System -- Engine Mechanical & Other

2019 Infiniti Q70 3.7 Luxe, AWDSECTION 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

Inspection

Fuel piping

5

5

5

5

5

5

Inspection

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

Inspection

Air cleaner

Inspection

Air leakage from air duct

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

5

5

5

5

Inspection

Electric throttle control actuator

Exploded View

Air leakage from intake manifold/Collector/Gasket

Inspection

Cranking

Battery

1

1

1

1

1

1

1

1

Exploded View

Generator circuit

Inspection Procedure , Inspection Procedure

Starter circuit

3

Work Flow (With GR8-1200 NI) , Work Flow (Without GR8-1200 NI)

Signal plate

6

Inspection

PNP signal circuit

4

DTC Logic

Engine

Cylinder head

5

5

5

5

5

5

5

5

Inspection

Cylinder head gasket

4

3

Cylinder block

6

6

6

6

6

6

6

6

4

Inspection

Piston

Piston ring

Connecting rod

Bearing

Crankshaft

Valve mechanism

Timing chain

5

5

5

5

5

5

5

5

Inspection

Camshaft

Inspection

Intake valve timing control

Inspection

Intake valve

3

Inspection

Exhaust valve

Exhaust

Exhaust manifold/Tube/Muffler/Gasket

5

5

5

5

5

5

5

5

Inspection , Inspection

Three way catalyst

Lubrication

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

5

5

5

5

5

5

5

5

Inspection , Inspection , Inspection

Oil level (Low)/Filthy oil

Inspection

Cooling

Radiator/Hose/Radiator filler cap

5

5

5

5

5

5

5

4

5

Inspection , Inspection

Thermostat

5

Inspection

Water pump

Inspection

Water gallery

Inspection

Cooling fan

5

Inspection

Coolant level (Low)/Contaminated coolant

Inspection

IVIS (INFINITI Vehicle Immobilizer System -- NATS)

1

1

Work Flow

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

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.