Mitsubishi MOTORS Eclipse 1997, Service Manual

Page: 12 / 540

GENERAL How to Diagnose
Power supply
Motor
CABLES AND WIRES CHECK
1. Check connections for looseness, rust and stains.
2. and wires for corrosion by battery electro-
lyte, etc.
3. Check terminals and wires for open circuit or impending
open circuit.
4. Check wire insulation and coating for damage, cracks
and degrading.
5. Check parts of terminals for contact other
metallic parts (vehicle body and other
6. Check grounding parts to verify that there is complete
continuity between attaching bolt(s) and vehicle body.
7. Check for incorrect wiring.
8. Check that wirings are clamped to prevent contact with
sharp corners of the vehicle body, etc. or hot parts (exhaust
manifold, pipe, etc.).
9. Check that wirings are clamped to secure enough
clearance from the fan pulley, fan belt, and other rotating
or moving parts.
10. Check that the wirings between the fixed parts such as
the vehicle body and the vibrating’ parts such as the engine
are made with adequate
for vibrations.
BATTERY HANDLING
When checking or servicing does not require ‘power
the on-vehicle battery, be sure to disconnect the cable from
the battery
terminal. This is to prevent problems that
could be caused by a short circuit. Disconnect the terminal
first and reconnect it last.
GENERAL ELECTRICAL SYSTEM CHECK
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, short-circuit check,
and continuity check.
Each of these methods is briefly
described in the following:
1. VOLTAGE CHECK
(1) 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 switch connector. The
test light should come on or the voltmeter should
indicate a voltage.
(3) Then, connect the test light or to the motor
connector.
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 motor starting to run.
(4) The circuit illustrated here is normal. If there is any
problem, such as the motor failing to run, check volt-
ages beginning at the connector nearest to the motor
until the faulty’ part is identified.
TSB