富康al4（Beverly AL4）.doc

富康al4（Beverly AL4） AL4 transmission oil pressure adjustment fault The oil pressure regulation failure is a common fault in the AL4 electronically controlled hydraulic automatic transmission. Fault phenomenon: a car to force the third limp speed, hit the car at a speed variable speed throttle, clutch slipping, similar to the. Dashboard movement and snow (SPT, *) lights flashing. Use the PROXIA scanner to detect the pressure changes, deviations, or settings on the screen. Because there are many factors that lead to this fault, the diagnosis ideas and procedures are as follows: The general idea is: the oil inspection and control computer connector inspection, idle hydraulic pipeline inspection, pressure sensor inspection and pressure control solenoid valve, hydraulic control check box inspection, loading computer (upgrade) operation. Specific procedures are as follows: 1, oil inspection Oil deterioration or improper oil will cause oil pressure adjustment failure. Take out the transmission fluid, and find that the odor is pungent or mixed with iron, aluminum and plastic debris, which is determined to be replaced by oil deterioration. The method of checking the quantity of oil is as follows: the car is parked on the level ground, put into the P gear, and fill with 0.5 L oil in the transmission. Start the engine to the transmission oil temperature rise to 58 to 60 DEG C, with the oil gushing from the gas oil can receive, such as receiving oil up to 0.5 L, the surface normal; less than 0.5 L, the oil is less; more than 0.5 L, the oil liquid. 2, plug inspection If the plug is broken or inserted, the signal transmission will be interrupted or distorted, and the oil pressure adjustment will become invalid automatically. Switch off the ignition, pull off the transmission control computer, hydraulic box connector to observe, such as insert piece without distortion, ablation phenomenon, re insert, and then test run, observe whether the failure or not. 3, check the idle oil press