Nissan Frontier. Manual - part 701

ENGINE CONTROL SYSTEM SYMPTOMS

EC-1375

< SYMPTOM DIAGNOSIS >

[VQ40DE FOR MEXICO]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

SYMPTOM

Reference 
page

HARD/NO ST

AR

T/REST

AR

T (EXCP

. 

HA)

E

N

GI

N

E

 ST

AL

L

HESIT

A

TION/S

U

R

GING/F

LA

T SP

OT

SP

ARK KNOCK/DE

T

O

NA

TION

LACK OF POWE

R/POOR

 ACCELERA

TIO

N

HIGH IDL

E/L

OW

 IDL

E

ROUG

H IDLE/HU

NTING

IDL

ING VIBRA

T

ION

SLO

W

/NO RETURN T

O

 IDLE

OVERHEA

T

S/W

A

TE

R

 TEMPERA

T

URE 

HIGH

EXCES

SIVE F

U

EL CONSUMP

T

ION

EXCES

SIVE OI

L CONSUMP

T

IO

N

BA

TTE

R

Y 

DEAD (UN

D

E

R

 CH

A

R

GE)

Warranty symptom code

AA

AB

AC

AD

AE

AF

AG AH

AJ

AK

AL

AM HA

Fuel

Fuel tank

5

5

FL-6

Fuel piping

5

5

5

5

5

5

FL-5

Vapor lock

—

Valve deposit

5

5

5

5

5

5

5

—

Poor fuel (Heavy weight gasoline, 
Low octane)

—

Air

Air duct

5

5

5

5

5

5

EM-141

Air cleaner

EM-141

Air leakage from air duct
(Mass air flow sensor — electric 
throttle control actuator)

5

5

5

5

EM-141

Electric throttle control actuator

EM-142

Air leakage from intake manifold/
Collector/Gasket

EM-142

, 

EM-145

Cranking

Battery

1

1

1

1

1

1

1

1

PG-4

Generator circuit

CHG-2

, 

CHG-5

Starter circuit

3

STR-6

, 

STR-10

Signal plate

6

EM-230

TCM

4

TM-170

Engine

Cylinder head

5

5

5

5

5

5

5

5

EM-211

Cylinder head gasket

4

3

Cylinder block

6

6

6

6

6

6

6

6

4

EM-230

Piston

Piston ring

Connecting rod

Bearing

Crankshaft

EC-1376

< SYMPTOM DIAGNOSIS >

[VQ40DE FOR MEXICO]

ENGINE CONTROL SYSTEM SYMPTOMS

1 - 6: The numbers refer to the order of inspection.

Valve 
mecha-
nism

Timing chain

5

5

5

5

5

5

5

5

EM-176

Camshaft

EM-193

Intake valve timing control

EM-205

Intake valve

3

EM-211

Exhaust valve

Exhaust

Exhaust manifold/Tube/Muffler/
Gasket

5

5

5

5

5

5

5

5

EM-148

, 

EX-4

Three way catalyst

Lubrica-
tion

Oil pan/Oil strainer/Oil pump/Oil 
filter/Oil gallery/Oil cooler

5

5

5

5

5

5

5

5

EM-151

, 

LU-27

, 

LU-

30

, 

Oil level (Low)/Filthy oil

LU-22

Cooling

Radiator/Hose/Radiator filler cap

5

5

5

5

5

5

5

4

5

CO-39

Thermostat

5

CO-55

Water pump

CO-50

Water gallery

CO-57

Cooling fan

5

CO-47

Coolant level (Low)/Contaminat-
ed coolant

5

CO-39

NVIS (NISSAN Vehicle Immobilizer System — 
NATS)

1

1

SEC-3

SYMPTOM

Reference 
page

HARD/NO S

TA

R

T/RES

TA

R

T (E

XCP

. HA)

