Chery A21 2005 Service Manual page 280

7．CAN-BUS main line
The CA N data bus designed by the BOSCH c ompany is applied b y
Chery A5, sh own as fig ure 14-8. This enables the data communication of
eac h compute r, and for ms the on-board network syst em. The in strument is
con nectted to the engine EMS、A BS、front ISU computer by C AN line and
sha re the dat a. The CA N end of instrumen t is 29、30； the C AN end of
eng ine ECU i s 62、81；and the C AN end of front ISU is A25、A26.
Mainta in way o f the CAN data tra nsmissio n system
①BUS line test
The in spect of c onnect ca pability、 open circ uit or sho rt circuit、
com puter po wer or gro und.
② Clo se the ign ition swi tch, cont rol the u nit plug, and do no t
con nect the wiring harness plug at the tim e. Test th e resistan ce between
the 62nd and 81st pin of A5 en gine con trol unit, this is th e resistan ce
val ue of the d ata trasmission end port, the prescripti ve value is 123Ω, if it
is n ot so, plea se replace the engin e control unit.
③DTC logical d ecision.
④Sign al wavefor m test.
Fr ont ISU Co mbination
In strument
A26 A25 30 29
C AN-H
CAN-L
Figu re14-8 CAN-BUS main li ne
3 2
8．Other position circuit diagram
Fro n t ISU Fus e
ECU
62 81
F ront turn Lamp
Trunk Sw itch Installation pos iti on of night l amp and headlamp adjusting switch
An ti-Theft Horn
Front IS U
Door Con tact Swit ch
Horn Sw itch
Front Engine
Compar tment
Cover Switch
I nstallatio n position of front
e ngine co mpartmen t cover
a nd trunk switch
Diagnos is Plug