2015 Infiniti QX80 Base, AWDFACTORY OEM SERVICE PROCEDURE

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
  • 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
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.

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.

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