Troubleshooting Methods
许多线束间的连接都不太牢固。 这可能会造成永久性或间歇性的电气故障。 进行任何测试前，请确保连接器均牢靠地固定。
一个电子零部件出现故障可能会引起其他零部件出现故障。
注: 使用卡特彼勒数字万用表来测量电压或电阻。
在测试过程中检查电压时，电压须至少达到 24 伏，才能形成"有电压"的状态。 如果电压在 24 伏以下，则是"无电压"状态。
如果使用卡特彼勒数字万用表测量导通性时，出现 1 或 2 欧姆以上的电阻，则找出形成电阻的原因。 排除问题并继续进行故障诊断和排除。
在导通电路上存在近 300 欧姆的电阻时，牵引力控制系统电子控制模块仍可正常工作。 任何高于 1 或 2 欧姆的电阻都属于不好的情况。 这说明电路连接不良或有腐蚀。
测试程序中有许多步骤都需要用到测试导线组件，以将插头或插座的接触件接地。 测试导线组件包括一个鳄鱼夹、一段导线、电工胶带以及一个引脚或插孔。 为确保良好的连接，将导线焊接到引脚或插孔上。 同时还要将这段导线焊接到鳄鱼夹上。 然后用电工胶带缠好接头。
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| 图 1 | g00322046 |
测试导线组件 | |
Caterpillar Information System:
793B Off-Highway Truck Cooling System Coolant Extender (ELC) - Add
416C, 426C, 428C, 436C and 438C Backhoe Loaders Hydraulic and Steering System Control Valve (Stabilizer)
Challenger 35, Challenger 45 and Challenger 55 Agricultural Tractors Alternator and Fan Belts - Inspect/Adjust/Replace
793B Off-Highway Truck Cooling System Coolant Additive (DEAC) - Add
789B Off-Highway Truck Hydraulic System General Information
950G and 962G Wheel Loaders and IT62G Integrated Toolcarrier Power Train Transmission Oil Pump - Assemble
793B Off-Highway Truck Steering Linkage - Inspect
793B Off-Highway Truck Front Wheel Oil - Change
793B Off-Highway Truck Frame and Body Support Pads - Clean/Inspect
740 Articulated Truck, 768C, 769C, 769D, 772B, 773B, 773D, 773E, 773F, 776, 776B, 776C, 776D, 777, 777B, 777C, 777D, 777F, 784B, 784C, 785, 785B, 785C, 785D, 789, 789B, 789C, 789D, 793, 793B, 793C and 793D Off-Highway Trucks and 771C, 771D, 775B, 775 Service Tools
793B Off-Highway Truck Frame and Body - Inspect
793B Off-Highway Truck Fan Drive Bearing and Belt Adjusting Pulley - Lubricate
Challenger 35, Challenger 45 and Challenger 55 Agricultural Tractors Air Conditioner Condenser - Clean
416C, 426C, 428C, 436C and 438C Backhoe Loaders Axles, Differential and Brakes Differential (Standard)
793B Off-Highway Truck Cooling System Level - Check
793B Off-Highway Truck Cooling System Relief Valve - Clean
950G and 962G Wheel Loaders and IT62G Integrated Toolcarrier Power Train Relief Valve (Transmission Hydraulic Control) - Remove
Challenger 35, Challenger 45 and Challenger 55 Agricultural Tractors Battery - Inspect
950G and 962G Wheel Loaders and IT62G Integrated Toolcarrier Power Train Relief Valve (Transmission Hydraulic Control) - Install
Challenger 35, Challenger 45 and Challenger 55 Agricultural Tractors Battery or Battery Cable - Replace
966G and 972G Wheel Loaders Power Train Relief Valve (Transmission Hydraulic Control) - Disassemble
793B Off-Highway Truck Fuel System Secondary Filter - Replace
740 Articulated Truck, 768C, 769C, 769D, 772B, 773B, 773D, 773E, 773F, 776, 776B, 776C, 776D, 777, 777B, 777C, 777D, 777F, 784B, 784C, 785, 785B, 785C, 785D, 789, 789B, 789C, 789D, 793, 793B, 793C and 793D Off-Highway Trucks and 771C, 771D, 775B, 775 Lamp Checks
793B Off-Highway Truck Hoist Screens - Clean