• Fault code: P2185enginecoolingLiquid temperature sensor 2 too large signal static
Check the maintenance process
After the vehicle is parked, the electronic fan will not work. No matter whether the vehicle is cold or hot, the electronic fan will not work after the ignition key is turned on, but onceengineWhen it is running, the electronic fan will turn constantly.The customer also said that the electronic fan once appeared at around 20000 km, which was caused by water ingress into the fuse box when washing the car. This time, it reappeared after the car had been repaired due to an accident a few days ago.
When asked the customer, he learned that the fuse box had water ingress at that time, but after using compressed air to dry it, he saw that the electronic fan operated normally and did not replace it.
It was doubted at first that the electronic fan would rotate normally due to the corrosion of residual water traces, because such cases had been encountered before.
Then the SB fuse box in the engine compartment was disassembled, and it was found that there was indeed corrosion inside, and a lot of green rust could not be cleaned inside. At this time, a new fuse box was installed.During the test run, the electronic fan still keeps running.
Use the fault diagnosis instrument VAS5052A to diagnose the vehicle. There is a fault code P2185 in the engine control unitcoolingThe signal of liquid temperature sensor 2 is too large and static;
After reviewing the maintenance records, we found that the water tank, condenser, electronic fan assembly and oxygen sensor were replaced due to an accident at the front of the vehicle, and the rear of the vehicle was also reshaped and painted.
According to the fault code, it is analyzed that the vehicle has two water temperature sensors, G62 on the left outlet pipe of the engine and G83 on the left drain pipe of the water tank. It is doubted that the G83 water tank outlet cooling temperature sensor or its harness may be damaged due to the accident.
According to the circuit diagram, pull out the connector of the coolant temperature sensor 2 located at the bottom left of the water tank, pull out the connector of the engine control unit, and conduct the on-off test on the two wires T2r / 1 and T80 / 36, and T2r / 2 and T80 / 21.The harness is normal without short circuit or open circuit. Carefully check the circuit diagram and find that the T4ao/3 pin of the oxygen sensor downstream of the exhaust catalytic converter and the T2r/2 pin of the coolant temperature sensor 2 are connected to the T80/21 pin of the engine control unit. Suddenly, it occurs to replace the oxygen sensor in case of an accident and find the replaced old oxygen sensor,It is found that the wires of connector T4ao / 1 and T4ao / 3 are damaged. It is estimated that the heating wire of the oxygen sensor and the signal control grounding wire of the oxygen sensor controlled by the engine control unit are short circuited at the moment of collision, burning the control grounding circuit in the engine control unit, and the engine control unit is damaged.
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1. G83 water tank outlet coolant temperature sensor damaged
2. The circuit connected to the sensor is abnormal
3. The engine control unit is damaged.
Others may have been ruled out, leaving the engine control unit.
Replace the engine control unit with a new one. The fault code becomes sporadic. Clear all fault codes.
Re match and code the engine control unit, and eliminate the fault of constant rotation of the electronic fan after starting the vehicle.
The vehicle returns to normal.
Maintenance summary
At the moment of collision, the oxygen sensor was squeezed and deformed by the larger impact force.Due to oxygen sensing
The shell of the device is made of metal, and the wire is led out from the inside
The metal edge is like a sharp knife to cut the wire, causing the inner part of the wire to collide with the shell
To form a short circuit between the wires and between the wires and the housing.Due to the oxygen sensor in the wire
Signal wire, oxygen sensor heater live wire, oxygen sensor heater control ground wire, easy to exit
The live wire and the control grounding wire are short circuited momentarily, causing the electronic components in the engine control unit to be electrified
The flow is damaged, resulting in an internal open circuit of the control unit without control.Due to engine coolant
The control ground terminal inside the temperature sensor 2 and oxygen sensor oxygen sensor control unit is open circuited
The engine control unit cannot receive the signal from the engine coolant temperature sensor 2.launch
The engine control unit thinks that the engine coolant temperature sensor 2 is damaged, and the engine control unit
Enter the protection mode, and the electronic fan will be forced to rotate after starting the car.
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