Breakdown model:
Configure 2.4L LAF engine.
Travel course of development:
10283km.
Breakdown phenomenon:
In car travel sometimes many breakdown light is bright, accompany rock of finger of speed watch, water lukewarm table, if pursue,1 is shown.
Graph 1 appearance shows
Breakdown diagnoses:
Do a road to try an examination to car, in travel after close 40min, ECM breakdown lamp shines, electronic hand brake the lamp shines, sideslip lamp shines, emergency warning lamp of ABS/ apply the brake twinkles, speed watch, water is warm at the same time watch finger rock, appearance is given out should become admonitory sound; After car jockeys, start, need to increase travel of accelerator car ability.
When lamp of barrier of another phenomenon hereat shines, in car transport condition won't flameout. But jockey after breakdown lamp shines flameout, shut ignition key, the car when restart does not have reaction, need to await 5min left and right sides to be able to be started again.
With GDS examination, discover ECM/BCM/EBCM/TCM/ power gets lost module, lose communication, and historical malfunction code is U completely kind communication malfunction code.
The U0073/U0140/U0100 in the watch is to correspond kind of malfunction code.
Car malfunction code (DTC) information
Abide is worn right now maintenance train of thought, begin to undertake checking to each communication circuitry and module. The result measures 6 as sutural as 14 (circuit graph is shown 2 times like the graph) resistor is 60 Ω , 6 feet are measured voltage 2V, when voltage is fluctuant like expressing frequency of rock of pressing with a finger (normal when 2.7V) , 14 feet 1.8V, voltage is smooth (normal when 2V) .
Preliminary judgement is breakdown of network of high speed communication, possible hitch is: To positive electrode short circuit, to joining iron short circuit, communication line opens circuit, module breakdown. Try to car route again then, check each module outlet first, and infuse electric glue, but test-drive breakdown as before. Imitate breakdown experiment, be opposite communication line artificially ground short circuit, 6 feet or 14 feet voltage are 0; The person is a short circuit of communication line voltage, 6 feet or 14 feet voltage achieve 12V. And disconnect when TCM or EBCM, express guiding principle not rock. Spot of factitious imitate trouble cannot make breakdown returns. Maintain so far, the feeling of not know what to do having a place. Just at this time a technician puts forward, can appear in breakdown when, does one by one unplug next module experiment? Idea is good, this is detected tweak. Appear in breakdown then when, disconnect EBCM outlet to join again on, breakdown still exists. But in disconnect TCM is inserted again after going up, breakdown disappears instantly, car returns to normal.
Be module of T C M may be put in the problem? The test-drive after changing, the following day breakdown appears again. Since module is no problem, the should receive plug-in unit namely sutural question that leave! To TCM, EBCM then communication inserts a needle to undertake careful processing, install the test-drive after the car, breakdown not reappear.
Breakdown summary:
This breakdown is breakdown of circuitry of high speed communication, but circuit does not have pair of voltage or join iron short circuit, also not be complete open circuit breakdown. Possible reason is, TCM communication line becomes tall in temperature hind, the contact between socket is undesirable increased resistance, because this causes communication voltage to be not stabilized, generation is fluctuant, cause communication from time to time to interrupt, breakdown lamp illumes, appearance finger is fluctuant.
This breakdown is intermittence breakdown, when checking breakdown so more should careful serious, list good examination step, will narrow the limits of breakdown, faster remove trouble.
