C166004 - TroubleshootingC166004-故障诊断

Fault code description故障码说明

DTC故障码(DTC)	Fault code description故障码描述	Possible cause of failure可能故障原因
C166004	The EPS main chip is faulty and the CPU is seriously faulty.EPS主芯片存在故障，CPU严重故障	1.Flash Memory data verification error1.Flash Memory数据校验错误
		2.RAM data verification error2.RAM数据校验错误
		3.NVM module error3.NVM模块错误
		4. CPU core errors, including key register failures, clock monitoring failures, and floating-point number errors.4.CPU内核错误，包括关键寄存器故障，时钟监测故障，浮点数异出故障
		5.CPU peripheral device error (CMA, P-bus)5.CPU外围设备错误(CMA, P-bus)
		6. MCU operation errors, including startup exceptions, running timing abnormalities, and interrupt exceptions6.MCU运行错误，包括启动异常，运行时序异常，中断异常
		7. Abnormal voltage inside the main chip7.主芯片内部电压异常

Troubleshooting steps故障诊断步骤

①Power on check上电检查

1. Repower the vehicle, use the diagnostic tool to read and clear the fault codes, and check whether the fault codes and symptoms are eliminated.车辆重新上电，使用诊断仪读取并清除故障码，检查故障码及症状是否排除。 Are the test results normal?检查结果是否正常？ Yes是 Fault resolved.故障排除。 No否 Go to step 2.去步骤2。

②Replace the electric power steering column更换电动助力转向管柱

1. Replace the electric power steering column with a new one and check whether the fault code and symptoms are eliminated.更换新的电动助力转向管柱，检查故障码及症状是否排除。 Are the test results normal?检查结果是否正常？ Yes是 Fault resolved.故障排除。 No否 Look for causes from other symptoms.从其他症状查找原因。   Caution:注意： ♦  After replacing the electric power steering column, you need to use a diagnostic instrument to recalibrate the electric power steering column.更换电动助力转向管柱后，需用诊断仪对电动助力转向管柱重新标定。