Infiniti QX4 (R50). Manual - part 163

SYMPTOM

Reference
page

HARD/NO

ST

AR

T/REST

AR

T

(EXCP

.

HA)

ENGINE

ST

ALL

HESIT

A

TION/SURGING/FLA

T

SPOT

SP

ARK

KNOCK/DET

ONA

TION

LACK

OF

POWER/POOR

ACCELERA

TION

HIGH

IDLE/LOW

IDLE

ROUGH

IDLE/HUNTING

IDLING

VIBRA

TION

SLOW/NO

RETURN

T

O

IDLE

OVERHEA

TS/W

A

TER

TEMPERA

TURE

HIGH

EXCESSIVE

FUEL

CONSUMPTION

EXCESSIVE

OIL

CONSUMPTION

BA

TTER

Y

DEAD

(UNDER

CHARGE)

Warranty symptom code

AA AB AC AD AE AF AG

AH

AJ

AK AL AM HA

Engine
control

Crankshaft position sensor (REF)
circuit

2

2

EC-510

Crankshaft position sensor (POS)
circuit

EC-334, 517

Camshaft position sensor
(PHASE) circuit

3

EC-342

Mass air flow sensor circuit

1

1

2

2

2

2

2

2

EC-150

Heated oxygen sensor 1 (front)
circuit

3

EC-192

Engine coolant temperature sen-
sor circuit

1

3

3

EC-169, 187

Throttle position sensor circuit

2

2

EC-174

Incorrect throttle position sensor
adjustment

3

1

1

1

1

1

1

1

EC-101

Vehicle speed sensor circuit

2

3

3

3

EC-417

Knock sensor circuit

2

EC-328

ECM

2

2

3

3

3

3

3

3

3

3

EC-444, 117

Start signal circuit

2

EC-621

Park/Neutral position switch circuit

3

3

3

3

3

EC-604

Power steering oil pressure switch
circuit

2

EC-634

Electrical load signal circuit

EC-644

1 - 6: The numbers refer to the order of inspection.
(continued on next page)

GI

MA

EM

LC

FE

AT

TF

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION

Symptom Matrix Chart (Cont’d)

EC-119

SYSTEM — ENGINE MECHANICAL & OTHER

NBEC0041S02

SYMPTOM

Reference
section

HARD/NO

ST

AR

T/REST

AR

T

(EXCP

.

HA)

ENGINE

ST

ALL

HESIT

A

TION/SURGING/FLA

T

SPOT

SP

ARK

KNOCK/DET

ONA

TION

LACK

OF

POWER/POOR

ACCELERA

TION

HIGH

IDLE/LOW

IDLE

ROUGH

IDLE/HUNTING

IDLING

VIBRA

TION

SLOW/NO

RETURN

T

O

IDLE

OVERHEA

TS/W

A

TER

TEMPERA

TURE

HIGH

EXCESSIVE

FUEL

CONSUMPTION

EXCESSIVE

OIL

CONSUMPTION

BA

TTER

Y

DEAD

(UNDER

CHARGE)

Warranty symptom code

AA AB AC AD AE AF AG

AH

AJ

AK AL AM HA

Fuel

Fuel tank

5

5

FE section

Fuel piping

5

5

5

5

5

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

Air cleaner

Air leakage from air duct
(Mass air flow sensor — throttle
body)

5

5

5

5

Throttle body, Throttle wire

FE section

Air leakage from intake manifold/
Collector/Gasket

—

Cranking

Battery

1

1

1

1

1

1

1

1

EL section

Alternator circuit

Starter circuit

3

Flywheel/Drive plate

6

EM section

PNP switch

4

AT section

1 - 6: The numbers refer to the order of inspection.
(continued on next page)

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION

Symptom Matrix Chart (Cont’d)

EC-120

SYMPTOM

Reference
section

HARD/NO

ST

AR

T/REST

AR

T

(EXCP

.

