Mitsubishi Galant. Manual — part 2
HOW TO USE THIS MANUAL
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GENERAL <BODY AND CHASSIS>
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NOTES
HOW TO USE THIS MANUAL
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GENERAL <BODY AND CHASSIS>
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AC004952
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HOW TO USE THIS MANUAL
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GENERAL <BODY AND CHASSIS>
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TROUBLESHOOTING GUIDELINES
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GENERAL <BODY AND CHASSIS>
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TR O U B LESH O O TIN G G U ID ELIN ES
M1001008800124
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 does not 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
M1001000200117
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
4. DIAGNOSTIC TROUBLE CODE CHART
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