2005 NISSAN X-TRAIL sensor

EC-906
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FUEL PUMP CIRCUIT

FUEL PUMP CIRCUITPFP:17042
DescriptionEBS0114O
SYSTEM DESCRIPTION
*: ECM determines the start signal status by the signals of engine speed and battery voltage.
The ECM activates the fuel pump for several seconds after the ignition switch is turned ON to improve engine
startability. If the ECM receives a engine speed signal from the crankshaft position sensor (POS) and cam-
shaft position sensor (PHASE), it knows that the engine is rotating, and causes the pump to operate. If the
engine speed signal is not received when the ignition switch is ON, the engine stalls. The ECM stops pump
operation and prevents battery discharging, thereby improving safety. The ECM does not directly drive the fuel
pump. It controls the ON/OFF fuel pump relay, which in turn controls the fuel pump.
COMPONENT DESCRIPTION
A turbine type design fuel pump is used in the fuel tank.
CONSULT-II Reference Value in Data Monitor ModeEBS0114P
Specification data are reference values.
Sensor Input Signal to ECM ECM Function Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)Engine speed*
Fuel pump control Fuel pump relay
Battery Battery voltage*
Condition Fuel pump operation
Ignition switch is turned to ON Operates for 1 second
Engine running and crankingOperates
When engine is stoppedStops in 1.5 seconds
Except as shown aboveStops
PBIB0513E
MONITOR ITEM CONDITION SPECIFICATION
FUEL PUMP RLY

For 1 second after turning ignition switch ON

Engine running or crankingON

Except above conditions OFF

FUEL PUMP CIRCUIT
EC-911
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3. DETECT MALFUNCTIONING PART
Check the following.

Harness connectors M17, B1

Fuse block (J/B) connector M1

15A fuse

Harness for open or short between fuel pump relay and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK CONDENSER CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect condenser harness connector.
3. Check harness continuity between fuel pump relay terminal 3 and condenser terminal 1, condenser termi-
nal 2 and ground.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.
5. DETECT MALFUNCTIONING PART
Check the following.

Harness connectors B22, B128 (RHD models)

Harness for open or short between fuel pump relay and condenser

Harness for open or short between condenser and ground
>> Repair open circuit or short to ground or short to power in harness connectors.
6. CHECK CONDENSER
Refer to EC-913, "
Component Inspection" .
OK or NG
OK >> GO TO 7.
NG >> Replace condenser.
7. CHECK FUEL PUMP POWER SUPPLY AND GROUND CIRCUIT FOR OPEN AND SHORT
1. Disconnect “fuel level sensor unit and fuel pump” harness con-
nector.
2. Check harness continuity between fuel pump relay terminal 3
and “fuel level sensor unit and fuel pump” terminal 5, “fuel level
sensor unit and fuel pump” terminal 3 and ground.
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.Continuity should exist.
Continuity should exist.PBIB0506E

EC-912
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FUEL PUMP CIRCUIT

8. DETECT MALFUNCTIONING PART
Check the following.

Harness connectors B22, B128 (RHD models)

Harness for open or short between fuel pump relay and “fuel level sensor unit and fuel pump”

Harness for open or short between “fuel level sensor unit and fuel pump” and ground
>> Repair open circuit or short to ground or short to power in harness connectors.
9. CHECK FUEL PUMP RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between fuel pump relay terminal 2 and ECM terminal 114.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 11.
NG >> GO TO 10.
10. DETECT MALFUNCTIONING PART
Check the following.

Harness connectors B1, M17 (LHD models)

Harness connectors B2, M18 (RHD models)

Harness for open or short between fuel pump relay and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
11 . CHECK FUEL PUMP RELAY
Refer to EC-913, "
Component Inspection" .
OK or NG
OK >> GO TO 12.
NG >> Replace fuel pump relay.
12. CHECK FUEL PUMP
Refer to EC-913, "
Component Inspection" .
OK or NG
OK >> GO TO 13.
NG >> Replace fuel pump.
13. CHECK INTERMITTENT INCIDENT
Refer to EC-624, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END Continuity should exist.

FUEL PUMP CIRCUIT
EC-913
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Component InspectionEBS0114S
FUEL PUMP RELAY
Check continuity between terminals 3 and 5 under the following con-
ditions.
FUEL PUMP
1. Disconnect “fuel level sensor unit and fuel pump” harness connector.
2. Check resistance between “fuel level sensor unit and fuel pump”
terminals 3 and 5.
CONDENSER
1. Turn ignition switch OFF.
2. Disconnect condenser harness connector.
3. Check resistance between condenser terminal 1 and 2.
Removal and InstallationEBS011UV
FUEL PUMP
Refer to FL-4, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY" .
Conditions Continuity
12V direct current supply between terminals
1 and 2Ye s
No current supply No
PBIB0098E
Resistance: Approximately 0.2 - 5.0Ω [at 25°C (77°F)]
PBIB0658E
Resistance: Above 1MΩ [at 25°C (77°F)]
MBIB0031E

EC-914
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REFRIGERANT PRESSURE SENSOR

REFRIGERANT PRESSURE SENSORPFP:92136
Component DescriptionEBS0114U
The refrigerant pressure sensor is installed at the condenser of the
air conditioner system. The sensor uses an electrostatic volume
pressure transducer to convert refrigerant pressure to voltage. The
voltage signal is sent to ECM, and ECM controls cooling fan system.
PBIB0503E
PBIB2657E

REFRIGERANT PRESSURE SENSOR
EC-915
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Wiring DiagramEBS0114V
TBWA0634E

EC-916
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REFRIGERANT PRESSURE SENSOR

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.
Diagnostic ProcedureEBS0114W
1. CHECK REFRIGERANT PRESSURE SENSOR OVERALL FUNCTION
1. Start engine and warm it up to normal operating temperature.
2. Turn A/C switch and blower switch ON.
3. Check voltage between ECM terminal 69 and ground with CON-
SULT-II or tester.
OK or NG
OK >>INSPECTION END
NG >> GO TO 2.
TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
46 RSensor power supply
(Refrigerant pressure sensor)[Ignition switch: ON]Approximately 5V
57 B Sensor ground[Engine is running]

Warm-up condition

Idle speedApproximately 0V
69 L Refrigerant pressure sensor[Engine is running]

Warm-up condition

Both A/C switch and blower switch are ON
(Compressor operates.)1.0 - 4.0V
Voltage: 1.0 - 4.0V
MBIB0035E

REFRIGERANT PRESSURE SENSOR
EC-917
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2. CHECK GROUND CONNECTIONS
1. Turn A/C switch and blower switch OFF.
2. Stop engine.
3. Loosen and retighten three ground screws on the body.
Refer to EC-632, "
Ground Inspection" .
OK or NG
OK >> GO TO 3.
NG >> Repair or replace ground connections.
PBIB2021E