Operation Section
-95-
Basic Troubleshooting(LP/DF)
Trouble Diagnosis flow chart
There are many different malfunction symptoms. So there is no perfect trouble diagnosis technique applicable
to all malfunctions. Experience is also important to achieving an accurate trouble diagnosis.
Nonetheless, an accurate trouble diagnosis can be performed by applying similar procedures, regardless of
the malfunction symptom. Perform trouble diagnosis following the flow chart shown below.
Diagnosis
Use the diagnosis sheet.
No malfunction symptoms
Symptom check
Malfunction symptoms
No malfunction symptoms
Self-diagnosis
Malfunction indicatio
CONFIRMATION DRIVING CON-
DITION BY FREEZE FRAME DATA
CHECK MALFUNCTION INDICATION
SYSTEM
REPAIR/REPLACE
REPAIR/REPLAC
Symptom check
NG
OK
BASIC
INSPECTION
No
malfunction
malfunction
SELF-DIAGNOSIS (Erase the self-diagnostic results.)
EXPLAIN CUSTOMER REPAIR/REPLACE PROCESS (END)
Symptom check
REPAIR/REPLACE
REPAIR/REPLAC
BASIC
INSPECTION
No malfunction
indication
Malfunction indication
Self-diagnosis
Malfunction
No Malfunction
REPAIR/REPLACE
Symptom check
NG
OK
CONFIRMATION DRIVING CONDITION
BY FREEZE FRAME DATA
CHECK MALFUNCTION INDICATION
SYSTEM
No Malfunction BASIC
INSPECTION
Malfunction
NG
OK
OK
NG
No reproduce
Reproduce
ESTIMATION OF POSSIBLE CAUSE
(Refer to “Diagnosis Chart by Symptom”)
INVESTIGATION OF POSSIBLE CAUSE
(using ACTIVE TEST or oscilloscope)
REPAIR/REPLACE
CHECK MALFUNCITON INDICATION SYSTEM
(Refer to “Diagnosis Chart by Symptom”)
REPRODUCE
THE SYMPTOMS
• ACTIVE TEST
• DATA MONITOR
• Apply vibration or heat.
REPRODUCE
THE SYMPTOMS
Use the same method to
confirm that the reproduced
symptom has been repaired.
EXPLAIN CUSTOMER
REPAIR/REPLACE PROCESS
SELF-DIAGNOSIS
(Erase the self-diagnostic results)
SELF-DIAGNOSIS
(Erase the self-diagnostic results)
EXPLAIN CUSTOMER
REPAIR/REPLACE PROCESS(END)
Note: Repair malfunctioning
parts found during inspection
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