Infiniti M35/M45 Y50. Manual — part 842
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TROUBLE DIAGNOSES WORK FLOW
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[CAN FUNDAMENTAL]
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Trouble Diagnosis Procedure
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INTERVIEW WITH CUSTOMER
Interview with the customer is important to detect the root cause of CAN communication system errors and to
understand vehicle condition and symptoms for proper trouble diagnosis.
Points in interview
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What: Parts name, system name
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When: Date, Frequency
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Where: Road condition, Place
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In what condition: Driving condition/environment
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Result: Symptom
NOTE:
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Check normal units as well as error symptoms.
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Example: Circuit between ECM and the combination meter is judged normal if the customer indicates
tachometer functions normally.
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When a CAN communication system error is present, multiple control units may malfunction or go into fail-
safe mode.
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Indication of the combination meter is important to detect the root cause because it is the most obvious to
the customer, and it performs CAN communication with many units.
SKIB8717E
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TROUBLE DIAGNOSES WORK FLOW
INSPECTION OF VEHICLE CONDITION
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Check whether or not “U1000” or “U1001” is indicated on “SELF-DIAG RESULTS” by CONSULT-II.
NOTE:
Root cause cannot be detected using the procedure in this section if “U1000” or “U1001” is not indicated.
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Check whether the symptom is reproduced or not.
NOTE:
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Do not turn the ignition switch OFF or disconnect the battery cable while reproducing the error. The
error may temporarily correct itself, making it difficult to determine the root cause.
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The procedures for present errors differ from the procedures for past errors. Refer to
.
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TROUBLE DIAGNOSES WORK FLOW
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CHECK OF CAN SYSTEM TYPE (HOW TO USE CAN SYSTEM TYPE SPECIFICATION CHART)
Determine CAN system type based on vehicle equipment. Then choose the correct diagnosis sheet.
NOTE:
There are two styles for CAN system type specification charts. Depending on the number of available system
types, either style A or style B may be used.
CAN System Type Specification Chart (Style A)
NOTE:
CAN system type is easily checked with the vehicle equipment identification information shown in the chart.
SKIB8888E
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CAN System Type Specification Chart (Style B)
NOTE:
CAN system type is easily checked with the vehicle equipment identification information shown in the chart.
SKIB8889E
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