Mitsubishi Eclipse. Manual — part 716

HOW TO USE TROUBLESHOOTING/ INSPECTION SERVICE POINTS

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GENERAL

00-7

4. DIAGNOSTIC TROUBLE CODE CHART
If the scan tool displays a diagnostic trouble code,
retrieve an applicable inspection procedure accord-
ing to this chart.

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5. SYMPTOM CHART
If there are symptoms, even though the results of
inspection using the scan tool show that all diagnos-
tic trouble codes are normal, inspection procedures
for each symptom will be found by using this chart.

.

6. DIAGNOSTIC TROUBLE CODE PROCEDURES
Indicates the inspection procedures corresponding to
each diagnostic trouble code.

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7. SYMPTOM PROCEDURES
Indicates the inspection procedures corresponding to
each symptoms classified in the Symptom Chart.

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8. SERVICE DATA REFERENCE TABLE
Inspection items and normal judgement values have
been provided in this chart as reference information.

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9. CHECK AT ECU TERMINALS
Terminal numbers for the ECU connectors, inspec-
tion items, and standard values have been provided
in this chart as reference information.

.

Terminal Voltage Checks
1. Connect a needle-nosed wire probe to a voltmeter

probe.

CAUTION

Short-circuiting the positive (+) probe between a
connector terminal and ground could damage
the vehicle wiring, the sensor, the ECU, or all
three. Use care to prevent this!
2. Insert the needle-nosed wire probe into each of

the ECU connector terminals from the wire side,
and measure the voltage while referring to the
check chart.
NOTE: Measure voltage with the ECU connectors
connected.
You may find it convenient to pull out the ECU to
make it easier to reach the connector terminals.

Checks don't have to be carried out in the order
given in the chart.

3. If voltage readings differ from normal condition

values, check related sensors, actuators, and
wiring, then replace or repair.

4. After repair or replacement, recheck with the

voltmeter to confirm that the repair has corrected
the problem.

.

Terminal Resistance and Continuity Checks
1. Turn the ignition switch to "LOCK" (OFF) position.
2. Disconnect the ECU connector.

CAUTION

If resistance and continuity checks are per-
formed on the wrong terminals, damage to the
vehicle wiring, sensors, ECU, and/or ohmmeter
may occur. Use care to prevent this!
3. Measure the resistance and check for continuity

between the terminals of the ECU harness-side
connector while referring to the check chart.
NOTE: Checks don't have to be carried out in the
order given in the chart.

4. If the ohmmeter shows any deviation from the

Normal Condition value, check the corresponding
sensor, actuator and related electrical wiring, then
repair or replace.

5. After repair or replacement, recheck with the

ohmmeter to confirm that the repair has corrected
the problem.

.

10. INSPECTION PROCEDURES USING AN
OSCILLOSCOPE
When there are inspection procedures using an
oscilloscope, these are listed here.

HOW TO USE THE INSPECTION
PROCEDURES

The causes of many of the problems occurring in
electric circuitry are generally the connectors, com-
ponents, the ECU, and the harnesses between con-
nectors, in that order. These inspection procedures
follow this order. They first try to discover a problem
with a connector or a defective component.

HOW TO USE TROUBLESHOOTING/ INSPECTION SERVICE POINTS

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GENERAL

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ACX00861AD

(1) Relevant circuit(s) of the component which
the DTC indicates are described.

(2) Shows the location of the connector(s) from
the circuit(s) above.

(3) Explains about the operation principle of the
component or its relevant parts in that circuit.

HOW TO USE TROUBLESHOOTING/ INSPECTION SERVICE POINTS

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GENERAL

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HARNESS INSPECTION
Check for an open or short circuit in the harness
between the terminals which were faulty according to
the connector measurements. Carry out this inspec-
tion while referring to GROUP 00E, Harness Con-
nector Inspection

P.00E-2

. Here, "Check harness

between power supply and terminal xx" also includes
checking for blown fuse. For inspection service
points when there is a blown fuse, refer to "Inspec-
tion Service Points for a Blown Fuse."

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MEASURES TO TAKE AFTER REPLACING THE
ECU
If the trouble symptoms have not disappeared even
after replacing the ECU, repeat the inspection proce-
dure from the beginning.

AC210616

(5) Explains about technical details.

(6) Describes the conditions for that DTC
being set (stored).

(8) Start of the diagnosis procedure
for that DTC.

(10) Provides the inspection procedure
for that DTC step by step.

(7) Describes possible
cause(s)for that DTC.

(9) Identifies the special tool(s)
necessary for diagnosing that DTC.

AB

HOW TO USE TROUBLESHOOTING/ INSPECTION SERVICE POINTS

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GENERAL

00-10

CONNECTOR MEASUREMENT SERVICE POINTS

Turn the ignition switch to the "LOCK" (OFF) position when
connecting and disconnecting the connectors. Turn the ignition
switch to "ON" when measuring if there are no instructions to
the contrary.

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IF INSPECTING WITH THE CONNECTOR CONNECTED

Required Special Tool:
MD998459: Test Harness

Waterproof Connectors

Be sure to use special tool, MB998459. Never insert a test
probe from the harness side, as this will reduce the water-
proof performance and result in corrosion.

Ordinary (non-waterproof) Connectors

Check by inserting the multi-meter test probe from the har-
ness side. Note that if the connector (control unit, etc.) is
too small to permit insertion of the test probe, it should not
be forced; use the backprobing tool for this purpose.

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IF INSPECTING WITH THE CONNECTOR DISCONNECTED

<When Inspecting a Female Pin>

• From front side of the connector

Required Special Tool:
MB991219:

Inspection Harness (Included in MB991223, Harness

Set)

The inspection harness for connector pin contact pressure

should be used. The test probe should never be forcibly
inserted, as it may cause a defective contact.

ACX00863 AB

MD998459

AC001606AB

CONNECTOR