Nissan Frontier. Instruction — part 589
ELECTRICAL LOAD SIGNAL
EC-927
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
>> INSPECTION END
EC-928
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
FUEL INJECTOR
FUEL INJECTOR
Component Description
INFOID:0000000009481637
The fuel injector is a small, precise solenoid valve. When the ECM
supplies a ground to the fuel injector, the coil in the fuel injector 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 duration.
Pulse duration is the length of time the fuel injector remains open.
The ECM controls the injection pulse duration based on engine fuel
needs.
Diagnosis Procedure
INFOID:0000000009481638
1.
INSPECTION START
Turn ignition switch to START.
Are any cylinders ignited?
Yes or No
Yes (With CONSULT)>>GO TO 2.
Yes (Without CONSULT)>>GO TO 3.
No
>> GO TO 7.
2.
CHECK OVERALL FUNCTION
With CONSULT
1. Start engine.
2. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT.
3. Make sure that each circuit produces a momentary engine speed drop.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 7.
3.
CHECK FUNCTION OF FUEL INJECTOR-I
Without CONSULT
1. Stop engine.
2. Disconnect harness connector F44 (3), F201 (1)
3. Turn ignition switch ON.
4. Check voltage between harness connector F44 terminal 3 and ground with CONSULT or tester.
5. Turn ignition switch OFF.
6. Disconnect ECM harness connector.
7. Check harness continuity between harness connector F44 and ECM as follows.
SEF375Z
2
: Vacuum tank
: Front
AWBIA0686ZZ
Voltage: Battery voltage
FUEL INJECTOR
EC-929
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Refer to Wiring Diagram.
8. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E2, F32
• IPDM E/R harness connector E119
• 15 A fuse (No.55)
• Harness for open or short between harness connector F44 and fuse
• Harness for open or short between harness connector F201 and fuel injector
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK FUNCTION OF FUEL INJECTOR-II
Provide battery voltage between harness connector F201 as follows and then interrupt it. Listen to each fuel
injector operating sound.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 7.
6.
CHECK FUNCTION OF FUEL INJECTOR-III
1. Reconnect all harness connector disconnected.
2. Start engine.
3. Listen to fuel injectors No. 2, No. 4, No.6 operating sound.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 7.
7.
CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT
Cylinder
Harness connector F44
terminal
ECM terminal
1
2
33
3
1
48
5
4
46
Continuity should exist.
Cylinder
Harness connector F201 terminal
(+)
(–)
1
3
2
3
3
1
5
3
4
Operating sound should exist.
Clicking noise should exist.
PBIB1986E
EC-930
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
FUEL INJECTOR
1. Turn ignition switch OFF.
2. Disconnect fuel injector harness connector.
3. Turn ignition switch ON.
4. Check voltage between fuel injector terminal 1 and ground with CONSULT or tester.
OK or NG
OK
>> GO TO 9.
NG
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E2, F32
• Harness connectors F44, F201
• IPDM E/R harness connector E119
• 15 A fuse (No.55)
• Harness for open or short between fuel injector and fuse
>> Repair harness or connectors.
9.
CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between fuel injector terminal 2 and ECM terminals 33, 44, 45, 46, 47, 48.
Refer to Wiring Diagram.
4. 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.
• Harness connectors F201, F44
• Harness for open or short between fuel injector and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
11.
CHECK FUEL INJECTOR
EC-931, "Component Inspection"
OK or NG
OK
>> GO TO 12.
NG
>> Replace fuel injector. Refer to
12.
CHECK INTERMITTENT INCIDENT
BBIA0546E
Voltage: Battery voltage
Continuity should exist.
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