2003 NISSAN X-TRAIL Service Repair Manual

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Page 521 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual DTC P0031, P0032 HO2S1 HEATER
EC-143
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Component InspectionEBS010MR
HEATED OXYGEN SENSOR 1 HEATER
1. Check resistance between HO2S1 terminals as follows.

Page 522 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual EC-144
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DTC P0037, P0038 HO2S2 HEATER

DTC P0037, P0038 HO2S2 HEATERPFP:226A0
DescriptionEBS010MT
SYSTEM DESCRIPTION
OPERATION
CONSULT-II Reference Value in Data Monitor ModeEBS01

EC-144
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DTC P0037, P0038 HO2S2 HEATER

DTC P0037, P0038 HO2S2 HEATERPFP:226A0
DescriptionEBS010MT
SYSTEM DESCRIPTION
OPERATION
CONSULT-II Reference Value in Data Monitor ModeEBS010MU
Specification data are reference values.
On Board Diagnosis LogicEBS010MV
DTC Confirmation ProcedureEBS010MW
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is between 10.5V and 16V at
idle.
Sensor Input Signal to ECM ECM function Actuator
Camshaft position sensor (PHASE)
Crankshaft position sensor (POS)Engine speed
Heated oxygen sensor 2
heater controlHeated oxygen sensor 2 heater
Engine coolant temperature sensor Engine coolant temperature
Mass air flow sensor Amount of intake air
Engine speed rpm Heated oxygen sensor 2 heater
Above 3,600OFF
Below 3,600 rpm after the following conditions are met.
Engine: After warming up
Keeping the engine speed between 3,500 and 4,000 rpm for 1
minute and at idle for 1 minute under no loadON
MONITOR ITEM CONDITION SPECIFICATION
HO2S2 HTR (B1)
Engine speed is below 3,600 rpm after the following conditions are met
–Warm-up condition
–Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute
and at idle for 1 minute under no loadON
Engine speed: Above 3,600 rpm OFF
DTC No.Trouble diagnosis
nameDTC detecting condition Possible cause
P0037
0037Heated oxygen
sensor 2 heater
control circuit lowThe current amperage in the heated oxygen sen-
sor 2 heater circuit is out of the normal range.
(An excessively low voltage signal is sent to ECM
through the heated oxygen sensor 2 heater.)
Harness or connectors
(The heated oxygen sensor 2 heater circuit is
open or shorted.)
Heater oxygen sensor 2 heater
P0038
0038Heated oxygen
sensor 2 heater
control circuit highThe current amperage in the heated oxygen sen-
sor 2 heater circuit is out of the normal range.
(An excessively high voltage signal is sent to
ECM through the heated oxygen sensor 2
heater.)
Harness or connectors
(The heated oxygen sensor 2 heater circuit is
shorted.)
Heater oxygen sensor 2 heater

Page 523 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual DTC P0037, P0038 HO2S2 HEATER
EC-145
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WITH CONSULT-II
1. Turn ignition switch ON and select “DATA MONITOR” mode with
CONSULT-II.
2. Start engine an

Page 524 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual EC-146
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DTC P0037, P0038 HO2S2 HEATER

Wiring DiagramEBS010MX
TBWA0597E

Page 525 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual DTC P0037, P0038 HO2S2 HEATER
EC-147
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Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM

Page 526 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual EC-148
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DTC P0037, P0038 HO2S2 HEATER

3. CHECK HO2S2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness c

Page 527 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual DTC P0102, P0103 MAF SENSOR
EC-149
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DTC P0102, P0103 MAF SENSORPFP:22680
Component DescriptionEBS010N1
The mass air flow sensor is placed in the stream

DTC P0102, P0103 MAF SENSOR
EC-149
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DTC P0102, P0103 MAF SENSORPFP:22680
Component DescriptionEBS010N1
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. The mass air flow sensor controls the temperature of the hot
wire to a certain amount. The heat generated by the hot wire is
reduced as the intake air flows around it. The more air, the greater
the heat loss.
Therefore, the electric current supplied to hot wire is changed to
maintain the temperature of the hot wire as air flow increases. The
ECM detects the air flow by means of this current change.
CONSULT-II Reference Value in Data Monitor ModeEBS010N2
Specification data are reference values.
On Board Diagnosis LogicEBS010N3
These self-diagnoses have the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MI lights up.
DTC Confirmation ProcedureEBS010N4
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
PROCEDURE FOR DTC P0102
With CONSULT-II
1. Turn ignition switch ON.
PBIB1604E
MONITOR ITEM CONDITION SPECIFICATION
MAS A/F SE-B1 See EC-119, "
TROUBLE DIAGNOSIS - SPECIFICATION VALUE" .
CAL/LD VALUE
Engine: After warming up
Air conditioner switch: OFF
Shift lever: N (A/T), Neutral (M/T)
No loadIdle 10% - 35%
2,500 rpm 10% - 35%
MASS AIRFLOW
Engine: After warming up
Air conditioner switch: OFF
Shift lever: N (A/T), Neutral (M/T)
No loadIdle 1.0 - 4.0 g·m/s
2,500 rpm 4.0 - 10.0 g·m/s
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0102
0102Mass air flow sensor circuit
low inputAn excessively low voltage from the sensor
is sent to ECM when engine is running.
Harness or connectors
(The sensor circuit is open or shorted.)
Intake air leaks
Mass air flow sensor
P0103
0103Mass air flow sensor circuit
high inputAn excessively high voltage from the sensor
is sent to ECM.
Harness or connectors
(The sensor circuit is open or shorted.)
Mass air flow sensor
Detected items Engine operating condition in fail-safe mode
Mass air flow sensor circuit Engine speed will not rise more than 2,400 rpm due to the fuel cut.

Page 528 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual EC-150
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DTC P0102, P0103 MAF SENSOR

2. Select “DATA MONITOR” mode with CONSULT-II.
3. Start engine and wait at least 5 seconds.
4. If DTC is detected, go to EC-152, "
Diagnos

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