Nissan Qashqai J11. Manual — part 349
FUEL INJECTOR
ECM-373
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
C
D
E
F
G
H
I
J
K
L
M
A
ECM
N
P
O
4.
Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace malfunctioning part.
3.
CHECK FUEL INJECTOR DRIVER POWER SUPPLY
1.
Disconnect ECM harness connector.
2.
Turn ignition switch ON.
3.
Check the continuity between ECM harness connector and ground.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-41, "Intermittent Incident"
.
NO
>> GO TO 4.
4.
CHECK FUEL INJECTOR DRIVER POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Disconnect fuel injector relay harness connector.
4.
Check the continuity between ECM harness connector and fuel injector relay harness connector.
5.
Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace malfunctioning part.
5.
CHECK FUEL INJECTOR RELAY POWER SUPPLY (CONTACT SIDE)
Check the voltage between fuel injector relay harness connector and ground.
+
−
Continuity
Fuel injector
ECM
Cylinder
Connector
Terminal
Connector
Terminal
1
F29
1
F15
1
Existed
2
F30
1
2
3
F31
1
3
4
F32
1
4
+
−
Voltage
ECM
Connector
Terminal
F16
49
Ground
Battery voltage
53
+
−
Continuity
ECM
Fuel injector relay
Connector
Terminal
Connector
Terminal
F16
49
F49
5
Existed
53
7
+
−
Voltage
Fuel injector relay
Connector
Terminal
F49
3
Ground
Battery voltage
6
ECM-374
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
FUEL INJECTOR
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Perform trouble diagnosis for power supply circuit.
6.
CHECK FUEL INJECTOR RELAY POWER SUPPLY (EXCITATION COIL SIDE)
1.
Install all removed parts.
2.
Turn ignition switch ON.
3.
Check the voltage between fuel injector relay harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> GO TO 7.
7.
CHECK FUEL INJECTOR RELAY POWER SUPPLY (EXCITATION COIL SIDE)
1.
Turn ignition switch OFF.
2.
Disconnect fuel injector relayharness connector.
3.
Disconnect IPDM E/R harness connector.
4.
Check the continuity between IPDM E/R harness connector and fuel injector relay harness connector.
5.
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.
8.
CHECK FUEL INJECTOR RELAY GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect fuel injector relay harness connector.
3.
Check the continuity between fuel injector relay harness connector and ground.
4.
Also check harness for short to ground.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> Repair or replace malfunctioning part.
9.
CHECK FUEL INJECTOR GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between fuel injector harness connector and ECM harness connector.
+
−
Voltage
Fuel injector relay
Connector
Terminal
F49
1
Ground
Battery voltage
+
−
Continuity
IPDM E/R
Fuel injector relay
Connector
Terminal
Connector
Terminal
F90
96
F49
1
Existed
+
−
Continuity
Fuel injector relay
Connector
Terminal
F49
2
Ground
Existed
FUEL INJECTOR
ECM-375
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
C
D
E
F
G
H
I
J
K
L
M
A
ECM
N
P
O
4.
Also check harness for short to ground.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> Repair or replace malfunctioning part.
10.
CHECK FUEL INJECTOR RELAY
Check fuel injector relay. Refer to
ECM-375, "Component Inspection (Fuel Injector Relay)"
.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-41, "Intermittent Incident"
.
NO
>> Replace fuel injector relay.
11.
CHECK FUEL INJECTOR
Check fuel injector. Refer to
ECM-375, "Component Inspection (Fuel Injector)"
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-41, "Intermittent Incident"
.
NO
>> Replace fuel injector. Refer to
EM-164, "Removal and Installation"
.
Component Inspection (Fuel Injector)
INFOID:0000000010703061
1.
CHECK FUEL INJECTOR
1.
Turn ignition switch OFF.
2.
Disconnect fuel injector harness connector.
3.
Check the resistance between fuel injector terminals.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace fuel injector relay.
Component Inspection (Fuel Injector Relay)
INFOID:0000000010703062
1.
CHECK FUEL INJECTOR RELAY
1.
Turn ignition switch OFF.
2.
Remove fuel injector relay.
+
−
Continuity
Fuel injector
ECM
Cylinder
Connector
Terminal
Connector
Terminal
1
F29
2
F15
5
Existed
2
F30
2
6
3
F31
2
7
4
F32
2
8
Fuel injector
Resistance
(Approx.)
+
−
Terminal
1
2
1.44 – 1.73
Ω
[at 10 – 60
°
C (50 –140
°
F)]
ECM-376
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
FUEL INJECTOR
3.
Check the continuity between fuel injector relay terminals as per
the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace fuel injector relay.
+
−
Condition
Continuity
Fuel injector relay
Terminal
3
5
12 V direct current supply between ter-
minals 1 and 2
Existed
No current supply
Not existed
6
7
12 V direct current supply between ter-
minals 1 and 2
Existed
No current supply
Not existed
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