NISSAN X-TRAIL 2003 Electronic Repair Manual

CAN SYSTEM (FOR A/T MODELS)
LAN-5
[CAN]
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CANSYSTEM(FORA/TMODELS)PFP:23710
System DescriptionEKS002AD
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
Component Parts and Harness Connector LocationEKS002AE
SKIA0980E

LAN-6
[CAN]
CANSYSTEM(FORA/TMODELS)
Wiring Diagram — CAN —
EKS002AF
TKWA0110E

CAN SYSTEM (FOR A/T MODELS)
LAN-7
[CAN]
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LAN
Work FlowEKS002AG
1. Print all the data of “SELF-DIAG RESULTS” and “DATA MONITOR” for “ENGINE” and “A/T” displayed on
CONSULT-II. Refer toEC-114, "
DTC U1000 CAN COMMUNICATION LINE"(WITH EURO-OBD) orEC-
460, "DTC U1000 CAN COMMUNICATION LINE"(WITHOUT EURO-OBD) for “ENGINE” and Refer to
AT-213, "
DTC U1000 CAN COMMUNICATION LINE"(EURO-OBD) orAT-443, "CAN CAMMUNICATION
LINE"(EXC.F/EURO-OBD) for “A/T”.
2. Attach the printed sheet of “SELF-DIAG RESULTS” and “DATA MONITOR” onto the check sheet. Refer to
LAN-8, "
CHECK SHEET"
3. Based on the data monitor results, put “v” marks onto the items with “UNKWN” or “NG” in the check sheet
table. Refer toLAN-8, "
CHECK SHEET"
NOTE:
If “NG” is displayed on “CAN COMM” for the diagnosed control unit, replace the control unit.
4. According to the check sheet results (example), start inspection. Refer toLAN-9, "
CHECK SHEET
RESULTS (EXAMPLE)"

LAN-8
[CAN]
CANSYSTEM(FORA/TMODELS)
CHECK SHEET
SKIA0886E

CAN SYSTEM (FOR A/T MODELS)
LAN-9
[CAN]
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LAN
CHECK SHEET RESULTS (EXAMPLE)
NOTE:
If “NG” is displayed on “CAN COMM” for the diagnosed control unit, replace the control unit.
INSPECTION
Proceed trouble diagnosis according to the check sheet results (example).
Case 1:Replace ECM.
Case 2:Replace TCM.
Case 3:Check CAN communication Circuit. Refer toLAN-9, "
CAN Communication Circuit Check"
CAN Communication Circuit CheckEKS002AH
1.CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Check following terminals and connector for damage, bend and loose connection. (control module-side
and harness-side)
lTCM.
lECM.
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.
2.CHECK HARNESS FOR SHORT CIRCUIT
1. Disconnect ECM connector and TCM connector.
2. Check continuity between ECM harness connector F43 termi-
nals 33 (B/W) and 34(L/R).
OK or NG
OK >> GO TO 3.
NG >> Repair harness between ECM and TCM.
SKIA0887E
33(B/W) – 34(L/R) : Continuity should not exist.
SKIA0888E

LAN-10
[CAN]
CANSYSTEM(FORA/TMODELS)
3.CHECK HARNESS FOR SHORT CIRCUIT
Check continuity between ECM harness connector F43 terminals
33(B/W), 34 (L/R) and ground.
OK or NG
OK >> GO TO 4.
NG >> Repair harness between ECM and TCM.
4.ECM/TCM INTERNAL CIRCUIT INSPECTION
Check components inspection. Refer toLAN-10, "
ECM/TCM INTERNAL CIRCUIT INSPECTION"
OK or NG
OK >> Reconnect all connectors to perform “SELF-DIAG RESULTS” and “DATA MONITOR” for
“ENGINE” and “A/T”. Refer toEC-114, "
DTC U1000 CAN COMMUNICATION LINE"(WITH
EURO-OBD) orEC-460, "
DTC U1000 CAN COMMUNICATION LINE"(WITHOUT EURO-OBD)
for “ENGINE” and Refer toAT-213, "
DTC U1000 CAN COMMUNICATION LINE"(EURO-OBD) or
AT-443, "
CAN CAMMUNICATION LINE"(EXC.F/EURO-OBD) for “A/T”.
NG >> Replace ECM and/or TCM.
Component InspectionEKS002AI
ECM/TCM INTERNAL CIRCUIT INSPECTION
lRemove ECM and TCM from vehicle.
lCheck resistance between ECM terminals 33 and 34.
lCheck resistance between TCM terminals 5 and 6.33(B/W) – ground : Continuity should not exist.
34(L/R) – ground : Continuity should not exist.
SKIA0889E
Unit Terminal Resistance value (W)
ECM 33–34
Approx. 108 - 132
TCM 5 – 6
PKIA0298E

CAN SYSTEM (FOR M/T MODELS)
LAN-11
[CAN]
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LAN
CANSYSTEM(FORM/TMODELS)PFP:23710
System DescriptionEKS002FK
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
Component Parts and Harness Connector LocationEKS002FL
SKIA0981E

LAN-12
[CAN]
CAN SYSTEM (FOR M/T MODELS)
Wiring Diagram — CAN —
EKS002FM
T K WA 0 111 E

CAN SYSTEM (FOR M/T MODELS)
LAN-13
[CAN]
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LAN
Work FlowEKS002FN
1. Print all the data of “SELF-DIAG RESULTS” and “DATA MONITOR” for “ENGINE”, “ALL MODE 4WD”,
and “ABS” displayed on CONSULT-II. Refer toEC-114, "
DTC U1000 CAN COMMUNICATION LINE"
(WITH EURO-OBD) orEC-460, "DTC U1000 CAN COMMUNICATION LINE"(WITHOUT EURO-OBD)
for“ENGINE”andRefertoTF-53, "
CAN COMMUNICATION SYSTEM"for “ALL MODE 4WD”. Refer to
BRC-108, "
Inspection 15 CAN Communication Circuit, ESP/TCS/ABS Control Unit and Steering Angle
Sensor"for “ABS”.
2. Attach the printed sheet of “SELF-DIAG RESULTS” and “DATA MONITOR” onto the check sheet. Refer to
LAN-14, "
CHECK SHEET"
3. Based on the data monitor results, put “v” marks onto the items with “UNKWN” or “NG” in the check sheet
table. Refer toLAN-14, "
CHECK SHEET"
NOTE:
If “NG” is displayed on “CAN COMM” for the diagnosed control unit, replace the control unit.
4. According to the check sheet results (example), start inspection. Refer toLAN-15, "
CHECK SHEET
RESULTS (EXAMPLE)"

LAN-14
[CAN]
CAN SYSTEM (FOR M/T MODELS)
CHECK SHEET
SKIA0925E