ELECTRICAL SYSTEM
14 - 20
DC
B
A
Troubleshooting
The electronic control unit ECU monitors various sensors, actuators, power amplifier circuits and
detection circuits. Common fault codes are shown in the fault list.
!
When the fault of oxygen sensor signal is checked, the engine should be run for at least 5-10min to
ensure the completion of heating of oxygen sensor.
Oxygen sensor failure check:
◆ Check whether the oxygen sensor connector is well connected
◆ Unplug the connector, check whether the sensor and the wire harness end pins are bent or
deformed, etc.
◆ Check whether the resistance between pins【B】and【D】is normal
◆ Check whether the voltage between pin【B】and the main relay is normal
◆ Connect the connector and run the engine for a period of time, check whether the voltage between
pins【A】and【C】is normal.
In addition, the oxygen sensor is an indirect refl ection sensor. If other sensors are faulty, the
oxygen sensor will also report a fault:
◆ Unreliable battery voltage
◆ The absolute pressure signal of the intake manifold is unreliable
◆ The signal of the engine temperature sensor is unreliable
◆ Injector driver stage failure
!
When disassembling the oxygen sensor, be careful of the muffl er and engine, and be careful of burns!
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