2001 NISSAN X-TRAIL ignition

TROUBLE DIAGNOSIS
EC-1439
[YD]
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EC
NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.
*: Accelerator pedal position sensor 2 signal is converted by ECM internally. Thus, it differ from ECM terminals voltage. BARO SEN
●Ignition switch: ONAltitude
Approx. 0m: Approx. 100.62 kPa
(1.0062 bar, 1.026 kg/cm
2 , 14 .5 9
psi)
Approx. 1,000 m: Approx. 88.95
kPa (0.8895 bar, 0.907 kg/cm
2 ,
12.90 psi)
Approx. 1,500 m: Approx. 83.16
kPa (0.8316 bar, 0.848 kg/cm
2 ,
12.06 psi)
Approx. 2,000 m: Approx. 78.36
kPa (0.7836 bar, 0.799 kg/cm
2 ,
11.36 psi)
CYL COUNT
●Engine is running 0 → 1 → 2 → 3 MONITOR ITEM CONDITION SPECIFICATION

EC-1442
[YD]
POWER SUPPLY CIRCUIT FOR ECM
POWER SUPPLY CIRCUIT FOR ECM
PFP:24110
ECM Terminals and Reference ValueEBS00369
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.
TERMI-
NAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC Voltage and Pulse Signal)
A5
A6
A7B
B
BECM ground[Engine is running]
●Idle speedApproximately 0V
A8
A9R
RPower supply for ECM[Ignition switch "ON"]BATTERY VOLTAGE
(11 - 14V)
A31 W/L Power supply for ECM[Ignition switch “ON”]BATTERY VOLTAGE
(11 - 14V)
D18
D19W/R
W/RIgnition switch [Ignition switch “ON”]BATTERY VOLTAGE
(11 - 14V)
D24
D26G
GECM relay (self-shutoff)[Ignition switch “ON”]
[Ignition switch “OFF”]
●For a few seconds after turning ignition
switch "OFF"Approximately 0V
[Ignition switch “OFF”]
●A few seconds passed after turning ignition
switch "OFF"BATTERY VOLTAGE
(11 - 14V)

EC-1444
[YD]
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.

POWER SUPPLY CIRCUIT FOR ECM
EC-1445
[YD]
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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

EC-1446
[YD]
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
PBIB0478E

EC-1448
[YD]
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)

EC-1450
[YD]
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

DTC P0100 MASS AIR FLOW SENSOR (MAFS)
EC-1451
[YD]
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DTC P0100 MASS AIR FLOW SENSOR (MAFS)PFP:22680
Component DescriptionEBS004Q0
The mass air flow sensor (MAFS) is placed in the stream of intake
air. It measures the intake air flow rate by measuring a part of the
entire intake air flow. It consists of a hot film that is supplied with
electric current from the ECM. The temperature of the hot film is con-
trolled by the ECM a certain amount. The heat generated by the hot
film is reduced as the intake air flows around it. The more air, the
greater the heat loss.
Therefore, the ECM must supply more electric current to maintain
the temperature of the hot film as air flow increases. The ECM
detects the air flow by means of this current change.
CONSULT-II Reference Value in Data Monitor ModeEBS004Q1
Specification data are reference values.
ECM Terminals and Reference ValueEBS00BR6
Specification data are reference values, and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.
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.
SEF987W
MONITOR ITEM CONDITION SPECIFICATION
MAS AIR/FL SE
●Engine: After warming up
●Air conditioner switch: “OFF”
●Shift lever: Neutral position
●No-loadIdle 1.0 - 2.5V
2,000 rpm 2.1 - 2.7V
TERMI-
NAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC Voltage and Pulse Signal)
A8
A9R
RPower supply for ECM[Ignition switch "ON"]BATTERY VOLTAGE
(11 - 14V)
A10 R Mass air flow sensor[Engine is running]
●Warm-up condition
●Idle speed0.5 - 2.5V
[Engine is running]
●Warm-up condition
●Engine speed is 2,000 rpm1.5 - 3.5V
A24 BMass air flow sensor
ground[Engine is running]
●Warm-up condition
●Idle speedApproximately 0V
A27 W Sensor's power supply[Ignition switch "ON"]Approximately 5V
PBIB0389E
PBIB0390E