Page 1793 of 3066
TROUBLE DIAGNOSIS
EC-679
[YD]
C
D
E
F
G
H
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J
K
L
MA
EC
1 - 5: The numbers refer to the order of inspection.
(continued on next page)
ENGINE CONTROL
Camshaft position sensor circuitEC-739
Start signal circuitEC-818
Ignition switch circuitEC-700
Power supply for ECM circuit11EC-700
Cooling fan relay circuit 2EC-761
EGR volume control valve circuit 1EC-803
Glow relay circuit1EC-796
ECM relay (Self-shutoff) circuit1EC-790
ECM,connectorcircuit 22222222222EC-749,EC-
788
Air conditioner relay circuitEC-824
Air conditioner switch circuitEC-824
NATS (Nissan Anti-theft System)1EC-666
SYSTEM — Basic engine control systemSYMPTOM
Reference page
ROUGH IDLE/HUNTING IDLING VIBRATION
SLOW/NO RETURN TO IDLE
OVERHEAT/HIGH ENGINE COOLANT TEMPERATURE EXCESSIVE FUEL CONSUMPTION
EXCESSIVE OIL CONSUMPTION ABNORMAL SMOKE COLOR DEAD BATTERY (UNDER CHARGE) Malfunction indicator illuminates. Can be detected by CONSULT-II?
BLACK SMOKE WHITE SMOKE
Warranty symptom code AG AH AJ AK AL AM AP HA
Page 1794 of 3066
EC-680
[YD]
TROUBLE DIAGNOSIS
Engine Control Component Parts Location
EBS00372
PBIB0383E
Page 1795 of 3066
TROUBLE DIAGNOSIS
EC-681
[YD]
C
D
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F
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MA
EC
PBIB0474E
Page 1796 of 3066
EC-682
[YD]
TROUBLE DIAGNOSIS
PBIB0475E
Page 1797 of 3066
TROUBLE DIAGNOSIS
EC-683
[YD]
C
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F
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H
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MA
EC
Circuit DiagramEBS0037G
TBWA0099E
Page 1798 of 3066
EC-684
[YD]
TROUBLE DIAGNOSIS
TBWA0100E
Page 1799 of 3066
TROUBLE DIAGNOSIS
EC-685
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EC
ECM Harness Connector Terminal LayoutEBS00374
ECM Terminals And Reference ValueEBS00375
PREPARATION
1. ECM is located behind the glove box. For this inspection,
remove glove box.
2. Perform all voltage measurements with the connector con-
nected. Extend tester probe as shown to perform tests easily.
lOpen harness securing clip to make testing easier.
lUse extreme care not to touch 2 pins at one time.
lData is for comparison and may not be exact.
ECM INSPECTION TABLE
Remarks: 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.
PBIB0473E
PBIB0377E
MEC486B
Page 1800 of 3066
![NISSAN X-TRAIL 2003 Electronic Repair Manual EC-686
[YD]
TROUBLE DIAGNOSIS
TERMI-
NAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC Voltage and Pulse Signal)
A1
A2
A3
A4L/W
Y/PU
PU
YEDU drive No. 2
EDU drive No. 4
EDU drive No. 3
EDU drive No. 1[Engine is NISSAN X-TRAIL 2003 Electronic Repair Manual EC-686
[YD]
TROUBLE DIAGNOSIS
TERMI-
NAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC Voltage and Pulse Signal)
A1
A2
A3
A4L/W
Y/PU
PU
YEDU drive No. 2
EDU drive No. 4
EDU drive No. 3
EDU drive No. 1[Engine is](/manual-img/5/57402/w960_57402-1799.png)
EC-686
[YD]
TROUBLE DIAGNOSIS
TERMI-
NAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC Voltage and Pulse Signal)
A1
A2
A3
A4L/W
Y/PU
PU
YEDU drive No. 2
EDU drive No. 4
EDU drive No. 3
EDU drive No. 1[Engine is running]
lWarm-up condition
lIdle speed0-4V
[Engine is running]
lWarm-up condition
lEngine speed is 2,000 rpm0-4V
A5
A6
A7B
B
BECM ground[Engine is running]
lIdle speedApproximately 0V
A8
A9R
RPower supply for ECM[Ignition switch "ON"]BATTERY VOLTAGE
(11 - 14V)
A10 R Mass air flow sensor[Engine is running]
lWarm-up condition
lIdle speed0.5 - 2.5V
[Engine is running]
lWarm-up condition
lEngine speed is 2,000 rpm1.5 - 3.5V
A11 L/OREngine coolant tempera-
ture sensor[Engine is running]
lWarm-up conditionApproximately 0 - 4.8V
Output voltage varies with engine
coolant temperature
A12 PU Fuel temperature sensor[Engine is running]
lWarm-up conditionApproximately 0 - 4.8V
Output voltage varies with fuel
temperature
A21 BAccelerator pedal
released position switch
ground[Ignition switch "ON"]Approximately 0V
A22 LGAccelerator pedal position
sensor 1 ground[Ignition switch "ON"]Approximately 0V
A23 B Sensor's ground[Engine is running]
lWarm-up condition
lIdle speedApproximately 0V
PBIB0387E
PBIB0388E
PBIB0389E
PBIB0390E