2001 NISSAN X-TRAIL Service Repair Manual

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Page 1217 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual DTC P0037, P0038 HO2S2 HEATER
EC-867
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Wiring DiagramEBS00MU3
TBWA0062E

Page 1218 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual EC-868
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DTC P0037, P0038 HO2S2 HEATER
Diagnostic Procedure
EBS00MU4
1. CHECK HO2S2 POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect heated oxygen sensor 2 har

Page 1219 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual DTC P0037, P0038 HO2S2 HEATER
EC-869
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4.CHECK HEATED OXYGEN SENSOR 2 HEATER
Refer to EC-869, "
Component Inspection" .
OK or NG
OK >> GO TO 5.
NG

Page 1220 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual EC-870
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DTC P0102, P0103 MAF SENSOR
DTC P0102, P0103 MAF SENSOR
PFP:22680
Component DescriptionEBS00MU7
The mass air flow sensor is placed in the stream of intake air. It mea-
sur

EC-870
[QR20(WITH EURO-OBD)]
DTC P0102, P0103 MAF SENSOR
DTC P0102, P0103 MAF SENSOR
PFP:22680
Component DescriptionEBS00MU7
The mass air flow sensor is placed in the stream of intake air. It mea-
sures the intake flow rate by measuring a part of the entire intake
flow. It consists of a hot film that is supplied with electric current from
the ECM. The temperature of the hot film is controlled 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 ModeEBS00MU8
Specification data are reference values.
ECM Terminals and Reference ValueEBS00MU9
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.
On Board Diagnosis LogicEBS00MUA
These self-diagnoses have the one trip detection logic.
SEC266C
MONITOR ITEM CONDITION SPECIFICATION
MAS A/F SE-B1
●Engine: After warming up
●Air conditioner switch: OFF
●Shift lever: N
●No-loadIdle Approx. 1.0 - 1.5V
2,500 rpm Approx. 1.6 - 2.0V
CAL/LD VALUE
●Engine: After warming up
●Shift lever: N
●Air conditioner switch: OFF
●No-loadIdle 10% - 35%
2,500 rpm 10% - 35%
MASS AIRFLOW
●Engine: After warming up
●Shift lever: N
●Air conditioner switch: OFF
●No-loadIdle 1.0 - 4.0 g·m/s
2,500 rpm 4.0 - 10.0 g·m/s
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
72 OR Mass air flow sensor[Engine is running]
●Warm-up condition
●Idle speed1.1 - 1.5V
[Engine is running]
●Warm-up condition
●Engine speed is 2,500 rpm.1.6 - 2.0V
80 B/PMass air flow sensor
ground[Engine is running]
●Warm-up condition
●Idle speedApproximately 0V

Page 1221 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual DTC P0102, P0103 MAF SENSOR
EC-871
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FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MI lights up.
DTC Confirmation

Page 1222 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual EC-872
[QR20(WITH EURO-OBD)]
DTC P0102, P0103 MAF SENSOR
Wiring Diagram
EBS00MUC
TBWA0055E

Page 1223 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual DTC P0102, P0103 MAF SENSOR
EC-873
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Diagnostic ProcedureEBS00MUD
1.INSPECTION START
Which malfunction (P0102 or P0103) is duplicated?
P0102 or P0103
P010

Page 1224 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual EC-874
[QR20(WITH EURO-OBD)]
DTC P0102, P0103 MAF SENSOR
5. DETECT MALFUNCTIONING PART
Check the following.
●Harness for open or short between ECM relay and mass air flow sensor
●Harness for open

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