Mercedes-Benz 3320 car transmission lock failure example model 2001 Mercedes-Benz 5320 sedan.
Fault phenomenon After the transmission is geared, it is called the lock.
Troubleshoot, find the 08016 needle diagnostic seat at the bottom left of the board, and connect the car Bosch fault diagnosis analyzer correctly. Turn on the ignition switch and select the 220 chassis 1 transmission system in the Mercedes-Benz model for fault detection. Select the read fault code function. When the car Bosch host was displayed, the fault code, 2300 reappeared.
As the name suggests, 2300 into the network communication failure, that is, the transmission control unit. The human 1 network system fails, and the data exchange function is lost with the elbow 2 engine control unit 3 electronic stability program control unit and the redundant tool board control unit. This may be an internal fault in the transmission control unit.
Connect the car Bosch fault diagnosis analyzer again, enter the instrument board system, read the fault code, and the car Bosch host performs the function of clearing the fault code, and the fault code cannot be cleared. So, on the right side of the engine, the transmission control unit was removed from the electrical box, wow! Why are so many oils, oil! Look closely, this oil is the transmission oil.
After removing the transmission oil, try again and troubleshoot.
However, why is there oil in the transmission control unit? The transmission oil is passed through the solenoid valve harness to enter 2300 people to perform the function of clearing the fault code through the network communication fault, and the system is normal.
But the engine is restarted and hung in the 0-speed display 81072 Jade 1 electronically controlled automatic transmission. This situation often occurs, waiting for everyone to pay attention. mouth. 1Communication failure phenomenon In 2003, after the cylinder head carbon was produced for cleaning and the intake and exhaust valves were ground, there was a phenomenon of acceleration and weakness.
Troubleshoot Find the 16-pin diagnostic seat under the air conditioning panel and connect it correctly. 20008 car fault computer diagnostic analyzer. Turn on the ignition switch and select the engine system in the Volkswagen Audi system for fault detection. Select the fault code reading function, the instrument display engine system has a fault code memory fault code 1 camshaft position sensor, 40 KSs signal abnormality after clearing the fault code function, when the fault code is read again, the engine system is not very good I did not check the mileage. The mileage of the car was only 25,000km. It can be said that it was a new car. Later, the car was parked for one night and could not be started on the first day. After being towed to the repair shop, it is detected by a computer detector and has no fault code memory. Check the cylinder pressure and find that the pressure of the third cylinder and the fourth cylinder is almost zero. The cylinder head is removed and found to be serious. The carbon deposit is serious, and the carbon deposits fall off and stay on the valve seat, resulting in the valve closing is not strict, so the cylinder pressure is insufficient. Can't start. After cleaning the carbon deposit and grinding the valve seat, the cylinder pressure returns to normal, the engine can start smoothly, and the static acceleration feels normal. However, when the road test feels the car is rushing, and the acceleration is weak, the speed is difficult to reach 601. According to the owner The situation and the result of the above computer detection determine that the cause of the malfunction is concentrated on the camshaft position sensor 040. After analysis, the possible reasons are as follows: Camshaft position sensor, 40 signal is wrong, beyond the normal working range; camshaft position sensor, 40 installation position is wrong, the valve timing is wrong, the camshaft position sensor computer is damaged.
After in-depth discussion, we believe that the cause of the failure is not likely to be due to the fact that the camshaft sensors 040 and 01 have not been removed. The focus of the question is locked on 1 and 3.
We analyzed the waveform of the camshaft sensor 040 with the car's 02000 car obstacle computer diagnostic analyzer. The result is that the 5-square wave is quite standard. This shows that the camshaft sensor 40 works normally.
Is the timing of the gas distribution wrong, but after the vehicle's maintenance technicians have considered it, it is considered that the valve timing should not be asked. It may be on the mounting chain of the variable camshaft adjuster because he did not disassemble it. Make a mark.
Based on this clue, first consult the maintenance information of the Volkswagen Bora car, and learn that the standard distance between the intake camshaft and the groove on the exhaust camshaft is 16 chain rollers.
Remove the valve chamber cover, shake the first cylinder to the top dead center position, and check that the groove distance on the intake camshaft and the exhaust camshaft is 15 chain rollers, and the root cause of the fault is finally found. After the adjustment, the problem is solved completely, and the engine is restarted, and the fault code 16725 is no longer present. Port fault code memory. However, when the engine is started, the fault code 16725 appears again, indicating that the fault code is a hard fault code. If the fault code no longer appears, it is a historical fault code memory or a soft fault.
The owner of the car reports that the vehicle condition 040 signal is not synchronized with the crankshaft speed position sensor signal when the vehicle is not being repaired; 4 engine folding 18 port special group free technical service hotline 8008305028
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