NISSAN NAVARA 2005 Repair Workshop Manual

LAN-4
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PRECAUTIONS
lDo not perform bypass wire connections for the repair parts.
(The spliced wire will become separated and the characteristics
of twisted line will be lost.)
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TROUBLE DIAGNOSES WORK FLOWPFP:00004
When Displaying CAN Communication System ErrorsEKS00LBH
WHEN A MALFUNCTION IS DETECTED BY CAN COMMUNICATION SYSTEM
lCAN communication line is open. (CAN H, CAN L, or both)
lCAN communication line is shorted. (Ground, between CAN lines, or other harnesses)
lThe areas related to CAN communication of unit is malfunctioning.
WHEN A MALFUNCTION IS DETECTED EXCEPT CAN COMMUNICATION SYSTEM
lRemoval and installation of parts : When the units that perform CAN communication or the sensors
related to CAN communication are removed and installed, malfunction may be detected (or DTC other
than CAN communication may be detected).
lFuse blown out (removed): CAN communication of the unit may be stopped at such time.
lLow voltage : If the voltage decreases because of battery discharge when IGN is ON, malfunction may be
detected by self-diagnosis according to the units.

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TROUBLE DIAGNOSIS FLOW CHART
lSte p 1 : Refe r toLAN-7, "SELECTING CAN SYSTEM TYPE (HOW TO USE SPECIFICATION TABLE)".
lSte p 2 : Refe r toLAN-8, "ACQUISITION OF DATA BY CONSULT-II".
lSte p 3 : Refe r toLAN-9, "HOW TO USE CHECK SHEET TABLE".
lSte p 4 : Refe r toLAN-10, "Example of Filling in Check Sheet When Initial Conditions Are Reproduced".
lStep 5 : Check and repair according to system diagnosis.
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Diagnosis ProcedureEKS00LBI
SELECTING CAN SYSTEM TYPE (HOW TO USE SPECIFICATION TABLE)
Determine CAN system type from the equipment of the vehicle to select applicable check sheet.
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ACQUISITION OF DATA BY CONSULT-II
Attach the data acquired by CONSULT-II on the check sheet determined according to CAN system type.
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HOW TO USE CHECK SHEET TABLE
1. Unit names displayed on CONSULT-II
2. “No indication” : Put a check mark to it if the unit name described in step 1 is not displayed on “SELECT
SYSTEM” screen of CONSULT-II. (Unit communicating with CONSULT-II via CAN communication line)
“–” : Column not used (Unit communicating with CONSULT-II excluding CAN communication line)
3. “NG” : Display “NG” when malfunction is detected in the initial diagnosis of the diagnosed unit. Replace
the unit if “NG” is displayed.
“–” : Column not used (Initial diagnosis is not performed.)
4. “UNKWN” : Display “UNKWN” when the diagnosed unit does not transmit the data normally. Put a check
mark to it if “UNKWN” is displayed on CONSULT-II.
“–” : Column not used (Transmit diagnosis is not performed.)
5. “UNKWN” : Display “UNKWN” when the diagnosed unit does not receive the data normally. Put a check
mark to it if “UNKWN” is displayed on CONSULT-II.
“–” : Column not used (It is not necessary for CAN communication trouble diagnosis.)
NOTE:
CAN communication diagnosis checks if CAN communication works normally. (Contents of data are not diag-
nosed.)
lWhen the initial conditions are reproduced, refer toLAN-10, "Example of Filling in Check Sheet When Ini-
tial Conditions Are Reproduced".
lWhen the initial conditions are not reproduced, refer toLAN-13, "Example of Filling in Check Sheet When
Initial Conditions Are Not Reproduced".
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LAN-10
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Example of Filling in Check Sheet When Initial Conditions Are Reproduced
1. Put a check mark to “No indication” if some of unit names listed on the column of diagnosis system selec-
tion screen of a check sheet table are not displayed on “SELECT SYSTEM” screen attached to the check
sheet.
NOTE:
Put a check mark to “No indication” of METER because METER is not displayed on “SELECT SYSTEM”
screen.
2. Confirm the unit name that “UNKWN” is displayed from the copy of “CAN DIAG SUPPORT MNTR” screen
of “ENGINE” attached to the check sheet, and then put a check mark to the check sheet table.
NOTE:
In “CAN DIAG SUPPORT MNTR” screen, “UNKWN” is displayed on “METER/M&A”. Put a check mark to
it.
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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”, “HVAC”, “BCM”, “ABS” and “IPDM E/R” as well as “ENGINE”. And then, put a check mark to the
check sheet table.
NOTE:
lFor “A/T”, “UNKWN” is displayed on “METER/M&A”, “ICC/e4WD” and “AWD/4WD”. But put a check
mark to “METER/M&A” because “UNKWN” is listed on the column of reception diagnosis of the check
sheet table.
lFor “HVAC”, “UNKWN” is not displayed. Do not put a check mark to it.
lFor “BCM”, “UNKWN” is displayed on “METER/M&A” and “I-KEY”. But put a check mark to “METER/
M&A” because “UNKWN” is listed on the column of reception diagnosis of the check sheet table.
lFor “ABS”, “UNKWN” is not displayed. Do not put a check mark to it.
lFor “IPDM E/R”, “UNKWN” is not displayed. Do not put a check mark to it.
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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 toLAN-30, "
CAN Communica-
tion Unit".
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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” or “CAN
COMM CIRCUIT [U1000]” is displayed, put a check mark to the applicable column of self-diagnostic
results of the check sheet table.
NOTE:
lFor “ENGINE”, “CAN COMM CIRCUIT [U1000]” is displayed. Put a check mark to it.
lFor “A/T”, “CAN COMM CIRCUIT [U1000]” is displayed. Put a check mark to it.
lFor “HVAC”, “NO DTC IS DETECTED” is displayed. Do not put a check mark to it.
lFor “BCM”, “NO DTC IS DETECTED” is displayed. Do not put a check mark to it.
lFor “METER”, “CAN COMM CIRCUIT [U1000]” is displayed. Put a check mark to it.
lFor “ABS”, “NO DTC IS DETECTED” is displayed. Do not put a check mark to it.
lFor “IPDM E/R”, “NO DTC IS DETECTED” is displayed. Do not put a check mark to it.
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