Nissan Qashqai (2007-2010). Manual — part 350
ELECTRICAL LOAD SIGNAL
EC-919
< COMPONENT DIAGNOSIS >
[MR20DE (WITH EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
>> INSPECTION END
3.
CHECK HEADLAMP SYSTEM
(XENON TYPE) or
(HALOGEN TYPE).
>> INSPECTION END
4.
CHECK HEATER FAN CONTROL SYSTEM
GI-39, "Intermittent Incident"
.
>> INSPECTION END
EC-920
< COMPONENT DIAGNOSIS >
[MR20DE (WITH EURO-OBD)]
FUEL INJECTOR
FUEL INJECTOR
Description
INFOID:0000000001089523
The fuel injector is a small, precise solenoid valve. When the ECM
supplies a ground to the fuel injector circuit, the coil in the fuel injec-
tor is energized. The energized coil pulls the ball valve back and
allows fuel to flow through the fuel injector into the intake manifold.
The amount of fuel injected depends upon the injection pulse dura-
tion. Pulse duration is the length of time the fuel injector remains
open. The ECM controls the injection pulse duration based on
engine fuel needs.
Component Function Check
INFOID:0000000001089524
1.
INSPECTION START
Turn ignition switch to START.
Is any cylinder ignited?
YES
>> GO TO 2.
NO
>> Go to
2.
CHECK FUEL INJECTOR FUNCTION
With CONSULT-III
1.
Start engine.
2.
Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-III.
3.
Make sure that each circuit produces a momentary engine speed drop.
Without CONSULT-III
1.
Let engine idle.
2.
Listen to each fuel injector operating sound.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000001089525
1.
CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect fuel injector harness connector.
3.
Turn ignition switch ON.
4.
Check the voltage between fuel injector harness connector and ground.
PBIA9664J
Clicking noise should be heard.
PBIB3332E
FUEL INJECTOR
EC-921
< COMPONENT DIAGNOSIS >
[MR20DE (WITH EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors F123, E6
• 10A fuse (No. 58)
• Harness for open or short between fuel injector and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
3.
CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between fuel injector harness connector and ECM harness connector.
4.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK FUEL INJECTOR
EC-924, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace malfunctioning fuel injector.
5.
CHECK INTERMITTENT INCIDENT
GI-39, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace IPDM E/R.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
Component Inspection
INFOID:0000000001089526
1.
CHECK FUEL INJECTOR
1.
Turn ignition switch OFF.
2.
Disconnect fuel injector harness connector.
3.
Check resistance between fuel injector terminals as follows.
Fuel injector
Ground
Voltage
Cylinder
Connector
Terminal
1
F37
1
Ground
Battery voltage
2
F38
1
3
F39
1
4
F40
1
Fuel injector
ECM
Continuity
Cylinder
Connector
Terminal
Connector
Terminal
1
F37
2
F7
31
Existed
2
F38
2
30
3
F39
2
29
4
F40
2
25
EC-922
< COMPONENT DIAGNOSIS >
[MR20DE (WITH EURO-OBD)]
FUEL INJECTOR
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace malfunctioning fuel injector.
Terminals
Resistance [at 10 - 60
°
C (50 - 140
°
F)]
1 and 2
11.1 - 14.5
Ω
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