MULTIPLEXING
Diagnostics - Dealing with faults
88B
88B-7
Diagnostics - Dealing with faults
FAULTY SEGMENT
NOTESFirst check that the computer at the end of the faulty segment is properly
supplied (earth, + battery, + accessories or + after ignition).
Always check that the computer is operating correctly.
Important: the tool may not be able to pinpoint the faulty segment(s). It then suggests
several segments that could be faulty. In this event, repair the segment nearest to the
diagnostic socket.
Isolate the faulty segment by disconnecting both ends of the segment. Check the condition of the connections.
Check the continuity of the Can H and Can L lines between the two connectors of the isolated segment.
Refer to the Help with finding short circuits section for computer and connection track allocations.
Perform the necessary operations to ensure the continuity of the two lines (for example, replacing the wiring).
Make sure the computer present in the vehicle is compatible with the Scénic II and that the data it is producing
is correct.
Reconnect the segment.
Carry out a new multiplex network test with the diagnostic tool.
Is the segment still declared faulty?
NoEnd of fault finding.
YesAre there other faulty segments?
NoRepeat the multiplex network tests to check the continuity and
insulation of the Can H and Can L lines between the end of the
faulty segment and the diagnostic socket.
YesApply the same procedure to each segment.
AFTER REPAIRCarry out a new multiplex network test with the diagnostic tool.
Clear the stored faults on all the computers connected to the network.
Deal with any other possible faults.
