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![NISSAN ALMERA N16 2003 Electronic Repair Manual POWER SUPPLY CIRCUIT FOR ECM
EC-487
[QG (WITHOUT EURO-OBD)]
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Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM NISSAN ALMERA N16 2003 Electronic Repair Manual POWER SUPPLY CIRCUIT FOR ECM
EC-487
[QG (WITHOUT EURO-OBD)]
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Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM](/manual-img/5/57350/w960_57350-816.png)
POWER SUPPLY CIRCUIT FOR ECM
EC-487
[QG (WITHOUT EURO-OBD)]
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Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
Diagnostic ProcedureEBS00KFA
1.INSPECTION START
Start engine.
Is engine running?
Ye s o r N o
Ye s > > G O T O 1 0 .
No >> GO TO 2.
2.CHECK ECM POWER SUPPLY CIRCUIT-I
1. Turn ignition switch “OFF” and then “ON”.
2. Check voltage between ECM terminal 109 and ground with
CONSULT-II or tester.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
1 B ECM ground[Engine is running]
●Idle speedEngine ground
109 B/R Ignition switch[Ignition switch “OFF”]0V
[Ignition switch “ON”]BATTERY VOLTAGE
(11 - 14V)
111 W / GECM relay
(Self shut-off)[Engine is running]
[Ignition switch “OFF”]
●For a few seconds after turning ignition switch
“OFF”0 - 1.0V
[Ignition switch “OFF”]
●More than a few seconds passed after turning
ignition switch “OFF”BATTERY VOLTAGE
(11 - 14V)
11 5
11 6B
BECM ground[Engine is running]
●Idle speedEngine ground
11 9
120W
WPower supply for
ECM[Ignition switch “ON”]BATTERY VOLTAGE
(11 - 14V)
Voltage: Battery voltage
MBIB0015E
Page 818 of 3189
EC-488
[QG (WITHOUT EURO-OBD)]
POWER SUPPLY CIRCUIT FOR ECM
3. DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors M202, F115
●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-I
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminals 1, 115, 116 and engine ground.
Refer to Wiring Diagram.
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.
5. CHECK ECM POWER SUPPLY CIRCUIT-II
1. Disconnect ECM relay.
2. Check voltage between ECM relay terminals 1 and 6 and
ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 7.
NG >> GO TO 6.Continuity should exist.
MBIB0247E
Voltage: Battery voltage
SEF420X
Page 819 of 3189
![NISSAN ALMERA N16 2003 Electronic Repair Manual POWER SUPPLY CIRCUIT FOR ECM
EC-489
[QG (WITHOUT EURO-OBD)]
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6.DETECT MALFUNCTIONING PART
Check the following.
●10A fuse
●15A fuse
●Harness for open or short between ECM NISSAN ALMERA N16 2003 Electronic Repair Manual POWER SUPPLY CIRCUIT FOR ECM
EC-489
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6.DETECT MALFUNCTIONING PART
Check the following.
●10A fuse
●15A fuse
●Harness for open or short between ECM](/manual-img/5/57350/w960_57350-818.png)
POWER SUPPLY CIRCUIT FOR ECM
EC-489
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6.DETECT MALFUNCTIONING PART
Check the following.
●10A fuse
●15A 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.
7.CHECK OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 111 and ECM relay terminal 2.
Refer to Wiring Diagram.
2. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 9.
NG >> GO TO 8.
8.DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors E225, F43
●Harness for open or short between ECM and ECM relay
>> Repair open circuit or short to ground or short to power in harness or connectors.
9.CHECK ECM RELAY
Refer to EC-491, "
Component Inspection" .
OK or NG
OK >> GO TO EC-660, "IGNITION SIGNAL" .
NG >> Replace ECM relay.
10.CHECK ECM POWER SUPPLY CIRCUIT-III
1. Stop engine and wait at least 10 seconds.
2. Turn ignition switch “ON” and then “OFF”.
3. Check voltage between ECM terminals 119, 120 and ground
with CONSULT-II or tester.
OK or NG
OK >> GO TO 14.
NG (Battery voltage does not exist.)>>GO TO 11.
NG (Battery voltage exists for more than a few seconds.)>>GO TO 12. Continuity should exist.
Voltage: After turning ignition switch “OFF”, battery
voltage will exist for a few seconds, then
drop approximately 0V.
