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POWER SUPPLY CIRCUIT FOR ECM
EC-1443
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Wiring DiagramEBS0036A
TBWA0101E
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![NISSAN X-TRAIL 2001 Service Repair Manual EC-1444
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POWER SUPPLY CIRCUIT FOR ECM
Diagnostic Procedure
EBS0036B
1. INSPECTION START
Start engine.
Is engine running?
Ye s o r N o
Yes >> GO TO 6.
No >> GO TO 2.
2. CHECK ECM POWER SUPPLY C NISSAN X-TRAIL 2001 Service Repair Manual EC-1444
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POWER SUPPLY CIRCUIT FOR ECM
Diagnostic Procedure
EBS0036B
1. INSPECTION START
Start engine.
Is engine running?
Ye s o r N o
Yes >> GO TO 6.
No >> GO TO 2.
2. CHECK ECM POWER SUPPLY C](/manual-img/5/57405/w960_57405-1793.png)
EC-1444
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POWER SUPPLY CIRCUIT FOR ECM
Diagnostic Procedure
EBS0036B
1. INSPECTION START
Start engine.
Is engine running?
Ye s o r N o
Yes >> GO TO 6.
No >> GO TO 2.
2. CHECK ECM POWER SUPPLY CIRCUIT-I
1. Turn ignition switch “ON”.
2. Check voltage between ECM terminals D18, D19 and ground
with CONSULT-II or tester.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3. DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors M63, F30
●Fuse block (J/B) connector M1
●10A fuse
●Harness for open or short between ECM and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminals A5, A6, A7 and engine ground. Refer to Wiring Dia-
gram.
4. Also check harness for short to power.
OK or NG
OK >> GO TO 5.
NG >> Repair open circuit or short to power in harness or connectors. Voltage: Battery voltage
PBIB0356E
Continuity should exist.
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POWER SUPPLY CIRCUIT FOR ECM
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5.CHECK ECM POWER SUPPLY CIRCUIT-II
1. Reconnect ECM harness connector.
2. Turn ignition switch “ON” and then “OFF”.
3. Check voltage between ECM terminals A8, A9 and ground with
CONSULT-II or tester.
OK or NG
OK >> Check EDU power supply circuit. Refer to EC-1505,
"Diagnostic Procedure" .
NG >> GO TO 6.
6.CHECK ECM POWER SUPPLY CIRCUIT-III
1. Disconnect ECM relay.
2. Check voltage between relay terminals 1, 6 and ground with
CONSULT-II or tester.
OK or NG
OK >> GO TO 8.
NG >> GO TO 7.
7.DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors E65, F6
●20A fuse
●Harness for open or short between ECM relay and battery
>> Repair open circuit or short to ground or short to power in harness or connectors. Voltage: After turning ignition switch "OFF", battery
voltage will exist for a few seconds, then
drop to approximately 0V.
PBIB0357E
PBIB0377E
Voltage: Battery voltage
PBIB0359E
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![NISSAN X-TRAIL 2001 Service Repair Manual EC-1446
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POWER SUPPLY CIRCUIT FOR ECM
8. CHECK OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminals D24, D26 and NISSAN X-TRAIL 2001 Service Repair Manual EC-1446
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POWER SUPPLY CIRCUIT FOR ECM
8. CHECK OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminals D24, D26 and](/manual-img/5/57405/w960_57405-1795.png)
EC-1446
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POWER SUPPLY CIRCUIT FOR ECM
8. CHECK OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminals D24, D26 and ECM relay terminal 2. Refer to Wiring
Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 9.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK ECM POWER SUPPLY CIRCUIT-IV
1. Check harness continuity between ECM terminals A8, A9 and ECM relay terminal 7. Refer to Wiring Dia-
gram.
2. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 10.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
10. CHECK ECM RELAY
Refer to EC-1447, "
Component Inspection" .
OK or NG
OK >> GO TO 11.
NG >> Replace ECM relay.
11 . CHECK ECM POWER SUPPLY CIRCUIT-V
1. Turn ignition switch “OFF”.
2. Check voltage between ECM terminal A31 and ground.
OK or NG
OK >> GO TO 13.
NG >> GO TO 12.
12. DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors E65, F6
●20A fuse
●Harness for open or short between ECM and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors. Continuity should exist.
Continuity should exist.
Voltage: Battery voltage
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13.CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminals A5, A6, A7 and engine ground. Refer to Wiring Dia-
gram.
2. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 14.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
14.CHECK INTERMITTENT INCIDENT
Refer to EC-1441, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionEBS003PG
ECM RELAY
1. Apply 12V direct current between ECM relay terminals 1 and 2.
2. Check continuity between relay terminals 3 and 5, 6 and 7.
3. If NG, replace ECM relay.Continuity should exist.
Condition Continuity
12V direct current supply between ter-
minals 1 and 2Ye s
OFF No
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![NISSAN X-TRAIL 2001 Service Repair Manual EC-1448
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DTC U1000 CAN COMMUNICATION LINE
DTC U1000 CAN COMMUNICATION LINE
PFP:23710
DescriptionEBS00LUE
CAN (Controller Area Network) is a serial communication line for real time application. It NISSAN X-TRAIL 2001 Service Repair Manual EC-1448
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DTC U1000 CAN COMMUNICATION LINE
DTC U1000 CAN COMMUNICATION LINE
PFP:23710
DescriptionEBS00LUE
CAN (Controller Area Network) is a serial communication line for real time application. It](/manual-img/5/57405/w960_57405-1797.png)
EC-1448
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DTC U1000 CAN COMMUNICATION LINE
DTC U1000 CAN COMMUNICATION LINE
PFP:23710
DescriptionEBS00LUE
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.
On Board Diagnosis LogicEBS00LUF
DTC Confirmation ProcedureEBS00LUG
1. Turn ignition switch “ON” and wait at least 3 seconds.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. If 1st trip DTC is detected, go to EC-1450, "
Diagnostic Procedure" .
DTC No.Trouble diagnosis
nameDTC detecting condition Possible cause
U1000
1000CAN communication
line
●ECM can not communicate to other control
unit.
●ECM can not communicate for more than the
specified time.
●Harness or connectors
(CAN communication line is open or
shorted)
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DTC U1000 CAN COMMUNICATION LINE
EC-1449
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Wiring DiagramEBS00LUH
TBWA0336E
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EC-1450
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DTC U1000 CAN COMMUNICATION LINE
Diagnostic Procedure
EBS00LUI
1. INSPECTION START
1. Turn ignition switch “ON”.
2. Select “CAN DIAG SUPPORT MNTR” in “DATA MONITOR” mode with CONSULT-II.
3. Print out the CONSULT-II screen.
>> Go to LAN-12, "
CAN SYSTEM (FOR M/T MODELS)" .
PBIB1411E