NISSAN X-TRAIL 2001 Service Repair Manual

DTC P0120 ACCELERATOR PEDAL POSITION SENSOR
EC-1461
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On Board Diagnosis LogicEBS004R8
DTC Confirmation ProcedureEBS004R9
WITH CONSULT-II
1. Turn ignition switch “ON”.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Depress and release fully accelerator pedal slowly.
4. If DTC is detected, go to EC-1463, "
Diagnostic Procedure" .
A26 LG/RAccelerator pedal position
sensor 2 ground[Ignition switch “ON”]Approximately 0V
A28 PU/RAccelerator pedal position
sensor 1 power supply [Ignition switch “ON”]Approximately 5V
B15 WAccelerator pedal position
sensor 1[Ignition switch “ON”]
●Engine stopped
●Accelerator pedal fully released0.8 - 1.3V
[Ignition switch “ON”]
●Engine stopped
●Accelerator pedal fully depressedMore than 3.5V
B16 GAccelerator pedal position
sensor 2[Ignition switch “ON”]
●Engine stopped
●Accelerator pedal fully released0.3 - 1.8V
[Ignition switch “ON”]
●Engine stopped
●Accelerator pedal fully depressedMore than 3.0V
B23 GY/LAccelerator pedal position
sensor 2 power supply[Ignition switch “ON”]Approximately 5V
D14 G/YAccelerator pedal
released position switch[Ignition switch “ON”]
●Engine stopped
●Accelerator pedal slightly depressedBATTERY VOLTAGE
(11 - 14V)
[Ignition switch “ON”]
●Engine stopped
●Accelerator pedal fully releasedApproximately 0V TERMI-
NAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC Voltage and Pulse Signal)
DTC Malfunction is detected when ... Check Items (Possible Cause)
P0120
●An improper voltage signal from accelerator pedal
position sensor 1 and/or 2 is send to ECM.●Harness or connectors
(The sensor circuit is open or shorted.)
●Accelerator pedal position sensor 1
●Accelerator pedal position sensor 2
●Accelerator pedal released position switch
SEF817Y

EC-1462
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DTC P0120 ACCELERATOR PEDAL POSITION SENSOR
Wiring Diagram
EBS004RA
TBWA0112E

DTC P0120 ACCELERATOR PEDAL POSITION SENSOR
EC-1463
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Diagnostic ProcedureEBS004RB
1.CHECK ACCELERATOR PEDAL POSITION SENSOR FUNCTION
With CONSULT-II
1. Turn ignition switch “ON”.
2. Select “ACCEL POS SEN” and “ACCEL SEN 2” in “DATA MONITOR” mode with CONSULT-II.
3. Check “ACCEL POS SEN” and “ACCEL SEN 2” signal under
the following conditions.
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.
2.CHECK ACCELERATOR PEDAL RELEASED POSITION SWITCH FUNCTION
With CONSULT-II
1. Select “OFF ACCEL SW” in “DATA MONITOR” mode with CONSULT-II.
2. Check “OFF ACCEL SW” signal under the following conditions.
OK or NG
OK >> GO TO 16.
NG >> GO TO 10.
Conditions ACCEL POS SEN ACCEL SEN 2
Accelerator pedal fully
released 0.8 - 1.3V 0.3 - 1.8V
Accelerator pedal fully
depressedMore than 3.5V More than 3.0V
PBIB0403E
Conditions OFF ACCEL SW
Accelerator pedal fully released ON
Accelerator pedal depressed OFF
PBIB0404E

EC-1464
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DTC P0120 ACCELERATOR PEDAL POSITION SENSOR
3. CHECK ACCELERATOR PEDAL POSITION SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect accelerator work unit harness connector.
3. Turn ignition switch “ON”.
4. Check voltage between accelerator work unit terminals 7, 1 and
ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 5.
NG >> GO TO 4.
4. DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors F30, M63
●Harness for open or short between ECM and accelerator work unit
>> Repair harness or connectors.
5. CHECK ACCELERATOR PEDAL POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screw.
3. Check harness continuity between accelerator work unit termi-
nals 2, 8 and engine ground. Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 7.
NG >> GO TO 6.
6. DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors F30, M63
●Harness for open or short between ECM and accelerator work unit
>> Repair open circuit or short to ground or short to power in harness or connectors.
PBIB0379E
Voltage: Approximately 5V
PBIB0364E
Continuity should exist.
PBIB0385E

DTC P0120 ACCELERATOR PEDAL POSITION SENSOR
EC-1465
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7.CHECK ACCELERATOR PEDAL POSITION SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND
SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal B15 and accelerator work unit terminal 6, ECM terminal
B16 and accelerator work unit terminal 3. Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 9.
NG >> GO TO 8.
8.DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors F30, M63
●Harness for open or short between ECM and accelerator work unit
>> Repair open circuit or short to ground or short to power in harness or connectors.
9.CHECK ACCELERATOR PEDAL POSITION SENSOR
Refer to EC-1466, "
Component Inspection" .
OK or NG
OK >> GO TO 16.
NG >> GO TO 15.
10.CHECK ACCELERATOR PEDAL RELEASED POSITION SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect accelerator work unit harness connector.
3. Turn ignition switch “ON”.
4. Check voltage between accelerator work unit terminal 5 and
ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 12.
NG >> GO TO 11.Continuity should exist.
PBIB0379E
Voltage: Battery voltage
PBIB0365E