MBIB0016E
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![NISSAN ALMERA N16 2003 Electronic Repair Manual EC-490
[QG (WITHOUT EURO-OBD)]
POWER SUPPLY CIRCUIT FOR ECM
11 . CHECK ECM POWER SUPPLY CIRCUIT-IV
1. Disconnect ECM relay.
2. Check voltage between ECM relay terminal 3 (LHD models) or 5
(RHD models NISSAN ALMERA N16 2003 Electronic Repair Manual EC-490
[QG (WITHOUT EURO-OBD)]
POWER SUPPLY CIRCUIT FOR ECM
11 . CHECK ECM POWER SUPPLY CIRCUIT-IV
1. Disconnect ECM relay.
2. Check voltage between ECM relay terminal 3 (LHD models) or 5
(RHD models](/manual-img/5/57350/w960_57350-819.png)
EC-490
[QG (WITHOUT EURO-OBD)]
POWER SUPPLY CIRCUIT FOR ECM
11 . CHECK ECM POWER SUPPLY CIRCUIT-IV
1. Disconnect ECM relay.
2. Check voltage between ECM relay terminal 3 (LHD models) or 5
(RHD models) and ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 12.
NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
12. CHECK ECM POWER SUPPLY CIRCUIT-V
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminals 119, 120 and ECM relay terminal 5 (LHD models) or 3
(RHD models).
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 14.
NG >> GO TO 13.
13. DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors E225, F43
●Harness for open or short between ECM and ECM relay
>> Repair open circuit or short to ground or short to power in harness or connectors.
14. CHECK ECM RELAY
Refer to EC-491, "
Component Inspection" .
OK or NG
OK >> GO TO 15.
NG >> Replace ECM relay.
MBIB0247E
Voltage: Battery voltage
MBIB0263E
Continuity should exist.
Page 821 of 3189
POWER SUPPLY CIRCUIT FOR ECM
EC-491
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15.CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-II
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminals 1, 115, 116 and engine ground.
Refer to Wiring Diagram.
4. Also check harness for short to power.
OK or NG
OK >> GO TO 16.
NG >> Repair open circuit or short to power in harness or connectors.
16.CHECK INTERMITTENT INCIDENT
Refer to EC-485, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionEBS00KFB
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 terminals 1 and
2Ye s
OFF No
PBIB0077E
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![NISSAN ALMERA N16 2003 Electronic Repair Manual EC-492
[QG (WITHOUT EURO-OBD)]
DTC U1000, U1001 CAN COMMUNICATION LINE
DTC U1000, U1001 CAN COMMUNICATION LINE
PFP:23710
DescriptionEBS00KFC
CAN (Controller Area Network) is a serial communication lin NISSAN ALMERA N16 2003 Electronic Repair Manual EC-492
[QG (WITHOUT EURO-OBD)]
DTC U1000, U1001 CAN COMMUNICATION LINE
DTC U1000, U1001 CAN COMMUNICATION LINE
PFP:23710
DescriptionEBS00KFC
CAN (Controller Area Network) is a serial communication lin](/manual-img/5/57350/w960_57350-821.png)
EC-492
[QG (WITHOUT EURO-OBD)]
DTC U1000, U1001 CAN COMMUNICATION LINE
DTC U1000, U1001 CAN COMMUNICATION LINE
PFP:23710
DescriptionEBS00KFC
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 LogicEBS00KFD
The MI will not light up for this diagnosis.
*1: This self-diagnosis has the one trip detection logic.
*2: The MI will not light up for this diagnosis.
DTC Confirmation ProcedureEBS00KFE
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-494, "
Diagnostic Procedure" .
DTC No.Trouble diagnosis
nameDTC detecting condition Possible cause
U1000*
1
1000*1CAN communication
line
●ECM cannot communicate to other control
units.
●ECM cannot communicate for more than the
specified time.
●Harness or connectors
(CAN communication line is open or
shorted.) U1001*
2
1001 *2
Page 823 of 3189
DTC U1000, U1001 CAN COMMUNICATION LINE
EC-493
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Wiring DiagramEBS00KFF
YEC276A
Page 824 of 3189
EC-494
[QG (WITHOUT EURO-OBD)]
DTC U1000, U1001 CAN COMMUNICATION LINE
Diagnostic Procedure
EBS00KFG
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.
A/T models
M/T models
>> Go to EL-509.
MBIB0180E
MBIB0179E