supply connected, the relay should be heard to click and there should be continuity
between pins 30 and 87. An open circuit indicates a faulty relay.
CAN (Controller Area Networking)
CAN (sometimes called CANbus) is a protocol for data communication between
Electronic Control Modules (ECMs). Each ECM on the network is connected by a
single pair of twisted wires (or bus) which are used for the transmission of vehicle
sensor data. By using CAN, the overall number of system sensors, and the amount of
cabling required to allow ECMs to communicate with each other is greatly reduced.
This saves cost, weight and space, and makes the system more reliable, as the
physical number of wires and connections is reduced.
4
5
16
R
U
B28
B27
A34
B
KY
1
3
2
CAN works by each ECM sending out 'packets' of information (such as engine speed
or fuel consumption information) on to the network bus (note that the network must
be free of data before any ECM is allowed to transmit). This data is given a priority
according to its importance (for example 'engine speed' may have a higher priority
than 'low fuel level'), so that even if two ECMs send data at the same time, high
priority information is always sent first. Lower priority data is then resent after the high
priority data has been received by all ECMs on the network.
The receiving ECM confirms the data has been received correctly and that the data is
valid, and this information is then used by the ECM as necessary. Specific data not
required by an ECM will still be received and acknowledged as correct but then
disregarded (for example if an ECM does not require 'clutch switch position'
information, this data packet would be ignored).
This allows for a very high speed system of communication, which is also very
reliable. Should one ECM fail or transmit corrupted or otherwise incorrect messages,
none of the other ECMs on the network will be affected, and after a certain time that
ECM will be prevented from transmitting further messages until the fault is rectified.
This stops the ECM from clogging the network with incorrect data and preventing
Service Manual - Scrambler 1200 XC
28 of 640
Summary of Contents for Scrambler 1200 XC
Page 67: ...ckju Evaporative Hose Routing Service Manual Scrambler 1200 XC 67 of 640 ...
Page 134: ...Exploded View Clutch Cover Service Manual Scrambler 1200 XC 134 of 640 ...
Page 135: ...Exploded View Alternator Cover Service Manual Scrambler 1200 XC 135 of 640 ...
Page 159: ...Exploded View Cylinder Head Service Manual Scrambler 1200 XC 159 of 640 ...
Page 291: ...Exploded View Gear Selector Service Manual Scrambler 1200 XC 291 of 640 ...
Page 333: ...Oil Circuit Diagram Service Manual Scrambler 1200 XC 333 of 640 ...
Page 374: ...Exploded View Fuel Pump Service Manual Scrambler 1200 XC 374 of 640 ...
Page 375: ...Exploded View Fuel Rail Throttles and Injectors Service Manual Scrambler 1200 XC 375 of 640 ...
Page 377: ...Exploded View Exhaust System Service Manual Scrambler 1200 XC 377 of 640 ...
Page 378: ...Exploded View Evaporative System if fitted Service Manual Scrambler 1200 XC 378 of 640 ...
Page 619: ...Service Manual Scrambler 1200 XC 619 of 640 ...