kính các cụ, mấy hum nay e làm con acura MDX cứu hộ về xưởng, xe đang đi thì chết máy. ko báo lỗi j cả, kiểm tra thấy có điện cao áp, điện kim phun nhưng ko có điện bơm xăng, kiểm tra kỹ thì thấy mất điều khiển từ hộp ECU ra rơ le bơm xăng, đấu trực tiết thì xe nổ bình thường, đo điện khiển rơ le bơm xăng thì có thấy 7v, không đủ để điều khiển rơ le, e chưa dám kết luận thay hộp ECU, hộp này khá đắt nên chứa dám đặt, cụ nào đã chơi ban bệnh này chỉ giáo e với, thank các cụ.
Bạn đo được 7v ở đâu? Bạn có thể cho biết những chỗ bạn đã kiểm?
Fuel Supply System
Fuel Cutoff Control
During deceleration with the
throttle valve closed, current to the
injectors is cut off to improve fuel economy at engine speeds over
850 rpm. Fuel cutoff control also occurs when the engine speed exceeds
6,600 rpm, regardless of the position of the throttle valve, to protect the engine from over-revving. When the vehicle is stopped, the
PCM cuts the fuel at engine speeds over
5,000 rpm. On a cold engine, fuel cut occurs at a lower engine speed.
Fuel Pump Control
When the
ignition switch is turned on, the PCM grounds PGM-FI
main relay 2 which feeds current to the
fuel pump control module. The PCM sends a signal to the
fuel pump control module to operate the fuel pump for
2 seconds to pressurize the
fuel system. With the engine running, the fuel pump speed is controlled in four levels by the fuel pump control module. The PCM decides the fuel pump speed by the calculation of the
injector activation time and engine speed and sends a operation command signal to the fuel pump control module. This operation made possible to decrease fuel pump noise at low engine speed.
PGM-FI Main Relay 1 and 2
PGM-FI main relay 1 is energized whenever the
ignition switch is ON (II) to supply battery voltage to the PCM, power to the injectors, and power for PGM-FI main relay 2. PGM-FI main relay 2 is energized to supply power to the fuel pump (fuel pump control module) for
2 seconds when the ignition switch is turned ON (II), and when the engine is cranking or running.
