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Heater matrix
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Heater control valve
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Replace a Spare part Blower control unit – a defective one or if the limit of use has been already reached. Find out useful information about Blower control unit
Malfunctions of the control unit
micro cracks in the board;
physical damage to transistors, tracks;
factory immobilizer blockage;
failure of the peripheral elements;
failure of the output stage ignition control;
failure of the control channels.
Symptoms of the control unit failure
vibratory noise;
lack of contact with the injector control, power plugs, fuel pumps;
lack of idle air control valve management;
no signal of additional relays and units control;
incorrect reaction to the lambda control, the temperature sensor;
open throttle body injection nozzle.
Causes of the control unit faults
mechanical damage;
intervention in the vehicle electronics;
frequent voltage fluctuations;
incorrect installation of the block;
corrosion of the connecting elements;
severe overheating of the equipment;
fault of the injection or ignition output circuits;
dismantling the battery terminals with the engine running;
switching the starter with a disconnected power bus;
continuous vehicle exploitation on poor quality surface roads;
moisture getting on the modules.
Diagnostics
To determine the control unit fault you must use a special diagnostic module, which is attached by a cable to the vehicle's diagnostic socket. The control unit transmits coded information about all faults through the module to a computer. A special program interprets the codes. At the time of diagnosis it is also necessary to use the equipment for measuring sensors and determination of signals. For this purpose oscilloscope and multimeter are used. Then you need to check the control unit for physical damage.
Repair and replacement of the control unit
The average service life of the vehicle control unit is 10 years. DIY repair is difficult. To replace the unit you need to disconnect the battery, then replace the old control unit, which is located under the seat or under the dashboard components. Having installed a new part, be careful when connecting the battery. Do not forget to reprogram and configure the unit using the car scanner.
