Nissan Frontier. Manual - part 589

 

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Nissan Frontier. Manual - 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

Refer to 

EC-931, "Component Inspection"

.

OK or NG

OK

>> GO TO 12.

NG

>> Replace fuel injector. Refer to 

EM-162, "Exploded View"

.

12.

CHECK INTERMITTENT INCIDENT

BBIA0546E

Voltage: Battery voltage

Continuity should exist.

 

 

 

 

 

 

 

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