Attention! The voltages generated by the electronic ignition system are much higher than the voltages. produced by conventional systems. When working with the system, be extremely careful when turning off the ignition. Those with a pacemaker should stay away from ignition systems and testing equipment. Always switch off the ignition before working on the system.
General information
1. Most failures in ignition systems are due to dirty electrical connections or breakdown of old or damaged insulation, especially in high humidity. If there is a malfunction in the engine management system. first of all, check the condition of all contacts, connectors, wiring, the cleanliness of the air filter, the condition of the spark plugs, the condition of the air ducts and crankcase ventilation hoses.
2. Outdated Ignition Check Methods "for a spark" (disconnecting the high voltage wires one by one from the spark plugs) are not recommended not only because there is a possibility of receiving a strong electric shock, but also there is a possibility of damaging the ignition coil or ECU. You can check the condition of the wire and the candle in operation by unscrewing the candle and attaching it to the mass with a crocodile from the cigarette lighter. It is very important to ensure good contact with the mass. Never try to pass "diagnostics", by removing the high voltage wires while the engine is running.
Engine won't start
3. If the engine does not rotate with the starter, or rotates very sluggishly, first check the condition of the battery and starter. Connect a voltmeter between the battery terminals (Connect the positive lead of the voltmeter to the positive terminal of the battery), turn off the ignition by disconnecting the wiring connector from the ignition coil. Rotating the engine with a starter for no more than 10 seconds, measure the voltage at the battery terminals. If the voltage drops below 9.5 V, first check the condition of the battery, starter and charging system - see chapter 5A.
4. If the engine turns over as expected, but does not start, check the ignition system by connecting a stroboscope (according to the manufacturer's instructions) and turning the engine over with the starter. If the strobe flashes, then the current gets through the high-voltage wire to the spark plug, which must be removed and checked. Check the fuel system as described in the relevant part chapter 4. If the strobe does not flash, check the high voltage wires - see chapter 1A.
5. On models without a distributor, check the condition of the high-voltage wires and the ignition coil, as described in paragraph 3 of this chapter.
6. If a spark is not detected, in this case, the malfunction may be in the engine control system. Contact your Audi/VAG dealer for assistance.
Cylinder misfires
7. Irregular gaps indicate a possible unreliable connection in the low voltage part of the ignition system or a violation of the high voltage circuit.
8. Turn off the ignition, check the reliability and cleanliness of the contacts of all connectors of the ignition system.
9. Make sure high voltage wires and ignition coils are clean. Check the condition of the spark plugs (if necessary, by substitution with a known good) covers of the ignition distributor, its coal and slider (if provided).
10. Regular misfires indicate a faulty one of the high voltage spark plugs, a loss of compression in one of the cylinders, or a faulty one of the fuel injectors.
11. If there is no high voltage on one particular wire, the fault may be in the wire itself or in the distributor cap (if provided). If there is high voltage on all wires, check the condition of all candles.
Other problems
12. If it was not possible to determine the cause of the malfunction, contact a dealer who has specialized diagnostic equipment for this.
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