Ignition signal generator Mina bullet head distributor type electronic ignition system circuit diagram Mina Zi suspected head without pressure fire phenomenon phenomenon warhead car, assembly electronic control single point injection 3.1LV6 engine. Suddenly turned off during operation. When the starter is hit several times, the engine cannot be started, causing the battery to suffer serious power loss. Inspection and repair First remove the original battery and pick up a fully charged battery. Turn on the ignition switch, start the starter, and confirm that there is no high-pressure fire on the ground of the high-voltage line of the ignition coil. Since the battery has been replaced, the fault code cannot be extracted, and the inspection/Qiu Keke can only be checked according to the principle of the ignition system of the vehicle.
The car is equipped with a built-in 8-pin ignition control module and an electronic ignition advancement system that controls the ignition advance angle of the ECM (see figure). The route of the ignition control module in the distributor is connected to the ground. The working principle is that during the engine starting process, the signal gas spring generated by the ignition signal generator is broken, which causes the speed of the Passat B4 that has been driving 70,000 km to tremble. The trachea has a "sudden" sound, accompanied by acceleration. Smooth phenomenon.
The fourth cylinder was found to be in poor working condition. Focus on 4 cylinders: normal ignition, nozzle power supply and resistance (18 (1) normal; test cylinder pressure: 4 cylinders are between 9.5x1511.0x105, also meet the standard.
In the case of normal ignition, oil supply and cylinder pressure, there is generally no "deficient cylinder". This is carefully checked again and still cannot be resolved. We suspect that there may be problems inside the engine. Specifically, the four cylinders are in a working cycle of intake, compression, work, and exhaust. If the stroke is not working properly, the mixture will be out of alignment. Then, the valve train was disassembled, and it was found that the 4-cylinder exhaust valve spring was broken from the upper portion.
Text / Lu Wen For me, this is the first mechanical failure encountered. When the vehicle is in motion, the hydraulic tappet with a certain pressure first eliminates the valve clearance. Because the valve spring is broken, the spring force is weakened, and the spring force can no longer overcome the pressure transmitted from the tappet, so that the exhaust valve cannot be completely closed, and it cannot be formed reliably. The compressed mixture pressure makes the 4 cylinders work properly. When testing the cylinder pressure, because the engine is only started, the oil pressure is not fully established, the tappet does not enter the working state, and the valve can be closed, so the cylinder pressure is normal.
Replace the valve spring to load the car, the operation is relatively stable, but there is still jitter. Using the VAG.1552 test, entering the measurement data block 001 group, it was found that the oxygen sensor adjustment was extremely slow. Due to the lack of cylinder for a long time, the performance of the oxygen sensor is extremely poor. After the replacement, the test run is stable and the fault is eliminated. Must (please contact the editor of the journal) to enter the ECM. After the engine is started, the ECM immediately transmits a 5V electrical signal to the ignition control module via the bypass line. This signal turns on the ignition control module circuit to make the ignition signal occur. The signal of the device is transmitted to the ECM through the reference line. When the ECM obtains the crankshaft position and speed information from the signal, it immediately sends a signal to the ignition control module through the ignition timing (EST) line, which ensures the spark ignition of each cylinder. Accurate ignition advance angle.
The causes of no high-voltage fire failure are ignition coil damage, ignition control module and accessory damage, ignition switch and line failure, ECM failure, etc.
First check the ignition coil. Disconnect the coupling on the ignition coil and turn on the ignition switch. The ra DC voltmeter measures the “+†terminal voltage on the connector to 12.5V, indicating that the low voltage circuit is normal. The "+" on the battery and the guide wire on the pole directly turn off the primary coil of the ignition coil. At this time, the central high voltage line of the ignition coil has a weak high-voltage fire to the ground, which proves that the ignition coil is intact and has no damage. Open the distributor cover and turn on the ignition switch. The DC voltage meter is used to measure the ignition voltage of the "+" pin of the ignition control module to 12.5V, which is within the normal range. Turn off the ignition switch, disconnect the ignition signal generator plug on the ignition control module, and measure the resistance value of the ignition signal generator with an ohmmeter to 650n, which is also within the normal range. It is preliminarily judged by the above inspection that the ignition control module or the ECM is faulty.
The replacement method is first used to verify the ignition control module.
Take a good distributor assembly of the same type and connect the distributor wiring harness connector, and connect the distributor housing to the ground wire, then turn on the ignition switch and turn the center shaft of the distributor by hand. The central high voltage line of the coil emits a strong high voltage fire to the ground. The test results show that the failure of the car without high-pressure fire is caused by damage to the ignition control module.
Troubleshoot Remove the original distributor from the engine, replace it with an ignition control module of the same type, and install the distributor on the engine in the original position. Then turn on the ignition switch, start the starter, the engine is running smoothly, and the operation is normal. The fault is completely eliminated. (J) â–¡ car maintenance ignition coil
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