Infiniti G35 (V35) Sedan. Manual — part 837
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TROUBLE DIAGNOSIS
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< FUNCTION DIAGNOSIS >
[CAN FUNDAMENTAL]
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Example: Vehicle Display
How to Use CAN Communication Signal Chart
INFOID:0000000000963933
The CAN communication signal chart lists the signals needed for trouble diagnosis. It is useful for detecting
the root cause by finding a signal related to the symptom, and by checking transmission and reception unit.
Item
Result indi-
cated
Error counter
Description
CAN_COMM
(Initial diagnosis)
OK
0
Normal at present
NG
1 – 50
Control unit error
(The number indicates how many times diagnosis has been
run.)
CAN_CIRC_1
(Transmission diagnosis)
OK
0
Normal at present
UNKWN
1 – 50
Unable to transmit for 2 seconds or more at present.
(The number indicates how many times diagnosis has been
run.)
CAN_CIRC_2 – 9
(Reception diagnosis of each unit)
OK
0
Normal at present
UNKWN
1 – 50
Unable to transmit for 2 seconds or more at present.
(The number indicates how many times diagnosis has been
run.)
Diagnosis not performed.
No control unit for receiving signals. (No applicable optional
parts)
SKIB8715E
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< BASIC INSPECTION >
[CAN FUNDAMENTAL]
DIAGNOSIS AND REPAIR WORKFLOW
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Trouble Diagnosis Flow Chart
INFOID:0000000000963934
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
• What: Parts name, system name
• When: Date, Frequency
• Where: Road condition, Place
• In what condition: Driving condition/environment
• Result: Symptom
NOTE:
• Check normal units as well as error symptoms.
- Example: Circuit between ECM and the combination meter is judged normal if the customer indicates
tachometer functions normally.
• When a CAN communication system error is present, multiple control units may malfunction or go into fail-
safe mode.
JSMIA0016GB
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DIAGNOSIS AND REPAIR WORKFLOW
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< BASIC INSPECTION >
[CAN FUNDAMENTAL]
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• Indication of the combination meter is important to detect the root cause because it is the most obvious from
the customer, and it performs CAN communication with many units.
INSPECTION OF VEHICLE CONDITION
Check whether the symptom is reproduced or not.
NOTE:
Never turn the ignition switch OFF or disconnect the battery cable while the reproducing the error. The error
may temporarily correct itself, making it difficult to determine the root cause.
CHECK OF CAN SYSTEM TYPE (HOW TO USE CAN SYSTEM TYPE SPECIFICATION CHART)
Determine CAN system type based on vehicle equipment.
NOTE:
• This chart is used if CONSULT-III does not automatically recognize CAN system type.
• There are two styles for CAN system type specification charts. Depending on the number of available sys-
tem types, either style A or style B may be used.
CAN System Type Specification Chart (Style A)
NOTE:
SKIB8717E
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< BASIC INSPECTION >
[CAN FUNDAMENTAL]
DIAGNOSIS AND REPAIR WORKFLOW
CAN system type is easily checked with the vehicle equipment identification information shown in the chart.
CAN System Type Specification Chart (Style B)
NOTE:
JSMIA0017GB
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