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LAN-3
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CAN COMMUNICATIONPFP:23710
System DescriptionEKS001U3
CAN (Controller Area Network) is a serial communication line for real time application. I NISSAN X-TRAIL 2001 Service Repair Manual CAN COMMUNICATION
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System DescriptionEKS001U3
CAN (Controller Area Network) is a serial communication line for real time application. I](/manual-img/5/57405/w960_57405-3664.png)
CAN COMMUNICATION
LAN-3
[CAN]
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CAN COMMUNICATIONPFP:23710
System DescriptionEKS001U3
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.
FOR A/T MODELS
System diagram
Input/output signal chart
T: Transmit R: Receive
FOR M/T MODELS
System diagram
Input/output signal chart
T: Transmit R: Receive
SKIA0884E
Signals ECM TCM
Engine coolant temperature signal T R
Accelerator pedal position signal T R
A/T self-diagnosis signal R T
SKIA0885E
Signals ECMSteering wheel
angle sensor4WD control unitESP/ TCS / ABS
control unit
Engine speed signal T R R
Accelerator pedal position signal T R
ESP operation signal R R T
TCS operation signal R R T
ABS operation signal R R T
Stop lamp switch signalRT
Steering wheel angle sensor signal T R
ESP-OFF switch signalRT
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LAN-4
[CAN]
CAN COMMUNICATION
Wheel speed sensor signalRT
4WD mode signalTR Signals ECMSteering wheel
angle sensor4WD control unitESP/ TCS / ABS
control unit
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CAN SYSTEM (FOR A/T MODELS)
LAN-5
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CAN SYSTEM (FOR A/T MODELS)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
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LAN-6
[CAN]
CAN SYSTEM (FOR A/T MODELS)
Wiring Diagram — CAN —
EKS002AF
TKWA0728E
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Work FlowEKS002AG
1. Print all the data of “SELF-DIAG RESULTS” and “DATA MONITOR” for “ENGINE” and “A/T” displayed on NISSAN X-TRAIL 2001 Service Repair Manual CAN SYSTEM (FOR A/T MODELS)
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Work FlowEKS002AG
1. Print all the data of “SELF-DIAG RESULTS” and “DATA MONITOR” for “ENGINE” and “A/T” displayed on](/manual-img/5/57405/w960_57405-3668.png)
CAN SYSTEM (FOR A/T MODELS)
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Work FlowEKS002AG
1. Print all the data of “SELF-DIAG RESULTS” and “DATA MONITOR” for “ENGINE” and “A/T” displayed on
CONSULT-II. Refer to the following:
●EC-854, "DTC U1000 CAN COMMUNICATION LINE" (QR20 WITH EURO-OBD) for “ENGINE”
●EC-1199, "DTC U1000 CAN COMMUNICATION LINE" (QR20 WITHOUT EURO-OBD) for “ENGINE”
●EC-122, "DTC U1000 CAN COMMUNICATION LINE" (QR25 WITH EURO-OBD) for “ENGINE”
●EC-513, "DTC U1000 CAN COMMUNICATION LINE" (QR25 WITHOUT EURO-OBD) for “ENGINE”
●AT-190, "DTC U1000 CAN COMMUNICATION LINE" (EURO-OBD) for “A/T”
●AT-403, "CAN COMMUNICATION LINE" (ALL) 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 to LAN-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 to LAN-9, "
CHECK SHEET
RESULTS (EXAMPLE)" .
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LAN-8
[CAN]
CAN SYSTEM (FOR A/T MODELS)
CHECK SHEET
SKIA0886E
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CHECK SHEET RESULTS (EXAMPLE)
INSPECTION
Proceed trouble diagnosis according to the check sheet results (example).
Case 1:Replace ECM NISSAN X-TRAIL 2001 Service Repair Manual CAN SYSTEM (FOR A/T MODELS)
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CHECK SHEET RESULTS (EXAMPLE)
INSPECTION
Proceed trouble diagnosis according to the check sheet results (example).
Case 1:Replace ECM](/manual-img/5/57405/w960_57405-3670.png)
CAN SYSTEM (FOR A/T MODELS)
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CHECK SHEET RESULTS (EXAMPLE)
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 to LAN-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).
●TCM.
●ECM.
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 the following.
●QR20DE engine models:
Continuity between ECM harness connector F43 terminals 33
(B/W) and 34 (L/R).
●QR25DE engine models:
Continuity between ECM harness connector F43 terminals 33
(W/B) 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)
(QR20DE engine models): Continuity should not
exist.
33 (W/B) – 34 (L/R)
(QR25DE engine models): Continuity should not
exist.
SKIA0888E
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![NISSAN X-TRAIL 2001 Service Repair Manual LAN-10
[CAN]
CAN SYSTEM (FOR A/T MODELS)
3. CHECK HARNESS FOR SHORT CIRCUIT
1. Check the following.
●QR20DE engine models:
Continuity between ECM harness connector F43 terminals 33
(B/W), 34 NISSAN X-TRAIL 2001 Service Repair Manual LAN-10
[CAN]
CAN SYSTEM (FOR A/T MODELS)
3. CHECK HARNESS FOR SHORT CIRCUIT
1. Check the following.
●QR20DE engine models:
Continuity between ECM harness connector F43 terminals 33
(B/W), 34](/manual-img/5/57405/w960_57405-3671.png)
LAN-10
[CAN]
CAN SYSTEM (FOR A/T MODELS)
3. CHECK HARNESS FOR SHORT CIRCUIT
1. Check the following.
●QR20DE engine models:
Continuity between ECM harness connector F43 terminals 33
(B/W), 34 (L/R) and ground.
●QR25DE engine models:
Continuity between ECM harness connector F43 terminals 33
(W/B), 34 (L/R) and ground.
OK or NG
OK >> GO TO 4.
NG >> Repair harness between ECM and TCM.
4. CHECK HARNESS FOR OPEN CIRCUIT
1. Check the following.
●QR20DE engine models:
Continuity between ECM harness connector F43 terminals 33
(B/W), 34 (L/R) and TCM harness connector F46 terminals 5 (B/
W), 6 (L/R).
●QR25DE engine models:
Continuity between ECM harness connector F43 terminals 33
(W/B), 34 (L/R) and TCM harness connector F46 terminals 5
(W/B), 6 (L/R).
OK or NG
OK >> GO TO 5.
NG >> Repair harness.33 (B/W) – ground
(QR20DE engine models): Continuity should not
exist.
34 (L/R) – ground
(QR20DE engine models): Continuity should not
exist.
33 (W/B) – ground
(QR25DE engine models): Continuity should not
exist.
34 (L/R) – ground
(QR25DE engine models): Continuity should not
exist.
SKIA0889E
33 (B/W) – 5 (B/W)
(QR20DE engine models): Continuity should exist.
34 (L/R) – 6 (L/R)
(QR20DE engine models): Continuity should exist.
33 (W/B) – 5 (W/B)
(QR25DE engine models): Continuity should exist.
34 (L/R) – 6 (L/R)
(QR25DE engine models): Continuity should exist.
SKIA3969E