NISSAN X-TRAIL 2003 Electronic Repair Manual

TROUBLE DIAGNOSIS
EC-697
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MAS AIR/FL SE
lEngine: After warming up
lAir conditioner switch: OFF
lShift lever: Neutral position
lNo-loadIdle 1.0 - 2.5V
2,000 rpm 2.1 - 2.7V
BATTERY VOLT
lIgnition switch: ON (Engine stopped) 11 - 14V
P/N POSI SW
lIgnition switch: ONShift lever: Neutral position ON
Except above OFF
START SIGNAL
lIgnition switch: ON®START®ON OFF®ON®OFF
PW/ST SIGNAL
lEngine: After warming up, idle
the engineSteering wheel is in neutral posi-
tion. (Forward direction)OFF
Steering wheel is turned. ON
BRAKE SW
lIgnition switch: ONBrake pedal: Fully released OFF
Brake pedal: Slightly depressed ON
IGN SW
lIgnition switch: ON®OFF ON®OFF
ACT CR PRESS
lEngine: After warming up
lAir conditioner switch: OFF
lShift lever: Neutral position
lNo-loadIdle 30 - 40 MPa
2,000 rpm 40 - 50 MPa
SUCTION CV
lEngine: After warming up
lAir conditioner switch: OFF
lShift lever: Neutral position
lNo-loadIdle 70.0 - 71.5°CA
2,000 rpm 73.5 - 75.0°CA
MAIN INJ WID
lEngine: After warming up
lShift lever: Neutral position
lIdle speedNo-load 0.68 - 0.78 msec
Air conditioner switch: ON
Rear window defogger switch: ON0.78 - 0.88 msec
GLOW RLY Refer toEC-796, "
GLOW CONTROL SYSTEM".
COOLING FAN
lWhen cooling fan is stopped. OFF
lWhen cooling fans operate at low speed. LOW
lWhen cooling fans operate at high speed. HIGH
EGR VOL CON/V
lEngine: After warming up
lAir conditioner switch: OFF
lShift lever: Neutral position
lNo-loadAfter one minute at idle More than 10 steps
Revvingenginefromidleto3,600
rpm0step
INT/A VOLUME
lEngine: After warming up, idle the engine 150 - 450 mg/st
BARO SEN
lIgnition switch: ONAltitude
Approx. 0m: Approx. 100.62 kPa
(1.0062 bar, 1.026 kg/cm
2,14.59
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 . 3 6 p s i )
CYL COUNT
lEngine is running 0®1®2®3 MONITOR ITEM CONDITION SPECIFICATION

EC-698
[YD]
TROUBLE DIAGNOSIS
NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.
Major Sensor Reference Graph in Data Monitor ModeEBS0037J
The following are the major sensor reference graphs in “DATA MONITOR” mode.
ACCEL POS SEN, “CKPS·RPM (TDC)”, “MAS AIR/FL SE”
Below is the data for “ACCEL POS SEN”, “CKPS·RPM (TDC)” and “MAS AIR/FL SE” when revving engine
quickly up to 3,000 rpm under no load after warming up engine to the normal operating temperature.
Each value is for reference, the exact value may vary.
SEF321Y

TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT
EC-699
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TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTPFP:00006
DescriptionEBS00321
Intermittent incidents (I/I) may occur. In many cases, the problem resolves itself (the part or circuit function
returns to normal without intervention). It is important to realize that the symptoms described in the customer's
complaint often do not recur on DTC visits. Realize also that the most frequent cause of I/I occurrences is poor
electrical connections. Because of this, the conditions under which the incident occurred may not be clear.
Therefore, circuit checks made as part of the standard diagnostic procedure may not indicate the specific
problem area.
COMMON I/I REPORT SITUATIONS
Diagnostic ProcedureEBS00322
1.INSPECTION START
Erase DTCs. Refer toEC-666, "
HOW TO ERASE DTC".
>> GO TO 2.
2.CHECK GROUND TERMINALS
Check ground terminals for corroding or loose connection.
Refer toGI-24, "
How to Perform Efficient Diagnosis for an Electrical Incident", "CIRCUIT INSPECTION",
"Ground Inspection".
OK or NG
OK >> GO TO 3.
NG >> Repair or replace.
3.SEARCH FOR ELECTRICAL INCIDENT
PerformGI-24, "
How to Perform Efficient Diagnosis for an Electrical Incident", "INCIDENT SIMULATION
TESTS".
OK or NG
OK >>INSPECTION END
NG >> Repair or replace.
STEP in Work Flow Situation
II The CONSULT-II is used. The SELF-DIAG RESULTS screen shows time data other than “0”.
III The symptom described by the customer does not recur.
IV DTC does not appear during the DTC Confirmation Procedure.
VI The Diagnostic Procedure for XXXX does not indicate the problem area.

EC-700
[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]
lIdle 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”]
lFor a few seconds after turning ignition
switch "OFF"Approximately 0V
[Ignition switch “OFF”]
lA few seconds passed after turning ignition
switch "OFF"BATTERY VOLTAGE
(11 - 14V)

POWER SUPPLY CIRCUIT FOR ECM
EC-701
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Wiring DiagramEBS0036A
TBWA0101E

EC-702
[YD]
POWER SUPPLY CIRCUIT FOR ECM
Diagnostic Procedure
EBS0036B
1.INSPECTION START
Start engine.
Is engine running?
Ye s o r N o
Yes >>GOTO6.
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.
lHarness connectors M63, F30
lFuse block (J/B) connector M1
l10A fuse
lHarness 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-703
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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 toEC-758,
"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.
lHarness connectors E65, F6
l20A fuse
lHarness for open or short between ECM relay and battery
>> Repair open circuit or short to ground or short to power in harness or connectors. Vo l ta g e :
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-704
[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 toEC-705, "
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.
lHarness connectors E65, F6
l20A fuse
lHarness 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

POWER SUPPLY CIRCUIT FOR ECM
EC-705
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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 toEC-699, "
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
PBIB0077E

EC-706
[YD]
DTC P0100 MASS AIR FLOW SENSOR (MAFS)
DTCP0100MASSAIRFLOWSENSOR(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.
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
lEngine: After warming up
lAir conditioner switch: “OFF”
lShift lever: Neutral position
lNo-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]
lWarm-up condition
lIdle speed0.5 - 2.5V
[Engine is running]
lWarm-up condition
lEngine speed is 2,000 rpm1.5 - 3.5V
A24 BMass air flow sensor
ground[Engine is running]
lWarm-up condition
lIdle speedApproximately 0V
A27 W Sensor's power supply[Ignition switch "ON"]Approximately 5V
PBIB0389E
PBIB0390E