E

N

GINE

 ST

ALL

HES

IT

A

TION/SURGING/FLA

T

 SPOT

S

P

ARK KNOC

K

/DET

O

NA

TI

ON

LACK OF 

POWER/POOR ACCELERA

TION

HIG

H

 IDL

E

/L

OW

 ID

LE

ROUGH IDLE/HUNTING

ID

LING VI

BRA

T

ION

S

LOW/NO RETU

RN 

T

O ID

LE

OVERHEA

T

S

/W

A

TER TEMPERA

T

URE HIG

H

E

XCESSIVE

 FUEL CON

S

UMP

T

ION

E

XCESSIVE

 OIL 

C

O

NSUMP

T

ION

B

A

TTER

Y 

DEAD (UNDER CHARGE)

Warranty symptom code

AA

AB

AC

AD

AE

AF

AG AH

AJ

AK

AL

AM HA

NORMAL OPERATING CONDITION

EC-1377

< SYMPTOM DIAGNOSIS >

[VQ40DE FOR MEXICO]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

NORMAL OPERATING CONDITION

Fuel Cut Control (at No Load and High Engine Speed)

INFOID:0000000009482050

INPUT/OUTPUT SIGNAL CHART

*: This signal is sent to the ECM through CAN communication line.

SYSTEM DESCRIPTION

If the engine speed is above 1,800 rpm under no load (for example, the shift position is neutral and engine

speed is over 1,800 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off varies

based on engine speed.

Fuel cut will be operated until the engine speed reaches 1,500 rpm, then fuel cut will be cancelled.

NOTE:

This function is different from deceleration control listed under 

EC-979, "System Description"

.

Sensor

Input Signal to ECM

ECM function

Actuator

TCM

Neutral position

Fuel cut control Fuel injector

Accelerator pedal position sensor

Accelerator pedal position

Engine coolant temperature sensor

Engine coolant temperature

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

Engine speed

Wheel sensor

Vehicle speed*

EC-1378

< PERIODIC MAINTENANCE >

[VQ40DE FOR MEXICO]

FUEL PRESSURE

PERIODIC MAINTENANCE

FUEL PRESSURE

Fuel Pressure Check

INFOID:0000000009482051

FUEL PRESSURE RELEASE

 With CONSULT

1. Turn ignition switch ON.
2. Perform “FUEL PRESSURE RELEASE” in “WORK SUPPORT” mode with CONSULT.
3. Start engine.
4. After engine stalls, crank it two or three times to release all fuel pressure.
5. Turn ignition switch OFF.

 Without CONSULT

1. Remove fuel pump fuse (No.48) located in IPDM E/R.
2. Start engine.
3. After engine stalls, crank it two or three times to release all fuel

pressure.

4. Turn ignition switch OFF.
5. Reinstall fuel pump fuse after servicing fuel system.

FUEL PRESSURE CHECK

CAUTION:

Be careful not to scratch or get the fuel hose connection area dirty when servicing, so that the quick

connector o-ring maintains sealability.

NOTE:

• Prepare pans or saucers under the disconnected fuel line because the fuel may spill out. The fuel

pressure cannot be completely released because D40 models do not have fuel return system.

• Use Fuel Pressure Gauge Kit J-44321 and Fuel Pressure Adapter J-44321-6 to check fuel pressure.
1. Release fuel pressure to zero. Refer to "FUEL PRESSURE RELEASE".
2. Remove fuel hose using Quick Connector Release J-45488.

• Never twist or kink fuel hose because it is plastic hose.

• Never remove fuel hose from quick connector.

• Keep fuel hose connections clean.

3. Install Fuel Pressure Adapter J-44321-6 and Fuel Pressure

Gauge (from kit J-44321) as shown in figure.

• Never distort or bend fuel rail tube when installing fuel pres-

sure gauge adapter.

• When reconnecting fuel hose, check the original fuel hose for

damage and abnormality.

4. Turn ignition switch ON (reactivate fuel pump), and check for

fuel leakage.

5. Start engine and check for fuel leakage.
6. Read the indication of fuel pressure gauge.

• During fuel pressure check, check for fuel leakage from fuel

connection every 3 minutes.

7. If result is unsatisfactory, go to next step.

BBIA0534E

At idling: Approximately 350 kPa (3.57 kg/cm

2

, 51 psi)

BBIA0535E