Mitsubishi Evolution X. Manual - part 328

ACX00912

HARNESS CONNECTOR INSPECTION

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GENERAL <ELECTRICAL>

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3. Press the contact point to the male 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

ACX00913AB

WATERPROOF
CAP

1. Remove the waterproof cap.

AC310304AB

TERMINAL LANCE

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.

AC310313

CAUTION

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

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

HOW TO DIAGNOSE

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GENERAL <ELECTRICAL>

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HOW TO DIAGNOSE

HOW TO DIAGNOSE

M1001004300086

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

M1001004400049

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.

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

INFORMATION FOR DIAGNOSIS

M1001004500132

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 current flow when the switch is operated and 
how the component reacts.

HOW TO DIAGNOSE

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GENERAL <ELECTRICAL>

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4. Troubleshooting hints include numerous 

examples of problems which might occur, 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 group which includes details of these components.

INSPECTION

M1001004600139

ACX00936 AB

CLICK

1. Sight and sound checks

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

ACX00937

2. Simple checks

For example, if a headlight does not come on and 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.

ACX00938AB

SELECTOR KNOB

POINTER

3. Checking with instruments

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

INSPECTION INSTRUMENTS

M1001004700040

For inspection, use the following instruments:

HOW TO DIAGNOSE

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CAUTION

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

ACX00939

1. Test light

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

ACX00940

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.

ACX00941

CAUTION

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

A jumper wire is used to close an open circuit. 

ACX00942AB

RED LEAD WIRE

POWER LINE

BLACK LEAD WIRE

GROUND

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 before or after a component.