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![NISSAN X-TRAIL 2003 Service Repair Manual FUEL TRANSPORT PUMP
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FUEL TRANSPORT PUMPPFP:17020
DescriptionEBS0126G
SYSTEM DESCRIPTION
Fuel supply entrance of fuel tank is at the left sid NISSAN X-TRAIL 2003 Service Repair Manual FUEL TRANSPORT PUMP
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FUEL TRANSPORT PUMPPFP:17020
DescriptionEBS0126G
SYSTEM DESCRIPTION
Fuel supply entrance of fuel tank is at the left sid](/manual-img/5/57404/w960_57404-1864.png)
FUEL TRANSPORT PUMP
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FUEL TRANSPORT PUMPPFP:17020
DescriptionEBS0126G
SYSTEM DESCRIPTION
Fuel supply entrance of fuel tank is at the left side of fuel tank. The duel at the right side of the fuel tank is sent
to the left side of the fuel tank by fuel transport pump.
When the ECM receives engine revolution signal from the crankshaft position sensor, it knows that the engine
is rotating, and causes the pump operate. If the remainder of the fuel at the right side of the fuel tank
decreases, fuel level switch sends a signal to the ECM. When the ECM receives a signal from the fuel level
switch, the ECM stops the operation of the pump.
The ECM does not directly drive the fuel transport pump. It controls the ON/OFF fuel transport pump relay,
which in turn controls the fuel transport pump.
COMPONENT DESCRIPTION
Fuel Transport Pump
Fuel transport pump sends the fuel from right side of fuel tank to left
side.
Fuel Level Switch
Fuel level switch is assembled in sub fuel level sensor unit. When the remainder of the fuel at the right side of
the fuel tank is less than specified value, the switch is turned OFF.
Sensor Input Signal to ECM ECM function Actuator
Crankshaft position sensor Engine speed
Fuel transport pump control Fuel transport pump relay
Fuel level switch Fuel level
Condition Fuel transport pump operation
Engine is running.Operates
Engine is stopped.Stops
The remainder of the fuel in the fuel tank is less than specified value. Stops
PBIB1887E
PBIB0469E
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EC-1488
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FUEL TRANSPORT PUMP
ECM Terminals and Reference ValueEBS0126H
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)
14 W/PU Fuel level switch[Ignition switch ON]
Some fuel is in the fuel tankApproximately 0V
[Ignition switch ON]
No fuel is in the fuel tankBATTERY VOLTAGE
(11 - 14V)
39 B/OR Fuel transport pump relay[Engine is running]
Some fuel is in the fuel tankApproximately 0V
[Engine is running]
No fuel is in the fuel tankBATTERY VOLTAGE
(11 - 14V)
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FUEL TRANSPORT PUMP
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Wiring DiagramEBS0126I
LHD MODELS
TBWA0590E
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FUEL TRANSPORT PUMP
RHD MODELS
TBWA0591E
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FUEL TRANSPORT PUMP
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Diagnostic ProcedureEBS0126J
1. CHECK OVERALL FUNCTION
1. Turn ignition switch OFF.
2. Confirm that the engine is cooled down and there are no fire hazards near the vehicle.
3. Disconnect sub fuel level sensor unit harness connector.
4. Remove sub fuel level sensor unit.
5. Reconnect sub fuel level sensor unit harness connector.
6. Soak fuel level switch in fuel and check operating sound of fuel
transport pump.
OK or NG
OK >>INSPECTION END
NG >> GO TO 2.
2. CHECK FUEL TRASPORT PUMP FUNCTION
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Install suitable harness between ECM harness connector termi-
nal 39 and ground.
4. Turn ignition switch ON.
5. Listen the fuel transport pump operating sound.
OK or NG
OK >> GO TO 11.
NG >> GO TO 3.
PBIB1944E
Operating sound should exist.
PBIB2015E
Operating sound should exist.
PBIB2016E
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![NISSAN X-TRAIL 2003 Service Repair Manual EC-1492
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FUEL TRANSPORT PUMP
3. CHECK FUEL TRASPORT PUMP RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Reconnect ECM harness connector.
3. Disconnect fuel transpo NISSAN X-TRAIL 2003 Service Repair Manual EC-1492
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FUEL TRANSPORT PUMP
3. CHECK FUEL TRASPORT PUMP RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Reconnect ECM harness connector.
3. Disconnect fuel transpo](/manual-img/5/57404/w960_57404-1869.png)
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FUEL TRANSPORT PUMP
3. CHECK FUEL TRASPORT PUMP RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Reconnect ECM harness connector.
3. Disconnect fuel transport pump relay.
4. Turn ignition switch ON.
5. Check voltage between fuel transport pump relay terminals 1, 5
and ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 5.
