A 2004 Bora 1.8L comfortable sedan, the owner of the car found a strange noise coming from the car. The repairman test found that the auxiliary brake vacuum pump kept moving for a long time and occasionally stopped for a few minutes.
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Bora equipped with controllable pump, engine load, speed, throttle position and brake light switch signal, calculates the pressure in the brake booster, the engine control unit and the engine control unit performs an intake manifold pressure model according to In contrast, the decision whether to open the vacuum pump. The abnormal sound of the car may be a failure of a certain part of the controllable vacuum pump.
Connect the VAS5051, enter the 01 address, use the 02 function to read the fault code, and display three permanent fault codes that cannot be cleared, namely the tank ventilation valve N80 fault, the air flow meter G70 fault and the oxygen sensor heater fault.
Found visually, the car itself and the installation of a reversing radar alarm, immobilizer and a long horn is fixed on the firewall tapping screw, the screw is too long to pierce the main wiring harness of the engine electronic control unit of a pair, and wherein a grounding wire broken skin. According to the circuit diagram, the wire is the air flow meter, the fuel tank ventilation valve and the oxygen sensor heating coil power supply. The three wires share one fuse S243, and the fuse is blown.
Blown fuse caused a fault
After the fuse is blown, the air flow meter, the fuel tank ventilation valve, and the oxygen sensor heating coil have no working power. If the engine electronic control unit does not receive the load signal (air flow meter signal), and after comparing with the standard data, it is considered that the vacuum pressure inside the brake is insufficient, so that the auxiliary brake vacuum pump is controlled to operate, thereby causing the above failure.
Re-wrapping the finishing line, and then starting the test, the fault code can be cleared, and no longer reappear, the auxiliary brake vacuum pump does not move frequently, and the fault is completely eliminated.
When troubleshooting difficult problems, the idea must be broad, especially when several fault codes appear at the same time, and can not be cleared, usually there is a certain relationship between them, so we should use the method of connected thinking to analyze.
As LCD display in YFJ company that we usually use it to military grade battery ,especially Lithium-ion batteries ,for these battery applications ,we have obvious advantage is that we focus more on shor circuit protection which we follow the US military standard.
Short circuit protection:The following test shall be performed. Charge batteriesas specified in ; use of 4.6.3 is permitted. Measure and record the OCV. Short each battery across all the positive and negative terminals with a total external resistance not greater than 50 milliohms. After one hour remove the short from across the terminals. Measure and record the OCV. Stabilize batteries at the normal conditions of 4.3.1 for not less than 2 hours. Chargebatteries in accordance with 4.6; use of 4.6.3 is permitted. Stabilize batteries at normal conditions for not less than 2 hours, then discharge the battery in accordance with 4.7.2.3. The battery shall meet the requirements of 3.7.2.3.
Li-Ion Battery With Lcd Display
Charge voltage: 16.8V
Nominal voltage : 14.8V (4S7P)
Initial impedance : 120mΩ
Nominal capacity: 19.6Ah
Minimum capacity: 19.4Ah
Communication methods : SMBUS data communication
Electricity quantity show: LCD Electricity quantity show
Charge current: Standard Charging::0.2C5A (3.9A)
Rapid charge: 0.5C5A C(9.8A) Max
Standard Charging method : 3.9A(0.2C5A) CC(constant current)charge to 16.8V,then CV(constant voltage 16.8V)charge till charge current decline to ≤196mA(≈0.01C5A)
Charging time:Standard Charging: 6.5hours(Ref.)
Rapid charge: 3.5 hours(Ref.)
Max.discharge current: 9.8A(0.5C5A)
Discharge cut-off voltage: 10.0V
Cycle life (0.2C5A/0.2C5A) : 500 items,≧80%DOD; 300 times,≧80%DOD
Operating temperature : Charging: 0℃~45℃
Discharging:-20℃~+60℃
Li-ion Battery With LCD Display
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