EC-1466
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DTC P0120 ACCELERATOR PEDAL POSITION SENSOR
11 . DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors F30, M63
●Harness for open or short between accelerator work unit and ECM
>> Repair harness or connectors.
12. CHECK ACCELERATOR PEDAL RELEASED POSITION SWITCH GROUND CIRCUIT FOR OPEN
AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between accelerator work unit terminal 4 and ECM terminal A21. Refer to Wir-
ing Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 14.
NG >> GO TO 13.
13. DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors F30, M63
●Harness for open or short between ECM and accelerator work unit
>> Repair open circuit or short to ground or short to power in harness or connectors.
14. CHECK ACCELERATOR PEDAL RELEASED POSITION SWITCH
Refer to EC-1466, "
Component Inspection" .
OK or NG
OK >> GO TO 16.
NG >> GO TO 15.
15. REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator work unit.
2. Perform EC-1404, "
Accelerator Pedal Released Position Learning" .
>>INSPECTION END
16. CHECK INTERMITTENT INCIDENT
Refer to EC-1441, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionEBS004RC
ACCELERATOR PEDAL POSITION SENSOR
With CONSULT-II
1. Reconnect all disconnected harness connectors.
2. Turn ignition switch “ON”.Continuity should exist.

DTC P0120 ACCELERATOR PEDAL POSITION SENSOR
EC-1467
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3. Select “DATA MONITOR” mode with CONSULT-II.
4. Check the indication of “ACCEL POS SEN” and “ACCEL SEN
2"under the following conditions.
ACCELERATOR PEDAL RELEASED POSITION SWITCH
Check continuity between accelerator position switch terminals 4
and 5 under the following conditions.
Removal and InstallationEBS008YG
ACCELERATOR WORK UNIT
Refer to ACC-2, "ACCELERATOR CONTROL SYSTEM" .
Conditions ACCEL POS SEN ACCEL SEN 2
Accelerator pedal fully
released 0.8 - 1.3V 0.3 - 1.8V
Accelerator pedal fully
depressedMore than 3.5V More than 3.0V
PBIB0403E
Conditions Continuity
Accelerator pedal fully released Should exist.
Accelerator pedal depressed Should not exist.
PBIB0366E

EC-1468
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DTC P0190 COMMON RAIL FUEL PRESSURE SENSOR
DTC P0190 COMMON RAIL FUEL PRESSURE SENSOR
PFP:16638
DescriptionEBS004RD
The common rail fuel pressure sensor is placed to the common rail. It measures the fuel pressure in the com-
mon rail. The sensor sends voltage signal to the ECM. As the pressure increases, the voltage rises.
The ECM controls the fuel pressure in the common rail by the suction control valve. The ECM uses the signal
from common rail fuel pressure sensor as a feedback signal.
CONSULT-II Reference Value in Data Monitor ModeEBS008YH
Specification data are reference values.
ECM Terminals and Reference ValueEBS008YI
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 LogicEBS004RE
DTC Confirmation ProcedureEBS004RF
WITH CONSULT-II
1. Turn ignition switch “ON”.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Wait at least 5 seconds.
4. If DTC is detected, go to EC-1470, "
Diagnostic Procedure" .
MONITOR CONDITION SPECIFICATOIN
ACT CR PRESS
●Engine: After warming up
●Air conditioner switch: OFF
●Shift lever: Neutral position
●No-loadIdle 30 - 40 MPa
2,000 rpm 40 - 50 MPa
TERMI-
NAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC Voltage and Pulse Signal)
A23 B Sensor's ground[Engine is running]
●Warm-up condition
●Idle speedApproximately 0V
A27 W Sensor's power supply[Ignition switch "ON"]Approximately 5V
B13
B14Y/R
Y/RCommon rail fuel pressure
sensor[Engine is running]
●Warm-up condition
●Idle speed1.6 - 1.8V
[Engine is running]
●Warm-up condition
●Engine speed is 2,000 rpm1.8 - 2.0V
DTC Malfunction is detected when ... Check Items (Possible Cause)
P0190
●An excessively high or low voltage from the sensor
is entered to ECM.●Harness or connectors (The sensor circuit is open
or shorted.)
●Common rail fuel pressure sensor
SEF817Y

DTC P0190 COMMON RAIL FUEL PRESSURE SENSOR
EC-1469
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Wiring DiagramEBS004RG
TBWA0125E

EC-1470
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DTC P0190 COMMON RAIL FUEL PRESSURE SENSOR
Diagnostic Procedure
EBS004RH
1. CHECK COMMON RAIL FUEL PRESSURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect common rail fuel pressure sensor harness connec-
tor.
3. Turn ignition switch “ON”.
4. Check voltage between common rail fuel pressure sensor termi-
nal 1 and ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 2.
NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
2. CHECK COMMON RAIL FUEL PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Check harness continuity between common rail fuel pressure sensor terminal 3 and engine ground. Refer
to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3. DETECT MALFUNCTIONING PART
Check harness for open or short between ECM and common rail fuel pressure sensor.
>> Repair open circuit or short to ground or short to power in harness or connectors.
PBIB0382E
Voltage: Approximately 5V
PBIB0405E
Continuity should exist.