7=SimSun is driven by the smashing, the automatic 篙邃 篇 广州 广州 广州 Guangzhou Honda Automobile Zhongping special sales service shop 3,221 Wang, a Lumina sedan produced by the US General Motors, the engine and body shake at a speed of 80901, No fault code. After repeated repairs by several repair shops for nearly one year, a series of routine inspections and computer tests were performed, and no obvious source of failure was found. It has also been suspected that it is 0, the engine control module is faulty, but several times the same type of trouble-free car has been replaced because of the long-term repeated discharge of several factories, the routine inspection can not be considered, so first use it directly in the road test. The computer detector detects the working state when the fault occurs. The computer detector lifts the flywheel to the transmission output shaft to reduce the sliding loss on the torque converter. The valve is repeatedly in the working non-working state, and the state change frequency is coincident with the jitter frequency when the vehicle fails. After the dismantling of the transmission to replace the valve, the fault still exists. The explanation is not the question of the 10 valve itself. Then, is it possible that the 10-valve is not working properly due to a malfunction of the signal that controls the operation of the 10 valve? When the ECM provides a grounding signal for the solenoid valve in the transmission to control the operation of the 10-valve, it is necessary to identify the engine and the transmission system. A number of input signals, which are mainly bright, but the engine is running and the test on the road is normal. At this time, it is suspected that the oxygen sensor fault has a relatively reliable basis. Because the electronic control engine loses the oxygen sensor feedback signal, it will follow the fixed procedure. Most of the 0.45 is a fixed parameter to calculate and control the fuel injection amount instead of the closed loop adjustment fuel injection. Quantity, also known as the enable protector. This program can basically maintain the normal operation of the engine.
Remove the two oxygen sensors and they are all clean, light gray, and the head is slightly white. In addition, the engine exhaust does not emit black smoke, and no oil, which means that the mixture is not rich. According to this, the car failure is caused by the engine mixture being too lean, and has nothing to do with the automatic transmission. The mixture gas is too thin due to the high feedback voltage signal actually supplied by the oxygen sensor, that is, the output characteristics of the oxygen sensor have been shifted.
In the engine mixture closed-loop control process, the oxygen sensor provides a signal that the engine is sufficiently warmed up according to the coolant temperature 07 sensor; the vehicle speed sensor 58 provides a vehicle traveling speed higher than a certain, vehicle speed signal, and the throttle position sensor liver 5 provides The engine is not in the state of acceleration or deceleration; 1 intake manifold pressure or air flow signal provided by the intake manifold absolute pressure sensor or air flow sensor; 6. parking neutral, switch input selector lever from the station The finger signal of the vehicle neutral shift to the drive or reverse gear.
After improvement, it was found that the air flow boy signal was unstable. The main reason for measuring the cylinder pressure due to the instability of the air flow signal is the component itself and the cylinder pressure. The third cylinder pressure is low and there is a slight back gas phenomenon. Judging from this, it may be because the intake valve is not closed tightly, and the air return is caused to cause the air flow input signal to fluctuate, resulting in 0俜3. Noisy luck, such as the joy of the sodium, so that the 10 valves are not working at work. Unstable state. Disintegration of the cylinder head verification, the third cylinder intake valve ablation. After the valve is replaced, the road test is performed and the fault is eliminated. Received date 20010613 The air-fuel ratio of the mixture changes, and a voltage feedback signal with a pulse width change is sent to 01. Because the voltage signal actually fed back by the oxygen sensor is higher than the signal of normal feedback, the control reduces the fuel injection amount and reduces the engine speed. After the oxygen sensor detects an increase in the oxygen concentration in the exhaust gas, it transmits a feedback signal that increases the amount of fuel injection, thereby causing the engine speed to fluctuate up and down. Moreover, the signal fed back by the oxygen sensor does not exceed the normal amplitude range, so 0; no fault code memory, the fault light does not light.
Under this circumstance, it is recommended that the owner change two oxygen sensors, but since the car has been repaired many times in other repair shops, it has cost more than 40,000 yuan, and the owner is afraid to spend money again, so it was not replaced at that time. It was not until more than 10 days later that two new oxygen sensors were replaced when it was unavoidable. After that, the malfunction disappeared.
27 car maintenance and repair
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