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Nissan Armada 2025-2026 Service and Repair Manual: Basic Inspection

Nissan Armada 2025-2026 Service and Repair Manual / Engine / Engine Control System. Vr35ddtt / Basic Inspection

Work Procedure

INSPECTION START

  1. Check service records for any recent repairs that may indicate a related malfunction, or a current need for scheduled maintenance.

  2. Open engine hood and check the following:

    • Harness connectors for improper connections

    • Wiring harness for improper connections, pinches and cut

    • Vacuum hoses for splits, kinks and improper connections

    • Hoses and ducts for leaks

    • Air cleaner clogging

    • Gasket

  3. Confirm that electrical or mechanical loads are not applied.

    • Headlamp switch is OFF.

    • Air conditioner switch is OFF.

    • Rear window defogger switch is OFF.

    • Steering wheel is in the straight-ahead position, etc.

  4. Start engine and warm it up until engine coolant temperature indicator points the middle of gauge.

    Ensure engine stays below 1,000 rpm.

  5. Run engine at about 2,000 rpm for about 2 minutes under no load.

  6. Make sure that no DTC is displayed with CONSULT or GST.

Are any DTCs detected?

YES>>

GO TO 2.

NO>>

GO TO 3.

REPAIR OR REPLACE

Repair or replace components as necessary according to corresponding Diagnosis Procedure.

>>

GO TO 3

CHECK IDLE SPEED

  1. Run engine at about 2,000 rpm for about 2 minutes under no load.

  2. Rev engine (2,000 to 2,900 rpm) two or three times under no load, then run engine at idle speed for about 1 minute.

  3. Check idle speed.

    For procedure, refer to Inspection.

    For specification, refer to Idle Speed.

Is the inspection result normal?

YES>>

GO TO 10.

NO>>

GO TO 4.

PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING

  1. Stop engine.

  2. Perform Accelerator Pedal Released Position Learning. Refer to Work Procedure.

>>

GO TO 5.

PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Perform Throttle Valve Closed Position Learning. Refer to Work Procedure.

>>

GO TO 6.

PERFORM IDLE AIR VOLUME LEARNING

Perform Idle Air Volume Learning. Refer to Work Procedure.

Is Idle Air Volume Learning carried out successfully?

YES>>

GO TO 7.

NO>>

Follow the instruction of Idle Air Volume Learning. Then GO TO 4.

CHECK IDLE SPEED AGAIN

  1. Start engine and warm it up to normal operating temperature.

  2. Check idle speed.

    For procedure, refer to Inspection.

    For specification, refer to Idle Speed.

Is the inspection result normal?

YES>>

GO TO 10.

NO>>

GO TO 8.

DETECT MALFUNCTIONING PART

Check the Following.

  • Check camshaft position sensor (PHASE) and circuit. Refer to Component Inspection.

  • Check crankshaft position sensor (POS) and circuit. Refer to Component Inspection.

Is the inspection result normal?

YES>>

GO TO 9.

NO>>

Repair or replace. Then GO TO 4.

CHECK ECM FUNCTION

  1. Substitute with a non-malfunctioning ECM to check ECM function. (ECM may be the cause of the incident, although this is rare.)

  2. Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs. Refer to Work Procedure.

>>

GO TO 4.

CHECK IGNITION TIMING

  1. Run engine at idle.

  2. Check ignition timing.

For procedure, refer to IGNITION TIMING : Periodic Maintenance.

For specification, refer to Ignition Timing.

Is the inspection result normal?

YES>>

GO TO 19.

NO>>

GO TO 11.

PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING

  1. Stop engine.

  2. Perform Accelerator Pedal Released Position Learning. Refer to Work Procedure.

>>

GO TO 12.

PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Perform Throttle Valve Closed Position Learning. Refer to Work Procedure.

>>

GO TO 13.

PERFORM IDLE AIR VOLUME LEARNING

Perform Idle Air Volume Learning. Refer to Work Procedure.

Is Idle Air Volume Learning carried out successfully?

YES>>

GO TO 14.

NO>>

Follow the instruction of Idle Air Volume Learning. Then GO TO 4.

CHECK IDLE SPEED AGAIN

  1. Start engine and warm it up to normal operating temperature.

  2. Check idle speed.

    For procedure, refer to Inspection.

    For specification, refer to Idle Speed.

Is the inspection result normal?

YES>>

GO TO 15.

NO>>

GO TO 17.

CHECK IGNITION TIMING AGAIN

  1. Run engine at idle.

  2. Check ignition timing.

For procedure, refer toIGNITION TIMING : Periodic Maintenance.

For specification, refer to Ignition Timing.

Is the inspection result normal?

YES>>

GO TO 19.

NO>>

GO TO 16.

CHECK TIMING CHAIN INSTALLATION

Check timing chain installation. Refer to Exploded View.

Is the inspection result normal?

YES>>

GO TO 17.

NO>>

Repair the timing chain installation. Then GO TO 4.

DETECT MALFUNCTIONING PART

Check the following.

  • Check camshaft position sensor (PHASE) and circuit. Refer to Component Inspection.

  • Check crankshaft position sensor (POS) and circuit. Refer to Component Inspection.

Is the inspection result normal?

YES>>

GO TO 18.

NO>>

Repair or replace. Then GO TO 4.

CHECK ECM FUNCTION

  1. Substitute with a non-malfunctioning ECM to check ECM function. (ECM may be the cause of the incident, although this is rare.)

  2. Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs. Refer to Work Procedure.

>>

GO TO 4.

INSPECTION END

If ECM is replaced during this BASIC INSPECTION procedure, Refer to Work Procedure.

>>

INSPECTION END

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