Summary: Signal of Electromechanical unit P/N is wrong, bring about car to cannot be started
Model
Golf A6, 56728KM of travel course of development, the date that buy a car on January 20, 2012, maintain date on August 5, 2013
Breakdown phenomenon
Open ignition switch, the car that start, hit motor not to have any reaction, the archives on assorted appearance indicator light is in archives with twinkle back and forth between spanner.
Breakdown diagnoses a process
One, hitch is possible case study
1, storage battery voltage is too low;
2, ignition switch breakdown;
3, ignition switch comes breakdown of circuitry of J519 actuating signal;
4, J682 breakdown;
5, breakdown of J682 relevant circuitry;
6, J682 comes starter breakdown of 50 terminal circuitry;
7, starter itself breakdown;
8, P/N archives signal;
2, breakdown is diagnosed
1, open ignition switch, function of the headlight before examination horn is mixed is normal, detect with avometer storage battery voltage is 12.60V, prove storage battery voltage is normal;
2, with VAS6150 examination 09- central electric equipment controls data of unit ignition switch to shed 63 groups of the first division, ignition switch is located in the archives that start when, indication terminal 50 put through (see a picture 1) ; Prove from this: Ignition switch, ignition switch comes line of J519 actuating signal is normal.
△ pursues 1
3, electric equipment controls data of signal of unit P/N archives to shed 64 groups of the first division in the center of examination 09- , archives when be located in P/N archives, show did not hang (see a picture 1) , normal circumstance should show already hanged;
4, data of information of staff of shift gears of unit of examination gear-box control flows, the 4th group 1 with 2 areas, be elected as archives lever to hang corresponding archives when, data shedding shows corresponding file information (see a picture 2) ; Prove gearlever E313 comes from this the archives of Electromechanical unit it is normal that information is delivered;
△ pursues 2
5, the T52c/30 that checks J519 outlet comes the T25/16 foot of gear-box outlet (see a picture 3) , archives it is 11.7V in the voltage when P/N/R/D/S archives (see a picture 4) ; Normal circumstance, archives when P/N position, voltage should be 0V (see a picture 5) , archives just be 11.7V when R/D/S archives;
△ pursues 3
△ pursues 4
△ pursues 5
6, analyse as a result according to afore-mentioned examinations, breakdown car archives no matter still be in in P/N R/D/S archives when, the T52c/30 foot voltage of J519 is 11.7V, then J519 always thinks gear-box archives it is to be located in blame P/N archives, when making motor, cannot activation 50- starts relay;
Breakdown reason
Electromechanical unit attaint brings about J519 to cannot identify P/N signal correctly
Analyse breakdown case afresh
1, understanding archives information delivers a line, the society analyses a problem through data shedding, when archives information shows abnormal when, check the circuit link between J519 and Electromechanical unit above all;
2, combinative circuit graph measures circuit, when normal traffic should hang P/N archives, electromechanical unit is met this line ground connection, pass P/N archives information J519, after identifying a P/N archives only, j519 ability puts through starter.
Breakdown handles way
Change Electromechanical is unit
Link the proposal that this case gives
1, understanding archives information delivers a line, the society analyses a problem through data shedding, can decrease to the quantity is measured and be changed greatly time, improve efficiency;
2, combinative circuit graph measures circuit, when normal traffic should hang P/N archives, when making reference without mark fiducial value, can contrast with normal traffic.
