Mitsubishi Montero (2002-2004). Manual — part 198

HARNESS CONNECTOR INSPECTION

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GENERAL <ELECTRICAL>

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3. Press the contact point of the female terminal down by

holding a screwdriver [1.4 mm (0.06 inch) width] as shown in
the figure. Lightly squeeze the outer edge so the flats are
parallel with the bottom.

.

INJECTOR CONNECTOR
1. Remove the waterproof cap.

2. Insert the tip of a screwdriver [1.4 mm (0.06 inch) width] into

the connector as shown in the figure, press in the terminal
lance, and pull out the terminal.

CAUTION

Make sure the lance is pressed in before the terminal is
inserted into the connector.
3. Press the contact point of the male terminal down by holding

a screwdriver [1.4 mm (0.06 inch) width] as shown in the
figure.

ACX00912

ACX00913AB

WATERPROOF
CAP

ACX00914AB

TERMINAL LANCE

HOW TO DIAGNOSE

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HOW TO DIAGNOSE

HOW TO DIAGNOSE

M1001004300202

The most important point in troubleshooting is to
determine "Probable Cause." Once the probable
causes are determined, parts to be checked can be
limited to those associated with such probable
causes. The determination of the probable causes
must be based on a theory and be supported by facts
and must not be based on intuition only.

TROUBLESHOOTING STEPS

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If an attempt is made to solve a problem without going through correct steps for troubleshooting, the symp-
toms could become more complicated, resulting in failure to determine the causes correctly and making
incorrect repairs. The four steps below should be followed in troubleshooting.

INFORMATION FOR DIAGNOSIS

M1001004500110

This manual contains the harness diagrams as well as the individual circuit drawings, operational explana-
tions, and troubleshooting hints for each component. The information is presented in the following manner:
1. Connector diagrams show the connector

positions, etc., on the actual vehicle as well as the
harness path.

2. Circuit diagrams show the configuration of the

circuit with all switches in their normal positions.

3. Operational explanations include circuit drawings

of voltage flow when the switch is operated and
how the component reacts.

ACX00915

3

Checking of Parts Associated with
Probable Causes and Determination
of Faulty Parts

2 Determination of Probable Causes

4 Repair and Confirmation

Observe the symptom carefully. Check if there are also
other problems.

In determining the probable causes, it is necessary to
study the wiring diagram to understand the circuit as a
system. Knowledge of switches, relays and other parts is
necessary for accurate analysis. The causes of similar
problems in the past must be taken into account.

Troubleshooting is carried out by making step-by-step
checks until the cause is found.

After the problems are corrected, be sure to check that the
system operates correctly. Also check that new problems
have not been caused by the repair.

AC

1 Observation of Problem Symptoms

HOW TO DIAGNOSE

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4. Troubleshooting hints include numerous

examples of problems which might occur. Most of
the problems can be traced backward in a
common-sense manner to the origin of the
trouble. Problems whose origins may not be found
in this manner are pursued through the various
system circuits.

NOTE: Components of MFI, ETACS, etc. with ECU do not include 3 and 4 above. For this information, refer
to a relevant service manual section that includes details of these components.

INSPECTION

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1. Sight and sound checks

Check relay operation, blower motor rotation, light
illumination, etc. Listen for a "click" when relay covers are
pushed down.

2. Simple checks

For example, if a headlight does not come on, a faulty fuse
or poor grounding is suspected. Replace the fuse with a new
one. Or use a jumper wire to ground the light to the body.
Determine which part(s) is/are responsible for the problem.

3. Checking with instruments

Use an appropriate instrument in an adequate range and
read the indication correctly.

ACX00936 AB

CLICK

ACX00937

ACX00938AB

SELECTOR KNOB

POINTER

HOW TO DIAGNOSE

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INSPECTION INSTRUMENTS

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For inspection, use the following instruments:
1. Test lights

A test light consists of a 12V bulb and lead wires. It is used
to check voltages or short circuits.

CAUTION

Never use a test light for checking ECU-related circuits or
ECUs.

2. Self-powered test light

A self-powered test light consists of a bulb, battery and lead
wires connected in series. It is used to check continuity or
grounding.

3. Jumper wire

A jumper wire is used to close an open circuit.

CAUTION

Never use a jumper wire to connect a power supply
directly to a load.

4. Voltmeter

A voltmeter is used to measure the circuit voltage. Normally,
the positive (red lead) probe is applied to the point of voltage
measurement and the negative (black lead) probe to the
body ground. Use a digital voltmeter to check for voltage
drop upstream and downstream of a component.

ACX00939

ACX00940

ACX00941

ACX00942AB

RED LEAD WIRE

POWER LINE

BLACK LEAD WIRE

GROUND