The sensor of the electric forklift is broken, what failure phenomenon will it cause?

1. Damage to the intake pressure and temperature sensor:

　　①ON gear, the engine fault light is always on; ②A small amount of black smoke is emitted when the accelerator is stepped on the spot, and a lot of black smoke is rapidly accelerating; ③The engine is sluggish; Fault code: P01D6 (intake pressure sensor voltage is lower than the lower limit) Cause analysis: The intake pressure signal is abnormal, and the ECU cannot receive the correct intake air volume information. As a result, the fuel injection volume is also abnormal, and the combustion is insufficient and the engine is sluggish. , Black smoke was emitted during the refueling process. Problems with the wiring harness connection and sensor failure can cause this failure. Solution: Check the intake air pressure and temperature sensor. 2. Water temperature sensor damage phenomenon: 　　 ①ON gear, the engine fault light is always on; ②ON gear water temperature always shows the maximum value of 120℃; ③The engine is limited to torque and sluggish; ④Failure code: P003D (water temperature sensor voltage is lower than the lower limit) cause analysis : The water temperature sensor is invalid. When the ECU detects that the output signal of the water temperature sensor is unreliable, the substitute value is used. The ECU limits the torque of the engine for the purpose of protecting the engine. Solution: Check the water temperature sensor. 3. Damage to the oil pressure sensor: 　　 ①After starting, the oil pressure indicator light is always on; ②The engine fault light is always on; ③Idle speed, the oil pressure value is displayed as 0.99; ④Failure code: P01CA (the voltage of the oil pressure sensor is higher than the upper limit) Reason analysis: the oil pressure sensor probe is seriously damaged, the ECU detects that the oil pressure sensor is not connected, and the value displayed by the meter is the substitute value inside the ECU. Solution: Check the oil pressure sensor. 4. Poor contact of OBD socket terminals: 　　①ON gear, the diagnostic instrument is powered normally, but cannot enter the ECU to read related information; ②There is no fault code. Reason analysis: The OBD socket terminal exits, resulting in poor contact, and the diagnostic instrument cannot communicate with the ECU. Solution: Check the OBD socket terminal. 5. Short circuit phenomenon of the nitrogen and oxygen sensor wire bundle: 　　 ①After starting, the OBD fault light is always on; ②The engine is limited to torque and sluggish; ③Failure code: P0050 (downstream nitrogen and oxygen sensor CAN signal receiving timeout), P018C (downstream nitrogen and oxygen sensor preparation time out). Reason analysis: the nitrogen oxygen sensor harness is worn out, short-circuited to the ground, and the nitrogen oxygen sensor cannot work normally, causing the emission to exceed the standard, the engine torque limit, and the system alarms. Solution: Check the wiring harness of the nitrogen oxygen sensor. 6. Post-processing heating relay box damage phenomenon: 　　①After starting, the OBD fault light is on; ②Fault code: P028F (open circuit fault of the heating relay control end of the urea pressure pipeline). Cause analysis: wire harness open circuit failure. Solution: Check and repair the wiring harness of the heating relay box.