear in some positions of the variable resistor engine, then the electronic switch is faulty and must be replaced.

If it is serviceable, move switch SA1 to position D and, without turning off the ignition, turn the engine with a starter. If the HL1 LED flashes brightly periodically, then the Hall sensor is working. Otherwise, it must be replaced.

To check if the ignition distributor slider is broken, set switch SA1 to position K. Remove the distributor cover and with a 50 cm long piece of high-voltage wire with small alligator connectors at both ends, connect the slider contact to the central electrode of the control candle, to which the wire is already connected from the ignition coil.

Crank the engine with the starter with the ignition on, and at the same time turn the knob of the variable resistor R3. In all positions of the variable resistor, white sparks should regularly jump in the gap of the control candle. If they are not there or they follow with gaps or disappear in any position of the variable resistor engine, then the slider should be replaced.

Before checking the serviceability of the ignition distributor cap, set the switch to position K. With the ignition off, slowly turn the engine crankshaft to such a position that the slider is exactly in the middle between any adjacent contacts of the cover leading to the candles in the cylinders. Put the cover on the distributor and alternately insert the high-voltage wire (which connected the slider to the control candle) into each of the five slots in the cover, each time turning on the ignition. The control candle should give full sparks in all positions of the variable resistor R3 engine. If there are no sparks when connecting to at least one socket, the cover must be replaced with a new one.

Now the electronic ignition system has been fully tested, it remains to replace the faulty elements.

Author: L. Chayi

See other articles Section Automobile. Ignition.

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