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START SIGNAL
EC-351
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6.CHECK START SIGNAL INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Disconnect ignition switch harness connector.
3. Check harness continuity between ECM terminal 41 and fuse block (J/B), ignition switch and fuse block
(J/B). Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 8.
NG >> GO TO 7.
7.DETECT MALFUNCTIONING PART
Check the following.
lHarness connectors
lFuse block (J/B) connectors M1, E102
lHarness for open or short between ignition switch and fuse block (J/B)
lHarness for open or short between ECM and fuse block (J/B)
>> Repair open circuit or short to ground or short to power in harness or connectors.
8.CHECK INTERMITTENT INCIDENT
Refer toEC-107, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT".
>>INSPECTION END Continuity should exist.
Page 1466 of 3066
![NISSAN X-TRAIL 2003 Electronic Repair Manual EC-352
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FUEL PUMP CIRCUIT
FUEL PUMP CIRCUIT
PFP:17042
DescriptionEBS00BDL
SYSTEM DESCRIPTION
The ECM activates the fuel pump for several seconds after the ignition switch is turned NISSAN X-TRAIL 2003 Electronic Repair Manual EC-352
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FUEL PUMP CIRCUIT
FUEL PUMP CIRCUIT
PFP:17042
DescriptionEBS00BDL
SYSTEM DESCRIPTION
The ECM activates the fuel pump for several seconds after the ignition switch is turned](/manual-img/5/57402/w960_57402-1465.png)
EC-352
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FUEL PUMP CIRCUIT
FUEL PUMP CIRCUIT
PFP:17042
DescriptionEBS00BDL
SYSTEM DESCRIPTION
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 180°signal from the camshaft position sensor (PHASE), it knows that the
engine is rotating, and causes the pump to operate. If the 180°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 ModeEBS00BDM
Specification data are reference values.
ECM Terminals and Reference ValueEBS00BDN
Specification data are reference values and are measured between each terminal and body 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.
Sensor Input Signal to ECMECM
FunctionActuator
Crankshaft position sensor (POS) Engine speed
Fuel pump
controlFuel pump relay Camshaft position sensor (PHASE) Engine speed and cylinder number
Ignition switch Start signal
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
lFor 1 seconds after turning ignition switch ON
lEngine running or crankingON
lExcept above conditions OFF
Page 1467 of 3066
FUEL PUMP CIRCUIT
EC-353
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TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
29 B/P Fuel pump relay[Ignition switch “ON”]
lFor 1 seconds after turning ignition switch “ON”
[Engineisrunning]0-1.0V
[Ignition switch “ON”]
lMore than 1 seconds after turning ignition switch
“ON”.BATTERY VOLTAGE
(11 - 14V)
Page 1468 of 3066
EC-354
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FUEL PUMP CIRCUIT
Wiring Diagram
EBS00BDO
TBWA0086E
Page 1469 of 3066
FUEL PUMP CIRCUIT
EC-355
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Diagnostic ProcedureEBS00BDP
1.CHECK OVERALL FUNCTION
1. Turn ignition switch “ON”.
2. Pinch fuel feed hose with two fingers.
Fuel pressure pulsation should be felt on the fuel hose for 1
second after ignition switch is turned “ON”.
OK or NG
OK >>INSPECTION END
NG >> GO TO 2.
2.CHECK FUEL PUMP RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect fuel pump relay.
3. Turn ignition switch “ON”.
4. Check voltage between terminals 1, 5 and ground with CON-
SULT-II or tester.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3.DETECT MALFUNCTIONING PART
Check the following.
lFuse block (J/B) connector M1, B4
lHarness or connectors M17, B1
l10A fuse
l15A fuse
lHarness for open or short between fuse and fuel pump relay
>> Repair harness or connectors.
PBIB0517E
PBIB0507E
PBIB0657E
Page 1470 of 3066
![NISSAN X-TRAIL 2003 Electronic Repair Manual EC-356
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FUEL PUMP CIRCUIT
4.CHECK CONDENSER CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch "OFF".
2. Disconnect condenser harness connector.
3. Check harness continuity between NISSAN X-TRAIL 2003 Electronic Repair Manual EC-356
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FUEL PUMP CIRCUIT
4.CHECK CONDENSER CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch "OFF".
2. Disconnect condenser harness connector.
3. Check harness continuity between](/manual-img/5/57402/w960_57402-1469.png)
EC-356
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FUEL PUMP CIRCUIT
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 body ground.
Refer to Wiring Diagram.
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.
lHarness connectors B22, B128 (RHD models)
lHarness for open or short between fuel pump relay and condenser
lHarness for open or short between condenser and body ground
>> Repair open circuit or short to ground or short to power in harness or connectors.
6.CHECK CONDENSER
Refer toEC-357, "
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. Turn ignition switch “OFF”.
2. Disconnect fuel level sensor unit and fuel pump harness con-
nector.
3. Check harness continuity between
fuel pump relay terminal 3 and fuel pump terminal 5,
fuel pump terminal 3 and body ground.
Refer to Wiring Diagram.
4. 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.
lHarness connectors B22, B128 (RHD models)
lHarness for open or short between fuel pump relay and fuel pump
lHarness for open or short between fuel pump and body ground
>> Repair open circuit or short to ground or short to power in harness or connectors. Continuity should exist.
Continuity should exist.
PBIB0506E
Page 1471 of 3066
![NISSAN X-TRAIL 2003 Electronic Repair Manual FUEL PUMP CIRCUIT
EC-357
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9.CHECK FUEL PUMP RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuit NISSAN X-TRAIL 2003 Electronic Repair Manual FUEL PUMP CIRCUIT
EC-357
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9.CHECK FUEL PUMP RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuit](/manual-img/5/57402/w960_57402-1470.png)
FUEL PUMP CIRCUIT
EC-357
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9.CHECK FUEL PUMP RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 29 and fuel 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 11.
NG >> GO TO 10.
10.DETECT MALFUNCTIONING PART
Check the following.
lHarness connectors B1, M17 (LHD models)
lHarness connectors B2, M18 (RHD models)
lHarness connectors M61, F41
lHarness for open or short between ECM and fuel pump relay
>> Repair open circuit or short to ground or short to power in harness or connectors.
11 .CHECK FUEL PUMP RELAY
Refer toEC-357, "
Component Inspection".
OK or NG
OK >> GO TO 12.
NG >> Replace fuel pump relay.
12.CHECK FUEL PUMP
Refer toEC-357, "
Component Inspection".
OK or NG
OK >> GO TO 13.
NG >> Replace fuel pump.
13.CHECK INTERMITTENT INCIDENT
Refer toEC-107, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT".
>>INSPECTION END
Component InspectionEBS00BDQ
FUEL PUMP RELAY
Check continuity between terminals 3 and 5 under the following con-
ditions.Continuity should exist.
Conditions Continuity
12V direct current supply
between terminals 1 and 2Ye s
No current supply No
PBIB0098E
Page 1472 of 3066
EC-358
[QR (WITH EURO-OBD)]
FUEL PUMP CIRCUIT
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 terminals as 1 and 2.
Removal and InstallationEBS00BDR
FUEL PUMP
Refer toFL-4, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY". Resistance: Approximately 1.0W[at 25°C(77°F)]
PBIB0658E
Resistance: Above 1MW[at 25°C(77°F)]
SEF124Y