Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 2
HOW TO USE THIS MANUAL
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GENERAL <BODY AND CHASSIS>
00-5
ACX00860
AC
(continued)
.
TROUBLESHOOTING GUIDELINES
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GENERAL <BODY AND CHASSIS>
00-6
TR O U B LESH O O TIN G G U ID ELIN ES
M1001008800102
VERIFY THE COMPLAINT
•
Make sure the customer's complaint and the
service writer's work order description are
understood before starting work.
•
Make sure the correct operation of the system is
understood. Read the service manual description
to verify any aspect of normal system operation.
•
Operate the system to see the symptoms. Look
for other symptoms that were not reported by the
customer, or on the work order, that may be
related to the problem.
DETERMINE POSSIBLE CAUSES
Compare the confirmed symptoms to the diagnostic
symptom indexes to get to the right diagnosis
procedure.
If the confirmed symptoms can not be found on any
symptom index, determine other possible causes.
•
Analyze the system diagrams and list all possible
causes for the problem symptoms.
•
Rank all these possible causes in order of
probability, based on how much of the system
they cover, how likely they are to be the cause,
and how easy they will be to check. Be sure to
take experience into account. Consider the
causes of similar problems seen in the past. The
list of causes should be ranked in order from
general to specific, from most-likely to least-likely,
and from easy-to-check to hard-to-check.
FIND THE PROBLEM
After the symptoms have been confirmed, and
probable causes have been identified, the next step
is to make step-by-step checks of the suspected
system components, junctions, and links in logical
order.
Use the diagnostic procedures in the service manual
whenever possible. Follow these procedures
carefully to avoid missing an important step in the
diagnosis sequence. It might be the skipped step that
leads to the solution of the problem.
If the service manual doesn't have step-by-step
procedures to help diagnose the problem, come up
with a series of checks based on the ranked list of
probable causes. Troubleshooting checks should be
made in the order that the list of causes was ranked:
•
general to specific
•
most-likely to least-likely
•
easy-to-check to hard-to-check
REPAIR THE PROBLEM
When the step-by-step troubleshooting checks find a
fault, perform the proper repairs. Make sure to fix the
root cause of the problem, not just the symptom. Just
fixing the symptom, without fixing the root cause, will
cause the symptom to eventually return.
VERIFY THE REPAIR
After repairs are made, recheck the operation of the
system to confirm that the problem is eliminated.
Make sure to check the system thoroughly.
Sometimes new problems are revealed after repairs
have been made.
H O W TO U SE TR O U B LESH O O TIN G /IN SPEC TIO N SERVIC E
PO IN TS
M1001000200098
Troubleshooting of electronic control systems for
which the scan tool can be used follows the basic
outline described below. Even in systems for which
the scan tool cannot be used, part of these systems
still follow this outline.
TROUBLESHOOTING CONTENTS
1. STANDARD FLOW OF DIAGNOSTIC
TROUBLESHOOTING
Troubleshooting strategy are shown.
2. SYSTEM OPERATION AND SYMPTOM
VERIFICATION TESTS
If verification of the symptoms is difficult, procedures
for checking operation and verifying symptoms are
shown.
3. DIAGNOSTIC FUNCTION
The following trouble code diagnosis are shown.
•
How to read diagnostic trouble codes
•
How to erase diagnostic trouble codes
•
Input inspection service points
HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS
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GENERAL <BODY AND CHASSIS>
00-7
4. DIAGNOSTIC TROUBLE CODE CHART
5. SYMPTOM CHART
If there are symptoms, even though the results of
inspection using the scan tool show that all
diagnostic 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. (Refer to
7. SYMPTOM PROCEDURES
Indicates the inspection procedures corresponding to
each symptoms classified in the Symptom Chart.
(Refer to
.)
8. SERVICE DATA REFERENCE TABLE
Inspection items and normal judgement values have
been provided in this chart as reference information.
9. CHECK AT ECU TERMINALS
Terminal numbers for the ECU connectors,
inspection 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
performed 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 problems occurring in electric
circuitry are generally the connectors, components,
the ECU and the harnesses between connectors, 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 <BODY AND CHASSIS>
00-8
ACX00861AC
(1) Relevanta circuit(s) of the component which
the DTC indicates are described.
(2) Shows the position of the connector(s) which
are referred to in the above circuit(s).
(3) Explains about the operation principle of the
component or its relevant parts in that circuit.
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