Breakdown phenomenon: A Sangdana car of 2000 GS ｉ , travel ｍ of 80 thousand ｋ , MK20-I of this car equipment prevent adopt dead brake system, lamp of breakdown of this car ABS shines, car advocate leave to repair a factory to undertake the overhaul.
Breakdown analysis: Above all, use breakdown of yuan of the eye that sign report to diagnose appearance to read take malfunction code, undertake detecting to ABS system, show " 290 " , for breakdown of G46 of sensor of rotate speed of left rear wheel. Usually, 3 kinds of circumstances will bring about ABS system to appear under this kind of breakdown:
(１ ) when speed exceeds ｈ of ／ of 10 ｋ ｍ , deliver ABS to control unit without rotate speed signal.
(2) be more than moment of ｈ of ／ of 40 ｋ ｍ when speed, rotate speed signal exceeds tolerancepublic errand value.
(3) sensor existence can know other open circuit or be opposite breakdown of short circuit of positive electrode, ground connection.
According to experience, should inspect the following item mainly:
(１ ) annulus fast the circuit connection case of sensor and ABS control unit.
(2) annulus fast position of sensor and the installation clearance that tine encircles, installation and the case that get dirt or foreign matter pollution.
(3) whether does wheel bearing clearance pass big.
(4) sensor itself breakdown.
In this car in trouble removal process, not was eager to examining round of fast data above all. engine idle fast movement, the choice reads data piece function, enter ００１ indication group, with lift litre of machine to promote the car, observation shows data each.
The wheel is dormant moment, each show the area all shows ｈ of ／ of 0 ｋ ｍ . With hand roll left rear wheel, the 3rd indication area shows ｈ of ／ of 9 ｋ ｍ . Turn again other wheel, observe corresponding indication area, discovery agrees basically. Drop car, with breakdown diagnostic appearance keeps clear of malfunction code. ABS caution light goes out subsequently, it is normal that the road tries everything.
Read with diagnostic appearance take measure data piece function, enter indication group 2, watch rate of left rear wheel of the 3rd indication area. No matter be being quickened, when decelerate, apply the brake, low speed or high speed, its are numeric rather he 3 annulus fast agree basically. ABS caution light did not shine, also can feel ABS system is in when apply the brake effective, breakdown also did not appear. Because did not discover fault again, with respect to preparation car of chief commander allowing a car is received.
Be in at this moment, breakdown appeared again. In car idle fast move car fall asleep when, breakdown caution light shined. The discovery that move a code generates the abiogenesis sex malfunction code of left rear wheel again. Inspect a condition according to this car, only one is plant likelihood, that is sensor of rotate speed of left rear wheel and ABS control instantaneous short circuit produces between unit or open circuit. When according to circuit the graph undertakes checking, the 10th needle has the 25 needle plug that discovers ABS controls unit slight corrode. Clear after repair outlet, cleared malfunction code. Car advocate drive ｍ of 2000 much ｋ also did not appear original breakdown.
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