Maintenance Tips: Electronic Control Cooling Fan Control Maintenance
Vehicle during use, the engine will produce excessive heat
. To make the engine will not overheat and not work properly, it is designed Coolant Cycle cooling system, cooling fan which has played a pivotal role. Cooling fan for electronic control, the vehicle control method used are different, the following examples on the combination of two failures, to understand how the two common methods of electronic fan control working principle and maintenance. Related Reading: How to extend the life of the engine valve train Modified turbo engine intake system introduced
Example 1 1 Audi V62.4L displacement of the car, the car does not change because of e-fan cooling system, leading to "boil", and the open air when the electric fan is still not operating. Zhe Liang Audi radiator fan controls, is controlled by the fan for Heat sensitive relay switch realized bond strap. The car's radiator and fan system consists of two electronic fans in their red lines connect wiring harness for the positive line, Brown line bond strap (directly fixed to the beam on), while the red cathode ray beam on the right side of a cathode terminal at a fixed.
Which control the red positive wire into the fan low speed relay, air conditioning and fan speed relay control relay. In Service Should pay attention to their specific location, the fan speed relay box located in motor insurance, the right side of the first three relay location, the fan speed relays installed in the Drive Deputy Insurance members at the foot of the 217 relay box. The fan's low, high speed through the radiator, double thermal sensitive switch according to coolant temperature, control relays bond strap achieved.
When you open the air-conditioning switch, fan relay control through the air conditioning fan relay to fan rotation speed. 217 relay the ground wire (green / yellow line) and double thermal sensitive switch is connected, once the coolant temperature rise to a certain temperature, the dual control of the thermal sensitive switch relay bond strap, will enter the high-speed cooling fan running . In addition, the 217 relay and control the main line of fire line of fire were in the ignition switch is open Wen armed Yun?
Car cooling fan system according to the principle, and upon inspection the car is missing a fan speed relay (user reflect this car repair shop for maintenance over the other). But after its installed, only the high-speed block without cooling fan low speed gear. After careful examination, found that 217 relay burned, resulting in a high-speed cooling fan always running, will replace the 217 relay, the fault disappears. Example 2 a Samsung Caravan cars in the process of moving water temperature table shows the temperature normal, but stopping the engine Idle Operation, although the water temperature table shows 90? L00 between the time the cooling system has been "boil." At this time, found that cooling fan can not operate. Car cooling fan control, and Audi cars have very different control methods. Zhe Liang Samsung Caravan car cooling fan through the use of computer-controlled vehicles. The inspection, lack of control ground cooling fan relay. Run the engine at idle state, with the thermometer measuring the actual temperature of the coolant has reached 110 , the water temperature table can still direct the car in 90? 100 between. Temperature sensor plug with a multimeter measuring the resistance value of 100 ohms or so, so, initially suspected to damage the water temperature sensor plug.
No alternative parts in the case, get a sliding 2k ohm variable resistor in parallel with the water temperature sensor plugs to reduce the resistance. If the Adjustment of sliding variable resistor, so that the temperature of the water temperature table shows actual temperature consistent with the cooling fluid, the cooling fan actually with the normal operation of the temperature.
Appears to have been because the water temperature sensor plug. As the water temperature sensor plug is damaged, it has always been to a car computer cooling fan can not make the wrong signal at low temperature. Cooling fans naturally will not operate. Finally, the water temperature sensor plug replacement, the car returned to normal.
Can see, the car's computer to receive temperature sensor plug the input signal, when the temperature reached the specified value, the computer will control the fan relay ground bond strap, so that cooling fan. These are two different control methods, but as long as we figure out how they work, a serious fault careful examination and analysis, can also solve this problem quickly.
Maintenance Tips: Electronic Control Cooling Fan Control Maintenance
By: betty
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