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System -- Engine Mechanical & Other

SYMPTOM

Reference

HARD/NO START/RESTART (EXCP. HA)

ENGINE STALL

HESITATION/SURGING/FLAT SPOT

SPARK KNOCK/DETONATION

LACK OF POWER/POOR ACCELERATION

HIGH IDLE/LOW IDLE

ROUGH IDLE/HUNTING

IDLING VIBRATION

SLOW/NO RETURN TO IDLE

OVERHEATS/WATER TEMPERATURE HIGH

EXCESSIVE FUEL CONSUMPTION

EXCESSIVE OIL CONSUMPTION

BATTERY DEAD (UNDER CHARGE)

Warranty symptom code

AA

AB

AC

AD

AE

AF

AG

AH

AJ

AK

AL

AM

HA

Fuel

Fuel tank

5

5

Removal and Installation - VQ40DE

Fuel piping

5

5

5

5

5

5

Checking Fuel Line

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

Removal and Installation

Air cleaner

Removal and Installation

Air leakage from air duct

(Mass air flow sensor -- electric throttle control actuator)

5

5

5

5

Removal and Installation

Electric throttle control actuator

Removal and Installation

Air leakage from intake manifold/Collector/Gasket

Removal and Installation ,

Removal and Installation

Cranking

Battery

1

1

1

1

1

1

1

1

Work Flow

Generator circuit

Work Flow (With EXP-800 NI or GR8-1200 NI)

Work Flow (Without EXP-800 NI or GR8-1200 NI)

Starter circuit

3

Work Flow (With GR8-1200 NI)

Work Flow (Without GR8-1200 NI)

Signal plate

6

Inspection After Disassembly

PNP signal circuit

4

DTC Logic

Engine

Cylinder head

5

5

5

5

5

5

5

5

Inspection After Disassembly

Cylinder head gasket

4

3

Cylinder block

6

6

6

6

6

6

6

6

4

Inspection After Disassembly

Piston

Piston ring

Connecting rod

Bearing

Crankshaft

Valve mechanism

Timing chain

5

5

5

5

5

5

5

5

Removal and Installation

Camshaft

Removal and Installation

Intake valve timing control

Removal and Installation

Intake valve

3

Inspection After Disassembly

Exhaust valve

Exhaust

Exhaust manifold/Tube/Muffler/Gasket

5

5

5

5

5

5

5

5

Removal and Installation (Exhaust Manifold) , Removal and Installation (Three Way Catalyst) , Removal and Installation

Three way catalyst

Lubrication

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

5

5

5

5

5

5

5

5

Removal and Installation , Removal and Installation , Removal and Installation ,

Lubrication Circuit

Oil level (Low)/Filthy oil

Inspection

Cooling

Radiator/Hose/Radiator filler cap

5

5

5

5

5

5

5

4

5

Checking Radiator , Exploded View

Thermostat

5

Removal and Installation

Water pump

Removal and Installation

Water gallery

Cooling Circuit

Cooling fan

5

Removal and Installation (Crankshaft driven type) , Removal and Installation (Motor driven type)

Coolant level (Low)/Contaminated coolant

System Inspection

IVIS (INFINITI Vehicle Immobilizer System -- NATS)

1

1

System Description

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