HA)

ENGINE

ST

ALL

HESIT

A

TION/SURGING/FLA

T

SPOT

SP

ARK

KNOCK/DET

ONA

TION

LACK

OF

POWER/POOR

ACCELERA

TION

HIGH

IDLE/LOW

IDLE

ROUGH

IDLE/HUNTING

IDLING

VIBRA

TION

SLOW/NO

RETURN

T

O

IDLE

OVERHEA

TS/W

A

TER

TEMPERA

TURE

HIGH

EXCESSIVE

FUEL

CONSUMPTION

EXCESSIVE

OIL

CONSUMPTION

BA

TTER

Y

DEAD

(UNDER

CHARGE)

Warranty symptom code

AA AB AC AD AE AF AG

AH

AJ

AK AL AM HA

Engine

Cylinder head

5

5

5

5

5

5

5

5

EM section

Cylinder head gasket

4

3

Cylinder block

6

6

6

6

6

6

6

6

4

Piston

Piston ring

Connecting rod

Bearing

Crankshaft

Valve
mechanism

Timing chain

5

5

5

5

5

5

5

5

Camshaft

Intake valve

3

Exhaust valve

Exhaust

Exhaust manifold/Tube/Muffler/
Gasket

5

5

5

5

5

5

5

5

FE section

Three way catalyst

Lubrication

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

5

5

5

5

5

5

5

5

MA, EM, LC
section

Oil level (Low)/Filthy oil

LC section

Cooling

Radiator/Hose/Radiator filler cap

5

5

5

5

5

5

5

4

5

Thermostat

5

Water pump

Water gallery

Coolant level (low)/Contaminated
coolant

MA section

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

GI

MA

EM

LC

FE

AT

TF

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION

Symptom Matrix Chart (Cont’d)

EC-121

SYMPTOM

Reference
section

HARD/NO

ST

AR

T/REST

AR

T

(EXCP

.

HA)

ENGINE

ST

ALL

HESIT

A

TION/SURGING/FLA

T

SPOT

SP

ARK

KNOCK/DET

ONA

TION

LACK

OF

POWER/POOR

ACCELERA

TION

HIGH

IDLE/LOW

IDLE

ROUGH

IDLE/HUNTING

IDLING

VIBRA

TION

SLOW/NO

RETURN

T

O

IDLE

OVERHEA

TS/W

A

TER

TEMPERA

TURE

HIGH

EXCESSIVE

FUEL

CONSUMPTION

EXCESSIVE

OIL

CONSUMPTION

BA

TTER

Y

DEAD

(UNDER

CHARGE)

Warranty symptom code

AA AB AC AD AE AF AG

AH

AJ

AK AL AM HA

IVIS (INFINITI Vehicle Immobilizer System —
NATS)

1

1

EC-74 or EL
section

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

CONSULT-II Reference Value in Data Monitor
Mode

NBEC0042

Remarks:

I

Specification data are reference values.

I

Specification data are output/input values which are detected or supplied by the ECM at the connector.

* Specification data may not be directly related to their components signals/values/operations.
i.e. Adjust ignition timing with a timing light before monitoring IGN TIMING, because the monitor may show the specification data in

spite of the ignition timing not being adjusted to the specification data. This IGN TIMING monitors the data calculated by the ECM
according to the signals input from the camshaft position sensor and other ignition timing related sensors.

I

If the real-time diagnosis results are NG and the on board diagnostic system results are OK when diagnosing the mass air flow sensor,

first check to see if the fuel pump control circuit is normal.

MONITOR ITEM

CONDITION

SPECIFICATION

ENG SPEED
CKPS·RPM (POS)

I

Tachometer: Connect

I

Run engine and compare tachometer indication with the CONSULT-II
value.

Almost the same speed as
the CONSULT-II value.

POS COUNT

I

Engine: Running

179 - 181

MAS A/F SE-B1

I

Engine: After warming up

I

Air conditioner switch: “OFF”

I

Shift lever: “N”

I

No-load

Idle

1.2 - 1.8V

2,500 rpm

1.6 - 2.2V

COOLAN TEMP/S

I

Engine: After warming up

More than 70°C (158°F)

HO2S1 (B1)
HO2S1 (B2)

I

Engine: After warming up

Maintaining engine speed at 2,000
rpm

0 - 0.3V

+,

Approx. 0.6 -

1.0V

HO2S1 MNTR (B1)
HO2S1 MNTR (B2)

LEAN

+,

RICH

Changes more than 5 times
during 10 seconds.

HO2S2 (B1)
HO2S2 (B2)

I

Engine: After warming up

Maintaining engine speed at 2,000
rpm

0 - 0.3V

+,

Approx. 0.6 -

1.0V

HO2S2 MNTR (B1)
HO2S2 MNTR (B2)

LEAN

+,

RICH

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION

Symptom Matrix Chart (Cont’d)

EC-122