Car information
11 CP2, travel course of development 180 kilometers
Breakdown description
Car travel as good as constant, travel after period of time, engine trouble light is bright, breakdown code: Breakdown of system of 56-2 V T C.
Breakdown is analysed and overhaul a process
1, breakdown identifies: Join HDS detects breakdown code, computer shows: Breakdown of system of 56-2 V TC, cleared malfunction code, test-drive travel the breakdown after period of time appears again, display same malfunction code.
2, breakdown analyses the phenomenon that produces according to breakdown, preliminary analysis is likely the reason has:
Breakdown of a powerful person of ① VTC electromagnetism
② VTC controls systematic breakdown
Breakdown of ③ mechanical part
3, breakdown is kept apart
(1) car join HDS, carry detects with the function undertake detecting to VTC system, the measure that asks by H DS undertakes detecting to the system, the result shows systematic trouble, the likelihood controls electromagnetism a powerful person to card lives or jam because of VTC formerly oil path leak, the system has air. The account that produces the most possibly according to the result of the test is breakdown of VTC electromagnetism a powerful person, change VTC electromagnetism a powerful person, but breakdown as before.
(2) photograph data of drive a vehicle quickly with HDS, to VTC working circumstance undertakes an analysis
In graph " CMP is controlled " and " CMP controls an instruction " parameter is obtain through CMP sensor, "CMP controls an instruction " it is to point to engine computer to judge a requirement to take the point of view that gas camshaft shifts to an earlier date according to the actual condition of car, "CMP is controlled " it is the angle that shows the camshaft that take energy of life shifts to an earlier date actually. Both data ought to be synchronous.
From the data graph above we can see, be in when VTC condition when opening, "CMP is controlled " and " CMP controls an instruction " the condition that is in different situation, and " CMP is controlled " maintain from beginning to end in whole process for " 0 " , the specification has two kinds of cases:
The first kind of circumstance, when VTC works, the VTC that is located in the camshaft that take energy of life to go up is carried out implement without drive oil pressure.
The 2nd kind of circumstance, VTC is carried out implement card is dead, oil pressure cannot drive.
The first kind of circumstance, likelihood reason:
A. The signal that computer fails to send a powerful person of electromagnetism of VTC of be sent on a diplomatic mission to work (HDS function test already was done, this eliminates)
B. Breakdown of itself of VTC electromagnetism a powerful person (already changed, this eliminates)
C. Have leak of oil pressure discharge, or oil duct jams (need to tear open spiracle room to cover an inspection)
The 2nd kind of circumstance: Likelihood the reason is VTC is carried out implement in-house card is dead (need to tear open camshaft to check)
Ravel according to the demand that maintains manual oil duct and VTC are carried out related examination of the camshaft that take energy of life implement, detect through atmospheric pressure VTC is carried out implement,
But ravel the discovery when the camshaft that take energy of life, the oily aperture A on camshaft and B are nonexistent, so oil pressure cannot enter VTC to carry out implement. Breakdown reason is in camshaft oil duct raw be caused by.
Trouble removal
According to the technology the demand replaces after the camshaft that take energy of life, test-drive trouble removal.
Experience summary
This car breakdown is more special, but should have correct maintenance train of thought only, reasonable use HDS
Special function, breakdown can be solved likewise!
