Triumph 2010 Tiger 800, Service Manual

Page: 24 / 508

General Information
Tracing Circuits
The following is a description of two types of
common electrical failures, and some of the
methods which may be used to find them.
Open circuit
B reak
l_
A break in an electrical circuit - current cannot flow.
Usually caused by a break in a wire or cable c or by a loose
connection. Open circuits can often by intermittent,
making diagnosis difficult.
Short circuit
A 'short cut' in an electrical circuit - current by-passes the
intended circuit, either to earth or to another, different
circuit. Often caused by failure of the cable insulation due
to chafing or trapping of the wire. There are two different
types of short circuit - short to ground and short to Vbatt.
A short to ground means that the current is going to earth
before it reaches the component it is supposed to feed.
These are often caused by chafing of the harness to the
frame or wires trapped between a bolted component, and
will often blow the fuse on that circuit.
A short to Vbatt is a short to battery voltage ( 1 2 Volts)
and is caused by a live power supply wire contacting an
adjacent cable. Note that it is also possible for a
5
Volt
sensor reference voltage to short to an adjacent circuit,
which can also cause electrical failures and DTCs
<Diagnostic Trouble Code) to be stored.
When tracing a wire that is suspect, carefully check the
circuit diagram before starting. Remember:
•
a wire may diverge at a splice and go off to
feed other circuits. If these circuits are
working, check for wiring faults from the
splice onwards.
•
the circuit diagram is not an accurate guide
to the actual location of the parts when fitted
on the bike. lt is a schematic diagram of the
circuits.
particularly where engine management items
are concerned, the circuit is only completed
by the ECM. If the ECM is not connected, the
circuit may register as open.
To Check Continuity:
Ensure the circuit being tested is switched off before
measuring continuity. Damage to the Digital Multi
Meter <DM M> may result from testing a 'live' circuit with
the meter set to resistance (Q).
In the example below, the ground circuit continuity is
being tested from the battery to the frame.
•
•
•
•
•
•
Continuity <resistance) Check
locate each end of the wire .
Set the Digital Multi Meter <DMM> to
resistance check
(Q).
Probe each end of the wire.
If there is continuity, the meter will usually
bleep or register the resistance of the cable.
A high resistance figure could indicate a dirty
or corroded connection.
'
If there is a break in the wire, the meter will
not bleep or register a resistance.
By probing the wire in various places, the
position of a high resistance or break in the
wire (open circuit> can be narrowed down
until it is found.
1.16
SeNice
Manual
-
Tiger
800 and
Tiger
800XC