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Volkswagen's new Langyi's turn-off maintenance at low speed

Le 9 juin 2018, 11:27 dans Humeurs 0

 

1、Models: New Sunny

2, mileage: 32480

3, the phenomenon of failure: the vehicle in the idle condor xc-009 state or at low speed, sometimes there is no response to fuel, and then turn off, after the flameout can be smoothly started, and returned to normal.

4, fault code: Enter 01 engine control unit to read the fault code, the system is normal, without any fault code.

Maintenance station inspection and diagnosis:

1. The road test failed to test the fault phenomenon described by the customer, but the customer told us that it was accidental, sometimes not, and that the vehicle exceeded the warranty quickly, hoping to give a one-off solution to the problem.

2, enter the 01 engine control unit to read the fault code, the system is normal, without any fault code.

3, When the vehicle is idle at idle speed autel md808 or at a low speed, consider the oil circuit, the power supply system, and the line problem. The control unit is unreliable and the sensor is damaged.

4, The engine fuel pressure is tested. At idle, the pressure of the low-pressure fuel is 6.7 bar, and the pressure value is normal. Considering that the gasoline is not fully burned, the flame may be extinguished or it may not be accelerated. Carry out fuel tank cleaning on the fuel system. Replace the steam filter and clean the carbon deposit in the combustion chamber. The nozzle is also cleaned. The fault persists.

5, The next step is to check the engine's power control system, power supply relay circuit, power supply relay itself, engine control unit circuit, and ground. One week after leaving the station again.

6, connect the remote diagnostic instrument, carry out the road test, carry on the data measurement of each sensor and analyze the trouble of the vehicle.

From the above data, the engine's intake air amount and ignition advance angle are all within the normal range, as well as the fuel rail

Adjustment of system pressure did not find any abnormal data.

For the above test data cgdi key programmer remote diagnostic instrument for data measurement and data download corresponding observations, at the same time with the road test status simulation failure. From the data, the pressure of the reaction engine and the voltage of the throttle position sensor are normal. However, when data monitoring was downloaded, it was found that there was no working signal at throttle position 2, and the fault point was locked.

From the above data, it can be analyzed that the throttle control unit is damaged and there is a short-circuit fault in the line from the throttle valve to the engine control unit. Measurements are made on the connection line of the throttle valve to the engine control unit. To find pin virtual connection or short circuit, the fault point is attributed to the throttle control unit. Replaced the new throttle control unit, tracked back to the one-month failure did not appear, troubleshooting.

Summarize and share:

In the face of some trouble-free storage of fault cars, it is necessary to fully consider, the reason why the number of maintenance of the car so much, mainly technicians are starting from the oil road to repair. Blind replacement accessories. In addition to experience, Hyundai Motors has to use the latest diagnostic equipment to repair faulty vehicles, which can greatly reduce maintenance time and improve maintenance efficiency. Reduce customer complaints.

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The fault light of the Camry engine is filled with water

Le 4 mai 2018, 12:30 dans Humeurs 0

 

Symptoms: Check the engine fault light and side-slip indicator to light up the alarm. After the technician received the car, the two fault lights were still on. The idle engine runs smoothly.

Open the cover and find that the direction of the battery connection terminal is abnormal, the two cans of the canister solenoid valve are connected incorrectly, and there are many installation errors. The customer was then asked to know that the car's engine was damaged due to heavy rain and drowning. It was xhorse lighted after a small repair shop had repaired the fault lamp within 3 days. After obtaining the customer's consent, the wrong alignment and piping were corrected first. After the test, the fault light was still on and the fault code was still P0012. It is determined that there is an actual fault in the engine system.

Fault diagnosis: Judging from the above preliminary inspection, the direction of the fault should be on the timing and on the VVT-i system. Considering that the engine has just been overhauled, there is a high possibility that timing and error will be correct. The valve chamber cover was removed and the cgdi timing and tension of the chain were checked. No abnormality was found. It seems that the timing lag should be on the VVT-i system. The active test of the VVT-i control system was immediately conducted through IT-II, and when the engine was idling, the intake camshaft advance angle was 0° when 49% of the VVT-i actuator was intentionally controlled by IT-II. The engine idle speed is still running smoothly. In normal circumstances, when the forward advance reaches 49%, due to the transitional overlap of the intake and exhaust valve opening angles, excessive exhaust gas enters the cylinder, and the engine's idle speed should be severely unstable and extinguished. It can be understood that the VVT-i system does not advance or retard the intake camshaft as instructed.

Possible causes of analysis are: 1VVT-i actuator stuck. 2VVT-i system oil filter plugged 3VVT-i oil engine oil blockage. 4 Control solenoid valve stuck or faulty. According to the degree of difficulty in construction, the solenoid valve was first dismantled for electrical testing, and the result was that the valve core was not stuck. Then, the oil filter of the VVT-i was dismantled. No plugging or foreign matter was found. Is this failure a failure of the VVT-i actuator or the blockage of the oil passage? To find out whether the oil gallery is blocked, think of a way to inject compressed air into the oil passage hole of the VVT-i strainer. As a result, the oil hole in the autel md808 cylinder head vented, indicating that the oil passage of the VVT-i was not blocked. Is it true that the VVT-i actuator is really broken? Considering that the amount of work required to disassemble the VVT-i actuator is too large.

Ask the customer again about the process of overhaul. The customer reflected that the water had bent a connecting rod and changed the 4 connecting rods and 4 piston overhaul kits. The cylinder head did not move. The camshaft has not been decomposed. The VVT-i actuator itself is not likely to fail. It seems that the failure must be re-analyzed. After careful observation of the VVT-i solenoid valve, it xhorse key machine suddenly became apparent (as shown in Fig. 2) that the original solenoid valve spool was accidentally rotated at a certain angle to form a seal between the solenoid valve and the oil hole in the cylinder head. This caused the failure. After the last replacement of the VVT-i solenoid valve, engine oil and engine oil grid, the VVT-i was tested actively. The test was passed, the engine was turned off, and the fault was eliminated.

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How does an automobile generator charge the battery?

Le 16 avril 2018, 12:37 dans Humeurs 0

 

The charging of the battery by the engine is not much related to the time, mainly related to the operation of the engine. When the engine is idling, the charge indicator will go out and the generator will begin to generate electricity. The higher the engine speed, the greater the power generation. After the vvdi prog adapter generator's power generation meets the power requirements of the vehicle's electrical equipment, the rest will be Charge the battery.

The engine, AC motor, battery, and electrical load on the car are an interconnected system. That means when the engine is autel md808 pro idling, the current generated by the generator can not charge the battery. However, it is guaranteed that the battery will not consume power.

The balance of energy on the car also needs to be considered. The restart of the engine after shutdown must take into account the state of charge of the battery. The battery can be considered as an energy storage device and supplies various loads. In turn, the alternator must charge the battery. Energy provider. Battery MQB IMMO If the discharge exceeds the charge, then the battery with a large capacity will be discharged step by step until it is vented. So many people say that the ideal state is to balance the energy of the input and output of the battery.

In fact, the charge indicator on the vehicle does not indicate whether the battery is charging or whether the engine is charging at what speed. When the alternator is under heavy load, the charging indicator light will be extinguished and the battery will not be charging but discharging. It is also important to note that if the charge indicator does not go off at high speed, it indicates that the alternator, regulator, line, or drive belt has failed.

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