2018 Infiniti QX80 AWDFACTORY OEM SERVICE PROCEDURE

Active Test Mode

WARNING: This page is about a different car, the 2019 Nissan Armada and 2018 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.

Test Item 

TEST ITEM

CONDITION

JUDGMENT

CHECK ITEM (REMEDY)

VENT CONTROL/V
  • Ignition switch: ON (Engine stopped)
  • Turn solenoid valve ON and OFF with the CONSULT and listen to operating sound.

Solenoid valve makes an operating sound.
  • Harness and connectors
  • Solenoid valve

ENG COOLANT TEMP
  • Engine: Return to the original non-standard condition
  • Change the engine coolant temperature using CONSULT.

If malfunctioning symptom disappears, see CHECK ITEM.
  • Harness and connectors
  • Engine coolant temperature sensor 1
  • Fuel injector

FUEL INJECTION
  • Engine: Return to the original non-standard condition
  • Change the amount of fuel injection using CONSULT.

If malfunctioning symptom disappears, see CHECK ITEM.
  • Harness and connectors
  • Fuel injector
  • Air fuel ratio (A/F) sensor 1

FUEL/T TEMP SEN
  • Change the fuel tank temperature using CONSULT.

PURG VOL CONT/V
  • Engine: After warming up, run engine at 1, 500 rpm.
  • Change the EVAP canister purge volume control solenoid valve opening percent using CONSULT.

Engine speed changes according to the opening percent.
  • Harness and connectors
  • Solenoid valve

FAN DUTY CONTROL*
  • Ignition switch: ON
  • Change duty ratio using CONSULT.

Cooling fan speed changes.
  • Harness and connectors
  • Cooling fan motor
  • Cooling fan relay
  • Cooling fan control module
  • IPDM E/R

ALTERNATOR DUTY
  • Engine: Idle
  • Change duty ratio using CONSULT.

Battery voltage changes.
  • Harness and connectors
  • IPDM E/R
  • Alternator

EXH V/T ASSIGN ANGLE
  • Engine: Return to the original non-standard condition
  • Change exhaust valve timing using CONSULT.

If malfunctioning symptom disappears, see CHECK ITEM.
  • Harness and connectors
  • Exhaust valve timing control magnet retarder

POWER BALANCE
  • Engine: After warming up, idle the engine.
  • A/C switch OFF
  • Selector lever: P or N
  • Cut off each injector signal one at a time using CONSULT.

Engine runs rough or stops.
  • Harness and connectors
  • Compression
  • Fuel injector
  • Power transistor
  • Spark plug
  • Ignition coil

IGNITION TIMING
  • Engine: Return to the original non-standard condition
  • Timing light: Set
  • Retard the ignition timing using CONSULT.

If malfunctioning symptom disappears, see CHECK ITEM.
  • Perform Idle Air Volume Learning.

V/T ASSIGN ANGLE
  • Engine: Return to the original non-standard condition
  • Change intake valve timing using CONSULT.

If malfunctioning symptom disappears, see CHECK ITEM.
  • Harness and connectors
  • Intake valve timing control solenoid valve

FPCM
  • Engine: Return to the original trouble condition
  • Select "LOW", "MID" and "HI" with CONSULT.

Fuel pump speed changes or stops.
  • Harness and connectors
  • Fuel pump control module (FPCM)

*: Leaving cooling fan OFF with CONSULT while engine is running may cause the engine to overheat.

Chapter Navigation
Return to Chapter: CONSULT Function
Factory Service Tools

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When to See a Mechanic

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

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