1989-Montero · wiring diag · страница 7 из 91 · Открыть оригинал PDF ↗
TROUBiiSHOOTlNG
A circuit consists of the power supply, switch, relay, load,
ground, etc. There are various methods to check a circuit
including an overall check, voltage check, shortcircuit check
and continuity check. Each of these methods is briefly
described in the following.
1. VOLTAGE CHECK
(I) Ground one lead wire of the test light. If a voltmeter
is used instead of the test light, ground the grounding
side lead wire.
(2) Connect the other lead wire of the test light to the
power side terminal of the connector 0. The test
light should come on or the voltmeter should indicate
a voltage.
(3) Then, connect the test light or voltmeter to the
connector 0. The test light should not come on, or
the voltmeter should indicate no voltage. When the
switch is turned on in this state, the test light should
come on, or the voltmeter should indicate a voltage,
with the motor starting to run.
(4) The circuit illustrated here is normal but if there is any
problem such as the motor failing to run, check
voltages beginning at the connector nearest to the
motor unit the faulty part is identified.
2. CHECKING FOR A SHORT-CIRCUIT
Because the fuse has blown, it is probable that there is a
shot-t-circuited circuit. Follow the procedures below to
narrow down the short-circuit location.
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