MAZDA
01-016-15-3067
厂商技术资料
- 发布日期
- 2015-08-04
- NHTSA 接收日期
- 2017-06-07
- NHTSA 收录编号
- 10105502
厂商摘要
以下为英文原文
SOME VEHICLES MAY EXPERIENCE THE CHECK ENGINE LIGHT ON WITH DTC P0421:00 (CATALYTIC CONVERTER SYSTEM) WITHOUT EXPERIENCING POOR ENGINE PERFORMANCE OR MISFIRE (MITSUBISHI PCM ONLY). THIS IS CAUSED BY IMPROPER CONTROL LOGIC OF THE PCM THAT MAY DETECT FALSE ERROR OF THE A/F SENSOR, RESULTING IN FALSE DETECTION OF P0421. TO CORRECT THE PROBLEM, THE CONTROL LOGIC OF THE PCM HAS BEEN CHANGED. CATALYST MONITOR FUNCTION EXPLANATION
• THE PCM MONITORS THE OXYGEN STORAGE AMOUNT PROPORTIONAL TO CATALYTIC CONVERTER PURIFICATION CHARACTERISTIC.
• THE PCM STARTS TO MONITOR AFTER RECOVERY (FUEL INJECTION STARTS) FROM FUEL CUT CONTROL.
• THE PCM TEMPORARILY CHANGES THE TARGET AIR/FUEL RATIO TO RICH AT FUEL CUT RECOVERY, AND DETECTS THE RESPONSE TIME UNTIL THE HO2S OUTPUT SIGNAL OUTPUTS THE VOLTAGE ON THE RICH SIDE.
• IF THE CATALYTIC CONVERTER PURIFICATION CHARACTERISTIC DETERIORATES, THE AMOUNT OF THE TIME UNTIL THE HO2S DETECTS THE VOLTAGE ON THE RICH SIDE IS SHORTER COMPARED TO THE NORMAL PURIFICATION CHARACTERISTIC AS SHOWN. THE PCM DETECTS A CATALYTIC CONVERTER MALFUNCTION USING THIS CHARACTERISTIC.
• THE PCM MONITORS THE OXYGEN STORAGE AMOUNT PROPORTIONAL TO CATALYTIC CONVERTER PURIFICATION CHARACTERISTIC.
• THE PCM STARTS TO MONITOR AFTER RECOVERY (FUEL INJECTION STARTS) FROM FUEL CUT CONTROL.
• THE PCM TEMPORARILY CHANGES THE TARGET AIR/FUEL RATIO TO RICH AT FUEL CUT RECOVERY, AND DETECTS THE RESPONSE TIME UNTIL THE HO2S OUTPUT SIGNAL OUTPUTS THE VOLTAGE ON THE RICH SIDE.
• IF THE CATALYTIC CONVERTER PURIFICATION CHARACTERISTIC DETERIORATES, THE AMOUNT OF THE TIME UNTIL THE HO2S DETECTS THE VOLTAGE ON THE RICH SIDE IS SHORTER COMPARED TO THE NORMAL PURIFICATION CHARACTERISTIC AS SHOWN. THE PCM DETECTS A CATALYTIC CONVERTER MALFUNCTION USING THIS CHARACTERISTIC.
原文报码
厂商原文中的含义
原文含义可能随车型和后缀变化。此处按来源展示，不代表通用诊断结论。
Mazda
P0421:00CATALYTIC CONVERTER SYSTEM核对适用车辆
车型关联可作为查阅线索；具体发动机、生产范围和软件条件请核对厂商资料。