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Nissan Sentra B18 (2020-2025) Service Manual: P34ac Electric Intake Valve Timing Control Actuator

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

P34AC

A camshaft posi actuator posi sens B1

(A camshaft position actuator position sensor bank 1)

Diagnosis condition

—

Signal (terminal)

Electric intake valve timing control position sensor signal

Threshold

An excessively low/high voltage from the sensor is sent to the electric IVT control module.

Diagnosis delay time

1 second or more

POSSIBLE CAUSE

  • Harness or connectors [Electric intake valve timing (IVT) control actuator circuit is open or shorted.]

  • Electric IVT control actuator

FAIL-SAFE

Engine Control System

Engine operating condition in fail-safe mode

Fail safe mode

Nissan Sentra Vehicle behavior

Device fix mode

  • This mode fixes the electric IVT motor and the EVT control solenoid valve in the reference position.

  • The intake manifold runner control valve motor is turned OFF (intake manifold runner control valve opens).

Combustion control mode

Stratified charge combustion control at starting

No stratified charge combustion at starting (cold start).

Idle Start/Stop System

When a DTC is detected, the start/stop indicator lamp blinks slowly and the idle start/stop system operation is prohibited.

When ECM detects error while operating the idle start/stop system, ECM restarts the engine.

Confirmation Procedure

Confirmation Procedure

  1. PRECONDITIONING

    If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

    >>

    GO TO 2.

  2. PERFORM DTC CONFIRMATION PROCEDURE

    1. Maintaining engine speed at more than 2000 rpm for at least 1 seconds.

    2. Check 1st trip DTC.

    Is 1st trip DTC detected?

    YES >>

    Refer to DTC Diagnosis Procedure.

    NO-1 >>

    To check malfunction symptom before repair: Refer to Intermittent Incident.

    NO-2 >>

    Confirmation after repair: INSPECTION END

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

  1. CHECK ELECTRIC INTAKE VALVE TIMING CONTROL POSITION SENSOR CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect electric intake valve timing control position sensor harness connector.

    3. Disconnect intake valve timing control module harness connector.

    4. Check the continuity between the electric intake valve timing control position sensor harness connector and the electric intake valve timing control module harness connector.

      Electric intake valve timing control position sensor

      Electric intake valve timing control module

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F87

      3

      F80

      9

      Existed

      4

      35

      5

      6

    5. Also check harness for short to power and short to ground.

    Is the inspection result normal?

    YES >>

    GO TO 2.

    NO >>

    Repair or replace error-detected parts.

  2. CHECK INTERMITTENT INCIDENT

    Check intermittent incident. Refer to Intermittent Incident.

    Is the inspection result normal?

    YES >>

    Replace the electric intake valve timing control actuator. Refer to Exploded View.

    NO >>

    Repair or replace error-detected parts.

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