Nissan Frontier D22. Manual - part 359

INJECTOR CIRCUIT

EC-539

[KA24DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

INJECTOR CIRCUIT

PFP:16600

Component Description

UBS00DD4

The fuel injector is a small, precise solenoid valve. When the ECM
supplies a ground to the injector circuit, the coil in the injector is
energized. The energized coil pulls the ball valve back and allows
fuel to flow through the injector into the intake manifold. The amount
of fuel injected depends upon the injection pulse duration. Pulse
duration is the length of time the injector remains open. The ECM
controls the injection pulse duration based on engine fuel needs.

CONSULT-II Reference Value in Data Monitor Mode

UBS00DD5

Specification data are reference values.

SEF812J

MONITOR ITEM

CONDITION

SPECIFICATION

INJ PULSE-B1

●

Engine: After warming up

●

Air conditioner switch: OFF

●

Shift lever: P or N

●

No-load

Idle

2.5 - 3.3 msec

2,000 rpm

2.4 - 3.2 msec

B/FUEL SCHDL

●

Engine: After warming up

●

Air conditioner switch: OFF

●

Shift lever: P or N

●

No-load

Idle

0.8 - 1.2 msec

2,000 rpm

0.8 - 1.2 msec

EC-540

[KA24DE]

INJECTOR CIRCUIT

Wiring Diagram

UBS00DD6

BBWA0459E

INJECTOR CIRCUIT

EC-541

[KA24DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

102
104
109

111

W/B
W/R
W/L
W/PU

Injector No. 1
Injector No. 3
Injector No. 2
Injector No. 4

[Engine is running]

●

Warm-up condition

●

Idle speed

NOTE:
The pulse cycle changes depending on rpm at 
idle.

BATTERY VOLTAGE

(11 - 14V)

[Engine is running]

●

Warm-up condition

●

Engine speed is 2,000 rpm

BATTERY VOLTAGE

(11 - 14V)

SEF011W

SEF012W

EC-542

[KA24DE]

INJECTOR CIRCUIT

Diagnostic Procedure

UBS00DD7

1. 

CHECK OVERALL FUNCTION

 With CONSULT-II

1.

Start engine.

2.

Perform  “POWER BALANCE” in “ACTIVE TEST” mode with
CONSULT-II.

3.

Make sure that each circuit produces a momentary engine
speed drop.

 Without CONSULT-II

1.

Start engine.

2.

Listen to each injector operating sound.
Clicking noise should be heard.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

2. 

CHECK POWER SUPPLY

1.

Stop engine.

2.

Disconnect injector harness connector.

3.

Turn ignition switch ON.

4.

Check voltage between injector terminal 1 and ground with
CONSULT-II or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

SEF981Z

MEC703B

Voltage

: Battery voltage

SEF271W