Nissan Frontier D40. Manual - part 542

FUEL INJECTOR

EC-859

< COMPONENT DIAGNOSIS >

[VQ40DE]

C

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EC

N

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4.

Check voltage between harness connector F44 terminal 3 and
ground with CONSULT-III or tester.

5.

Turn ignition switch OFF.

6.

Disconnect ECM harness connector.

7.

Check harness continuity between harness connector F44 and
ECM as follows.
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.

Voltage: Battery voltage

Cylinder

Harness connector F44 

terminal

ECM terminal

1

2

23

3

1

22

5

4

21

Continuity should exist.

PBIB2633E

Cylinder

Harness connector F201 terminal

(+)

(–)

1

3

2

3

3

1

5

3

4

Operating sound should exist.

PBIB2634E

EC-860

< COMPONENT DIAGNOSIS >

[VQ40DE]

FUEL INJECTOR

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

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-III 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 21, 22, 23, 40, 41, 42. 
Refer to Wiring Diagram.

4.

Also check harness for short to ground and short to power.

OK or NG

Clicking noise should exist.

PBIB1986E

BBIA0546E

Voltage: Battery voltage

PBIB0582E

Continuity should exist.

FUEL INJECTOR

EC-861

< COMPONENT DIAGNOSIS >

[VQ40DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

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-861, "Component Inspection"

.

OK or NG

OK

>> GO TO 12.

NG

>> Replace fuel injector.

12.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-46, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000005273878

FUEL INJECTOR

1.

Disconnect injector harness connector.

2.

Check resistance between terminals as shown in the figure.

Resistance: 11.1 - 14.5

Ω

 [at 10 - 60

°

C (50 - 140

°

F)]

PBIB1727E

EC-862

< COMPONENT DIAGNOSIS >

[VQ40DE]

FUEL PUMP

FUEL PUMP

Description

INFOID:0000000005273879

SYSTEM DESCRIPTION

*: ECM determines the start signal status by the signals of engine speed and battery voltage.

The ECM activates the fuel pump for several seconds after the ignition switch is turned ON to improve engine
start ability. If the ECM receives a engine speed signal from the camshaft position sensor (PHASE), it knows
that the engine is rotating, and causes the pump to operate. If the engine speed signal is not received when
the ignition switch is ON, the engine stalls. The ECM stops pump operation and prevents battery discharging,
thereby improving safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump
relay, which in turn controls the fuel pump.

COMPONENT DESCRIPTION

A turbine type design fuel pump is used in the fuel tank.

Diagnosis Procedure

INFOID:0000000005273880

1.

CHECK OVERALL FUNCTION

1.

Turn ignition switch ON.

2.

Pinch fuel feed hose with two fingers.
Fuel pressure pulsation should be felt on the fuel feed hose
for 1 second after ignition switch is turned ON.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

2.

CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Turn ignition switch ON.

Sensor

Input Signal to ECM

ECM Function

Actuator

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed*

Fuel pump control

Fuel pump relay

Battery

Battery voltage*

Condition

Fuel pump operation

Ignition switch is turned to ON.

Operates for 1 second.

Engine running and cranking

Operates.

When engine is stopped

Stops in 1.5 seconds.

Except as shown above

Stops.

PBIB1569E

BBIA0563E