C100121 - TroubleshootingC100121-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
C100121	Brake pedal sensor failure制动踏板传感器故障	1. The driver depresses the accelerator pedal and brake pedal at the same time1.驾驶员同时踩下油门踏板和制动踏板
		2. The current pressure sensor value is too small relative to the push rod.2.当前压力传感器数值相对于推杆形成过小
		3. Monitoring detects leakage in the master cylinder circuit3.监控探测到主缸回路存在漏液
		4. The current pressure sensor value is too large relative to the push rod.4.当前压力传感器数值相对于推杆形成过大

Troubleshooting steps故障诊断步骤

①Operation check操作检查

1. Check whether the driver depresses the accelerator pedal and brake pedal at the same time.检查驾驶员是否存在同时踩下油门踏板和制动踏板的操作。 Are the test results normal?检查结果是否正常？ Yes是 Go to step 2.去步骤2。 No否 Avoid such abnormal operations.避免此类非正常操作。

②Check brake lines检查制动管路

1. Check the brake pipeline for damage, leakage, etc.检查制动管路是否存在破损、泄露等现象。 Are the test results normal?检查结果是否正常？ Yes是 Go to step 3.去步骤3。 No否 Repair or replace faulty parts.维修或更换故障部件。

③Check brake wheel cylinder检查制动轮缸

1. Check the brake wheel cylinder for damage, leakage, etc.检查制动轮缸是否存在破损、泄露等现象。 Are the test results normal?检查结果是否正常？ Yes是 Go to step 4.去步骤4。 No否 Replace brake wheel cylinder.更换制动轮缸。

④Check brake fluid检查制动液

1. Check whether the brake fluid has deteriorated or contains too much water.检查制动液是否变质、含水量过大。 Are the test results normal?检查结果是否正常？ Yes是 Go to step 5.去步骤5。 No否 Replace brake fluid.更换制动液。

⑤Replacing the integrated brake control unit更换集成式制动控制单元

1. Replace with a new integrated brake control unit and check whether the fault code and symptoms are eliminated.更换新的集成式制动控制单元，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 integrated brake control unit, you need to use a diagnostic tool to recalibrate the integrated brake control unit.更换集成式制动控制单元后，需用诊断仪对集成式制动控制单元重新标定。 ♦  After replacing the integrated brake control unit, the brake line bleeding operation is required.更换集成式制动控制单元后，需进行制动管路排气操作。