Infiniti Q45. Manual - part 644

TROUBLE DIAGNOSES WORK FLOW

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3.

Confirm the unit name that “UNKWN” is displayed on the copy of “CAN DIAG SUPPORT MNTR” screen
of “A/T”, “VDC” and “ICC” as well as “ENGINE”. And then, put a check mark to the check sheet table.

NOTE:

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For “A/T”, “UNKWN” is displayed on “METER/M&A” and “AWD/4WD”. But put a check mark only to
“METER/M&A” because “UNKWN” is listed on the column of reception diagnosis on the check sheet
table.

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For “VDC”, “UNKWN” is displayed on “METER/M&A” and “STRG”. Put check mark to them.

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For “ICC”, “UNKWN” is displayed on “METER/M&A”, “LANE KEEP”, “STRG”, “LANE DETECTOR”,
“TCM(l)” and “BCM/SEC”. But put a check mark only to “METER/M&A” because “UNKWN” is listed on
the column of reception diagnosis on the check sheet table.

SKIB6957E

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TROUBLE DIAGNOSES WORK FLOW

NOTE:
There is a case that some of “CAN DIAG SUPPORT MNTR” and “SELF-DIAG RESULTS” are not needed for
diagnosis. In the case, “UNKWN” and “CAN COMM CIRCUIT [U1000]” in “Check sheet results (example)”
change to “–”. Then, ignore check marks on the check sheet table.

4.

Perform system diagnosis for possible causes identified.

5.

Perform diagnosis again after inspection and repair. Make sure that repair is completely performed, and
then end the procedure.

Start CAN system trouble diagnosis if this procedure can be confirmed. Refer to 

LAN-40, "CAN Communica-

tion Unit"

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TROUBLE DIAGNOSES WORK FLOW

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Example of Filling in Check Sheet When Initial Conditions Are Not Reproduced

1.

See “SELF-DIAG RESULTS” of all units attached to the check sheet. If “CAN COMM CIRCUIT”, “CAN
COMM CIRCUIT [U1000]” or “CAN COMM CIRCUIT [U1001]” is displayed, put a check mark to the appli-
cable column of self-diagnostic results of the check sheet table.

NOTE:

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For “ENGINE”, “CAN COMM CIRCUIT [U1001]” is displayed. Put a check mark to it.

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For “A/T”, “CAN COMM CIRCUIT [U1000]” is displayed. Put a check mark to it.

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For “VDC”, “NO DTC IS DETECTED” is displayed. Do not put a check mark to it.

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For “ICC”, “NO DTC IS DETECTED” is displayed. Do not put a check mark to it.

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For “PRECRASH SEATBELT”, “CAN COMM CIRCUIT [U1000]” is displayed. Put a check mark to it.

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For “LDW”, “NO DTC IS DETECTED” is displayed. Do not put a check mark to it.

SKIB6959E

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TROUBLE DIAGNOSES WORK FLOW

NOTE:
There is a case that some of “CAN DIAG SUPPORT MNTR” and “SELF-DIAG RESULTS” are not needed for
diagnosis. In the case, “UNKWN” and “CAN COMM CIRCUIT [U1000]” in “Check sheet results (example)”
change to “–”. Then, ignore check marks on the check sheet table.

2.

For the selected possible causes, it is expected that malfunctions have been found in the past.

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