你好，我这里有一台玛莎拉蒂GTS，报发动机5678缸失火，

展开

可能原因： 正时变速器熔断器 变位器 发动机控制节点 (NCM) 检查确认 - Digital Multimeter - Oscilloscope - Box 150way (cod. xxxxxx – HW01BOX) - Motronic Interconnector (cod. xxxxxxxx) - Diagnosis system + - Battery disconnected ECU disconnected 1 A01 GND Electronic ground 1 (chassis) 200 Ω < 1Ω 2 A02 GND Electronic ground 2 (chassis) 200 Ω < 1Ω 3 A04 GND Electronic ground 3 (chassis) 200 Ω < 1Ω 4 A53 GND Reference Ground 200 Ω < 1Ω 5 A46 A01 GND signal from inertial switch 200 Ω < 1Ω 6 B36 B51 Engine revolution sensor impedance 2K Ω 1000Ω ±10% 7 A13 A64 Air flow temperature sensor impedance (signal) 20k Ω 2kΩ±5% 8 A85 A64 Air flow sensor impedance (signal) 2M Ω 270kΩ ±10% 9 B10 B14 Internal temperature sensor (engine) 2M Ω To temperature environment 10 A15 A53 External temperature signal (radiator) 2M Ω To temperature environment 11 A67 A01 C-CAN line isolation 2M Ω 12 A68 A01 C-CAN line isolation 2M Ω 13 A67 A68 Public C-CAN Network impedance 200 Ω 60Ω ±5% Battery disconnected ECU connected 14 A67 A68 Public C-CAN Network impedance 200 Ω 60Ω ±5% -30°C = 40KΩ 130°C = 90Ω - Key in STOP position. - Disconnect power supply from the vehicle using battery disconnector. - Connect power supply unit to battery in parallel. - Check condition of protection fuses. - Visually check the condition of the connections present on the wiring of the components being examined. - Connect box (cod. xxxxxxxx), the 3 Male-Male cable bundles 50PIN and the Maserati interconnector (cod. xxxxxxxxx) to the vehicle wiring, leaving the ECU disconnected. Necessary equipment Preliminary operations for checks N Tester Terminals ..\..\immagini\Ferrari_Cavallo.wmf Maserati M139 4.7 RST - Engine Control Node (Motronic ME9) ../../immagini/NCM_CENTRALINA.jpg DIAGNOSIS DATA SHEET N. 01 2,5KΩ ±10% >1MΩ Component / Check Operations Range and U.M. Value Notes 018_0177_DX 1/5 + - N Tester Terminals Component / Check Operations Range and U.M. Value Notes Battery connected ECU disconnected 15 A92 A01 Permanent power supply (+30) 20 V= Vbat B