Nissan Qashqai J11. Manual — part 350
LOW PRESSURE FUEL PUMP
ECM-377
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
C
D
E
F
G
H
I
J
K
L
M
A
ECM
N
P
O
LOW PRESSURE FUEL PUMP
Component Function Check
INFOID:0000000010703063
1.
CHECK LOW PRESSURE FUEL PUMP FUNCTION
1.
Turn ignition switch ON.
2.
Pinch fuel feed hose
with two fingers.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
ECM-377, "Diagnosis Procedure"
.
Diagnosis Procedure
INFOID:0000000010703064
1.
CHECK FUEL PUMP RELAY POWER SUPPLY
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Turn ignition switch ON.
4.
Check the voltage between ECM harness connector terminals.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK FUEL PUMP RELAY POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect IPDM E/R harness connector.
3.
Check the continuity between ECM harness connector and IPDM E/R harness connector.
4.
Also check harness for short to power.
Is the inspection result normal?
YES
>> Perform trouble diagnosis for power supply circuit.
NO
>> Repair or replace malfunctioning part.
3.
CHECK FUEL PUMP POWER SUPPLY
1.
Turn ignition switch OFF.
2.
Reconnect ECM harness connector.
3.
Disconnect “fuel level sensor unit and fuel pump” harness connector.
4.
Turn ignition switch ON.
5.
Check the voltage between “fuel level sensor unit and fuel pump” harness connector and ground.
Fuel pressure pulsation should be felt on the fuel
feed hose for 1 second after ignition switch is
turned ON.
JSBIA0601ZZ
+
−
Voltage
ECM
Connector
Terminal
Connector
Terminal
F16
87
E57
128
Battery voltage
+
−
Continuity
ECM
IPDM E/R
Connector
Terminal
Connector
Terminal
F16
87
F90
106
Existed
ECM-378
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
LOW PRESSURE FUEL PUMP
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 4.
4.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect IPDM E/R harness connector.
3.
Check the continuity between “fuel level sensor unit and fuel pump” harness connector and IPDM E/R
harness connector.
4.
Also check harness for short to power.
Is the inspection result normal?
YES
>> Perform trouble diagnosis for power supply circuit.
NO
>> Repair or replace malfunctioning part.
5.
CHECK FUEL PUMP GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Check the continuity between “fuel level sensor unit and fuel pump” harness connector and ground.
3.
Also check harness for short to ground and to power.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace malfunctioning part.
6.
CHECK FUEL PUMP
Check fuel pump. Refer to
ECM-378, "Component Inspection (Fuel Pump)"
.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-41, "Intermittent Incident"
.
NO
>> Replace “fuel level sensor unit and fuel pump”. Refer to
FL-19, "Removal and Installation"
.
Component Inspection (Fuel Pump)
INFOID:0000000010703065
1.
CHECK FUEL PUMP
1.
Turn ignition switch OFF.
2.
Disconnect “fuel level sensor unit and fuel pump” harness connector.
3.
Check the resistance between “fuel level sensor unit and fuel pump” terminals as follows.
+
−
Voltage
Fuel level sensor unit and fuel
pump
Connector
Terminal
B72
1
Ground
Battery voltage should exist 1 second after igni-
tion switch is turn ON.
+
−
Continuity
Fuel level sensor unit and fuel
pump
IPDM E/R
Connector
Terminal
Connector
Terminal
B72
1
E39
48
Existed
+
−
Continuity
Fuel level sensor unit and fuel pump
Connector
Terminal
B72
3
Ground
Existed
LOW PRESSURE FUEL PUMP
ECM-379
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
C
D
E
F
G
H
I
J
K
L
M
A
ECM
N
P
O
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace “fuel level sensor unit and fuel pump”. Refer to
FL-19, "Removal and Installation"
.
Fuel level sensor unit and fuel pump
Resistance
+
−
Terminal
1
3
0.2 - 5.0
Ω
[at 25
°
C (77
°
F)]
ECM-380
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
HIGH PRESSURE FUEL PUMP
HIGH PRESSURE FUEL PUMP
Component Function Check
INFOID:0000000010703066
1.
CHECK HIGH PRESSURE FUEL PUMP FUNCTION
With CONSULT
1.
Start engine.
2.
Select “FUEL PRES SEN V” in “DATA MONITOR” mode of “ENGINE” using CONSULT and check the
indication as per the following conditions.
Without CONSULT
1.
Start engine.
2.
Check the voltage between ECM terminals as per the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
ECM-380, "Diagnosis Procedure"
.
Diagnosis Procedure
INFOID:0000000010703067
1.
CHECK HIGH PRESSURE FUEL PUMP POWER SUPPLY
1.
Turn ignition switch ON.
2.
Check the voltage between ECM harness connector and ground.
Is the inspection result normal?
Monitor item
Condition
Indication
FUEL PRES SEN V
At idle
820 - 1,140 mV
Revving engine up to 4,000 rpm quickly.
820 - 2,900 mV
ECM
Condition
Voltage
Voltage
+
−
Terminal
F16
51
52
[Engine is running]
• Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes depending on
rpm at idle.
Battery voltage
(11 - 14 V)
[Engine is running]
• Warm-up condition
• Engine speed: 2,000 rpm
Battery voltage
(11 - 14 V)
JPBIA4722ZZ
JPBIA4723ZZ
+
−
Voltage
ECM
Connector
Terminal
F16
50
Ground
Battery voltage
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