Mitsubishi Montero 1987 Service Manual download pdf (Page 38)

WIRING HARNESS

- Troubleshooting

1660236

Power

supply

Fuse

/----

Motor

1660239

CHECKING CABLES AND WIRES

1. Check connections for looseness, rust and stains.

2. Check terminals and wires for corrosion by battery electrolyte,

$tc.

3. Check terminals and wires for open circuit or impending open

circuit.

4. Check wire insulation and coating for damage, cracks and de-

grading.

5. Check conductive parts of terminals for contact with other

metallic parts (vehicle body and other parts).

6. Check grounding parts to verify that there is complete conti-

nuity between attaching bolt(s) and vehicle body.

7. Check for incorrect wiring.

8. Check that wirings are so clamped as to ‘prevent contact with

sharp corners of the vehicle body, etc. or hot parts (exhaust

manifold, pipe, etc.).

9. Check that wirings are clamped firmly to secure enough clear-

ance 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 allowance for vibrations.

HANDLING ON-VEHICLE BAlTERY

When checking or servicing does not require power from the on-

vehicle battery, be sure to disconnect the cable from the battery

(-)terminal. This is to prevent problems that could be caused by

shorting of the circuit. Disconnect the (-) terminal first and recon-

nect it last.

TROUBLESHOOTING

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

(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 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 (3,. 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.

1 ST6 Revision

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Mitsubishi Montero 1987 Service Manual Page 38

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