（1）故障灯状态说明：
本电控系统的故障灯一般位于仪表盘显示屏上（如下图所示），个别整车厂也可能把故障灯布置于仪表盘的按键位置。正常来说，电控系统上电后，未起动发动机时故障灯是常亮的，发动机起动后故障灯熄灭，如果出现电控系统上电后故障灯不亮，此时可能是故障灯或其驱动线束有问题；如果电控系统上电后故障灯闪烁，此时可能发动机存在电控系统相关故障（可能为当前故障或历史故障），若其故障为历史故障则发动机起动后故障灯会熄灭，历史故障码一般可以通过关钥匙后断开发动机供电总闸片刻（20秒以上）来清除；如果电控系统上电后，故障灯常亮或闪烁，发动机起动后故障灯仍然常亮或闪烁，则发动机可能存在电控系统相关故障，此时可以通过读取故障闪码来判断是什么故障以针对性检查排除故障。
故障灯
（2）故障闪码的读取方法和输出原理：
在电控系统上电后，当ECM的56#针脚接收到接地信号后，故障闪码功能将被激活并通过故障指示灯闪烁输出。
当ECM监测到用户请求故障闪码输出时，ECM将通过闪码按照顺序以一个标准次数输出一个标准代码。
该标准代码设置为123，故障代码闪码输出标准次数设置为3次。标准代码以标定的次数输出后，第一个储存在ECM中的历史故障码将以同样的速度和次数输出，然后根据储存在ECM中的故障脉谱依次输出故障码，ECM不会根据故障码激活的先后顺序输出故障码。如果没有历史故障码了，那么将一直重复输出标准故障码。图一为一个通过故障灯闪码进行故障输出的一个例子：
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Time (sec)
V o l t a g e P o t e n t i a l A c r o s s M I L (V D C )
Number of times to repeat a code A
B D
E
C
F 1 Previously Active DTC
(DTC 221)Default 1 Code- 123G
说明：该例子中闪码输出次序是先输出标准码123，然后逐一输故障码，标准码和故障码输出时均连续闪2遍，上述读取的故障码为221，可对应诊断手册查故障码DTC221查相关故障解析。
玉柴故障闪码输出相关参数设置如下表：
MIL Blink Code Timings
Delay before start of code blinking 启动闪码功能之前的延时时间 200 Ms Blink on-time 闪亮时间
400 Ms Blink off-time 闪灭时间
400 Ms Time between digits in a code
一个故障码中的数字之间的间隔时间 1200 Ms Extra time between code repeats 一个故障码的重复周期 2000 Ms Extra time between codes 故障码之间的时间周期
3000 Ms Extra time before starting codes over 启动一个更新的故障码的时间周期 2000 Ms
Number of times to repeat a code 故障码重复次数
3 Default first code (always output) 缺省的第一个故障码（一直输出）
123
Key-on engine-off stored fault MIL on-time 钥匙开关打开、发动机不启动，但有历史故障码时故障灯亮着的时间
4500 Ms Key-on engine-off stored fault MIL off-time 钥匙开关打开、发动机不启动，但有历史故障码
500 Ms
时故障灯灭的时间
Power derate mode MIL fast-blink on-time
降功率保护时MIL快闪亮时间250 Ms
Power derate mode MIL fast-blink off-time
降功率保护时MIL快闪灭时间250 Ms （3）故障代码及故障解释列表
故障码/闪码
故障描述
rank and/or cam could not synchronize during
start--曲轴信号或凸轮轴信号启动时不能同步16
FP low voltage91
FP high voltage92
MAP voltage low--进气岐管空气压力(MAP)电
压低107
MAP pressure high--进气歧管压力高108
发动机故障灯亮IA T higher than expected stage 1--IA T高于1级
限值111
IA T voltage low--IA T电压低112
IA T voltage high--IA T电压高113
ECT higher than expected stage 1--ECT高于1级
限值116
ECT voltage low－ECT/CHT电压低117
ECT voltage high－ECT/CHT电压高118
TPS1-2 lower than expected－TPS1比TPS2低121
TPS1 voltage low－TPS1信号电压低122
TPS1 voltage high－TPS1信号电压高123
IA T higher than expected stage 2－IA T高于2级
限值127
BP pressure low－大气环境压力低129
EGO1 open / lazy－氧传感器开路/罢工134
EGO3 open / lazy140
EGO2 open / lazy154
EGO4 open / lazy160
Adaptive-learn gasoline bank1 high171
Adaptive-learn gasoline bank1 low172
Adaptive-learn gasoline bank2 high174
Adaptive-learn gasoline bank2 low175
FT low voltage182
FT high voltage183 Gaseous fuel temperature sender low voltage187 Gaseous fuel temperature sender high voltage188 ECT higher than expected stage 2－发动机冷却
液温度高于2级限值217 RPM higher than max allowed govern speed－发
动机转速比最大允许调速转速高219 TPS1-2 higher than expected－TPS1比TPS2开
度高221 TPS2 voltage low- TPS2 信号电压低222 TPS2 voltage high- TPS2 信号电压高223 Boost control overboost failure234
TIP active- TIP传感器报错236
TIP low voltage- TIP电压低237 TIP high voltage-TIP传感器电压高238
Injector 1 open or short to ground261 Injector 1 coil shorted262 Injector 2 open or short to ground264 Injector 2 coil shorted265 Injector 3 open or short to ground267 Injector 3 coil shorted268 Injector 4 open or short to ground270 Injector 4 coil shorted271 Injector 5 open or short to ground273 Injector 5 coil shorted274 Injector 6 open or short to ground276 Injector 6 coil shorted277 Injector 7 open or short to ground279 Injector 7 coil shorted280 Injector 8 open or short to ground282 Injector 8 coil shorted283 Injector 9 open or short to ground285 Injector 9 coil shorted286 Injector 10 open or short to ground288 Injector 10 coil shorted289 Boost control underboost failure299
Knock1 excessive or erratic signal326
Knock1 sensor open or not present327
Knock2 excessive or erratic signal331
Knock2 sensor open or not present332 CRANK input signal noise－曲轴输入信号有干
扰336 Crank signal loss 曲轴输入信号丢失337 CAM input signal noise 凸轮轴输入信号干扰341
Loss of CAM input signal 凸轮轴输入信号丢失342 Catalyst inactive on gasoline (Bank 1)420 Catalyst inactive on gasoline (Bank 2)430 Roadspeed input loss of signal502
IAC ground short508
IAC coil open/short509 Oil pressure sender high pressure521
Oil pressure sender low voltage522
Oil pressure sender high voltage523
Oil pressure low524 Oil pressure sender low pressure524
Vbat voltage low 电源电压低562
Vbat voltage high 电池电压高563
Microprocessor failure - FLASH 微处理器失效601 Microprocessor failure - RAM--微处理器-随机
存储器失效604 Microprocessor failure - COP 处理器-COP部
分失效606 Start relay coil open615
Start relay ground short616 Start relay coil short to power617
Fuel pump relay coil open627 Fuel-pump high-side open or short to ground628 Fuel pump relay control ground short628
Fuel-pump high-side short to power629
Fuel pump relay coil short to power629 Sensor supply voltage 1 low 提供给传感器的5
伏参考电压1低642 Sensor supply voltage 1 high 输出的5V参考电
压1高于预定值643 MIL open 故障灯开路650
Sensor supply voltage 2 low652
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