NG >> GO TO 4.
4. DETECT MALFUNCTIONING PERT
Check the following.
Harness connectors M17, B1
Fuse block (J/B) connectors M1
15A fuse
Harness for open or short between fuse and fuel transport pump relay
>> Repair harness or connectors.
5. CHECK FUEL TRANSPORT PUMP POWER SUPPLY AND GROUND CIRCUIT FOR OPEN AND
SHORT
1. Turn ignition switch OFF.
2. Disconnect fuel transport pump harness connector.
3. Check harness continuity between fuel transport pump relay ter-
minal 3 and fuel transport pump terminal 1 and between fuel
transport pump terminal 2 and 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.
PBIB1933E
Voltage: Battery voltage
PBIB0471E
Continuity should exist.
PBIB1931E
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6. DETECT MALFUNCTIONING PART
Check the following.
Harness connector B22, B128
Harness for open or short between fuel NISSAN X-TRAIL 2003 Service Repair Manual FUEL TRANSPORT PUMP
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6. DETECT MALFUNCTIONING PART
Check the following.
Harness connector B22, B128
Harness for open or short between fuel](/manual-img/5/57404/w960_57404-1870.png)
FUEL TRANSPORT PUMP
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6. DETECT MALFUNCTIONING PART
Check the following.
Harness connector B22, B128
Harness for open or short between fuel transport pump relay and fuel transport pump
Harness for open or short between fuel transport pump and ground
>> Repair open circuit or short to ground or short to power in harness or connectors.
7. CHECK FUEL TRANSPORT PUMP RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 39 and fuel transport pump 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 >> GO TO 8.
8. DETECT MALFUNSTIONING PART
Check the following.
Harness connector M17, B1 (LHD models)
Harness connector M18, B2 (RHD models)
Harness connector M63, F30
Harness for open or short between ECM and fuel transport pump relay
>> Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK FUEL TRANSPORT PUMP RELAY
Refer to EC-1494, "
Component Inspection" .
OK or NG
OK >> GO TO 10.
NG >> Replace fuel transport pump relay.
10. CHECK TRANSPORT PUMP
Refer to EC-1494, "
Component Inspection" .
OK or NG
OK >> GO TO 14.
NG >> Replace fuel transport pump.Continuity should exist.
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![NISSAN X-TRAIL 2003 Service Repair Manual EC-1494
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11 . CHECK FUEL LEVEL SWITCH POWER SUPPLY AND GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector. NISSAN X-TRAIL 2003 Service Repair Manual EC-1494
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FUEL TRANSPORT PUMP
11 . CHECK FUEL LEVEL SWITCH POWER SUPPLY AND GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.](/manual-img/5/57404/w960_57404-1871.png)
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11 . CHECK FUEL LEVEL SWITCH POWER SUPPLY AND GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect sub fuel level sensor unit harness connector.
4. Check harness continuity between ECM terminal 14 and sub
fuel level sensor unit terminal 2, between sub fuel level sensor
unit terminal 4 and ground. Refer to Wiring Diagram.
5. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 9.
NG >> GO TO 8.
12. DETECT MALFUNCTIONING PART
Check the following.
Harness connector F30, M63
Harness connector M78, B105 (LHD models)
Harness connectors M18, B2 (RHD models)
Harness for open or short between sub fuel level sensor unit and ground.
>> Repair open circuit or short to ground or short to power in harness or connectors.
13. CHECK FUEL LEVEL SWITCH
Refer to EC-1494, "
Component Inspection"
OK or NG
OK >> GO TO 14.
NG >> Replace sub fuel level sensor unit.
14. CHECK INTERMITTENT INCIDENT
Refer to EC-1260, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>>INSPECTION END
Component InspectionEBS0126K
FUEL TRANSPORT PUMP RELAY
Check continuity between terminals 3 and 5 under the following coni-
tions.Continuity should exist.
PBIB1944E
Conditions Continuity
12V direct current supply between terminals 1 and 2 Yes
No current supply No
PBIB0098E