Nissan Titan A60. Manual - part 444

EC-442

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

ELECTRICAL LOAD SIGNAL

>> INSPECTION END

FUEL INJECTOR

EC-443

< DTC/CIRCUIT DIAGNOSIS >

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FUEL INJECTOR

Component Description

INFOID:0000000006158926

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.

Diagnosis Procedure

INFOID:0000000006158927

1.

INSPECTION START

Turn ignition switch to START.

Is any cylinder ignited?
Yes or No

Yes

>> GO TO 2.

No

>> GO TO 3.

2.

CHECK OVERALL 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. Start engine.

2. Listen to each fuel injector operating sound.

Clicking noise should be heard.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 3.

3.

CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect fuel injector harness connector.

3. Turn ignition switch ON.

SEF375Z

PBIB1986E

BBIA0374E

EC-444

< DTC/CIRCUIT DIAGNOSIS >

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FUEL INJECTOR

4. Check voltage between fuel injector terminal 1 and ground with

CONSULT-III or tester.

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 connector E119

• 15A fuse

• Harness for open or short between fuel injector and fuse

>> Repair harness or connectors.

5.

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, 44,

63. 

Refer to Wiring Diagram.

4. Also check harness for short to ground and short to power.
OK or NG

OK

>> GO TO 6.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

6.

CHECK FUEL INJECTOR

Refer to 

EC-444, "Component Inspection"

.

OK or NG

OK

>> GO TO 7.

NG

>> Replace malfunctioning fuel injector.

7.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "How to Check Terminal"

 and 

GI-39, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000006158928

FUEL INJECTOR

1. Disconnect fuel injector harness connector.

Voltage: Battery voltage

PBIB0582E

Continuity should exist.

FUEL INJECTOR

EC-445

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2. Check resistance between terminals as shown in the figure.

Resistance: 11.1 - 14.5

Ω [at 10 - 60°C (50 - 140°F)]

PBIB1727E