Nissan X-Trail 32. Instruction — part 816
LOW PRESSURE FUEL PUMP
EC-393
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace “fuel level sensor unit and fuel pump”. Refer to
FL-12, "Removal and Installation"
.
Fuel level sensor unit and fuel pump
Resistance
+
−
Terminal
1
3
0.2 - 5.0
Ω
[at 25
°
C (77
°
F)]
EC-394
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
HIGH PRESSURE FUEL PUMP
HIGH PRESSURE FUEL PUMP
Component Function Check
INFOID:0000000010775285
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
.
Diagnosis Procedure
INFOID:0000000010775286
1.
CHECK HIGH PRESSURE FUEL PUMP POWER SUPPLY
1.
Turn ignition switch ON.
2.
Check the voltage between ECM harness connector and ground.
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
F8
51
54
[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
F8
50
Ground
Battery voltage
HIGH PRESSURE FUEL PUMP
EC-395
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> GO TO 2.
2.
CHECK HIGH PRESSURE FUEL PUMP POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Disconnect high pressure fuel pump relay harness connector.
4.
Check the continuity between ECM harness connector and high pressure fuel pump relay harness con-
nector.
5.
Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace malfunctioning part.
3.
CHECK HIGH PRESSURE FUEL PUMP RELAY POWER SUPPLY (CONTACT SIDE)
Check the voltage between high pressure fuel pump relay harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Perform the trouble diagnosis for power supply circuit.
4.
CHECK HIGH PRESSURE FUEL PUMP RELAY POWER SUPPLY (EXCITATION COIL SIDE)
1.
Install all removed parts.
2.
Turn ignition switch ON.
3.
Check the voltage between high pressure fuel pump relay harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
CHECK HIGH PRESSURE FUEL PUMP RELAY POWER SUPPLY CIRCUIT (EXCITATION COIL SIDE)
1.
Turn ignition switch OFF.
2.
Disconnect high pressure fuel pump relay harness connector.
3.
Disconnect IPDM E/R harness connector.
4.
Check the continuity between IPDM E/R harness connector and high pressure fuel pump relay harness
connector.
+
−
Continuity
ECM
High pressure fuel pump re-
lay
Connector
Terminal
Connector
Terminal
F8
50
F58
5
Existed
+
−
Voltage
High pressure fuel pump relay
Connector
Terminal
F58
3
Ground
Battery voltage
+
−
Voltage
High pressure fuel pump relay
Connector
Terminal
F58
1
Ground
Battery voltage
EC-396
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
HIGH PRESSURE FUEL PUMP
5.
Also check harness for short to power.
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for power supply circuit.
NO
>> Repair or replace malfunctioning part.
6.
CHECK HIGH PRESSURE FUEL PUMP RELAY GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect high pressure fuel pump relay harness connector.
3.
Check the continuity between high pressure fuel pump relay harness connector and ground.
4.
Also check harness for short to ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair or replace malfunctioning part.
7.
CHECK HIGH PRESSURE FUEL PUMP RELAY
Check high pressure fuel pump relay. Refer to
EC-398, "Component Inspection (High Pressure Fuel Pump
.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Replace high pressure fuel pump relay. Refer to
PG-91, "LHD : Engine Room Harness"
for relay location.
8.
CHECK HIGH PRESSURE FUEL PUMP CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector and high pressure fuel pump relay harness connector.
3.
Check the continuity between ECM harness connector and high pressure fuel pump harness connector.
4.
Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Repair or replace malfunctioning part.
9.
CHECK HIGH PRESSURE FUEL PUMP
Check high pressure fuel pump. Refer to
EC-397, "Component Inspection (High Pressure Fuel Pump)"
.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> Replace high pressure fuel pump. Refer to
+
−
Continuity
IPDM E/R
High pressure fuel pump re-
lay
Connector
Terminal
Connector
Terminal
F72
66
F58
1
Existed
+
−
Continuity
High pressure fuel pump relay
Connector
Terminal
F58
2
Ground
Existed
+
−
Continuity
ECM
High pressure fuel pump
Connector
Terminal
Connector
Terminal
F8
51
F115
1
Existed
52
2
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