Power Sources
发动机向 ECM 供电。 ECM 会向以下部件供电：
- 发动机上的所有传感器
- 燃油喷油泵电磁阀
- 废气旁通阀电磁阀
- 诊断接头
- 电子单体喷油器
预热塞由蓄电池直接供电。
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| 图 1 | g01334436 |
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ECM 示意图 | |
ECM 和系统的供电来自 24 伏或 12 伏蓄电池。 ECM 的电源含有以下部件：
- 蓄电池
- 断路开关
- 点火开关
- 保险丝
- 接地螺栓
- ECM 接头
- 机器接口接头
ECM 示意图显示了典型电源电路的主要部件。 蓄电池电压通常连接至 ECM。 来自点火开关的输入将会接通 ECM。
可以旁通导线线束来进行故障诊断与排除。
可以使用电子维修工具上的显示屏幕来检查电源电压。
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| 图 2 | g03347144 |
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压力传感器示意图 | |
ECM 通过 ECM 接头向各传感器提供 5 VDC 电源。 电源具备短路保护功能。 传感器或导线线束中的短路不会损坏 ECM。
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| 图 3 | g01201233 |
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预热塞示意图 | |
Caterpillar Information System:
Buffer Seal Assembly May Wear and Cause Leaks in the head of the Lift Cylinder on Certain Track-Type Tractors and Wheel Dozers{5102} Buffer Seal Assembly May Wear and Cause Leaks in the head of the Lift Cylinder on Certain Track-Type Tractors and Wheel Dozers{5102}
C7.1 Engines for Caterpillar Built Machines Electronic Control System
336F MHPU Mobile Hydraulic Power Unit Machine System Specifications Control Valve
336F and 340F Excavators Machine System Specifications Swing Gear and Bearing
259D, 279D, 289D, 299D and 299D XHP Compact Track Loaders, 257D, 277D, 287D, 297D and 297D XHP Multi Terrain Loaders and 236D, 242D, 246D, 262D, 272D and 272D XHP Skid Steer Loaders Machine Systems Refrigerant Condenser - Remove and Install
966M Tier 4, 966M Tier 4 Series XE, 972M Tier 4 and 972M Tier 4 Series XE Wheel Loaders Manual Valve - Remove and Install
2013/02/19 An Improved Transmission Pressure Sensor is Now Used on Certain Pipelayer, Track-Type Loaders, and Track-Type Tractors {1408}
Procedure to Install an Improved Air Cleaner Group for the Rear Engine on Certain 627H Wheel Tractor-Scrapers{1051} Procedure to Install an Improved Air Cleaner Group for the Rear Engine on Certain 627H Wheel Tractor-Scrapers{1051}
The Quick Coupler Can be Activated from the Soft Panel Switch for 387-3167 Valve and Lines Gp-Coupler Kit on Certain 980K Wheel Loaders{1408, 1435, 5057, 5133, 6129} The Quick Coupler Can be Activated from the Soft Panel Switch for 387-3167 Valve and Lines Gp-Coupler Kit on Certain 980K Wheel Loaders{1408, 1435, 5057, 5133, 6129}
C7.1 Engines for Caterpillar Built Machines Fuel Injection
C7.1 Engines for Caterpillar Built Machines Turbocharger - Inspect
C7.1 Engines for Caterpillar Built Machines Air Inlet and Exhaust System - Inspect
C7.1 Engines for Caterpillar Built Machines Glossary of Electronic Control Terms
C7.1 Engines for Caterpillar Built Machines Air in Fuel - Test
C7.1 Engines for Caterpillar Built Machines Fuel Injection Timing - Check
990K Wheel Loader Fuel Tank Cap and Strainer - Clean
Rear Axle Bolted Joint Modified On Certain 994H Wheel Loaders {3013, 3268, 3278} Rear Axle Bolted Joint Modified On Certain 994H Wheel Loaders {3013, 3268, 3278}
990K Wheel Loader Fuel Tank Water and Sediment - Drain
D10T2 Track-Type Tractor Sensor Supply - Test
966M Tier 4, 966M Tier 4 Series XE, 972M Tier 4 and 972M Tier 4 Series XE Wheel Loaders Diesel Exhaust Fluid Module - Remove and Install
D10T2 Track-Type Tractor Systems Inlet Manifold
903C Compact Wheel Loader Safety Messages - Work Tools
986H Wheel Loader Machine Systems Piston Pump (Brake) Pressure - Test and Adjust
901C, 902C and 903C Compact Wheel Loaders Emissions Certification Film