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Nissan Sentra B18 (2020-2025) Service Manual: P2118 Throttle Control Motor

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

P2118

ETC MOT-B1

(Throttle actuator control motor current range/performance)

Diagnosis condition

Engine running at idle

Signal (terminal)

Throttle control motor signal

Threshold

ECM detects short in throttle control motor signal circuit

Diagnosis delay time

—

POSSIBLE CAUSE

  • Harness or connectors (Throttle control motor circuit is shorted.)

  • Electric throttle control actuator (Throttle control motor)

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).

Others

ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.

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 perform the following procedure before conducting the next test.

    1. Turn ignition switch OFF and wait at least 10 seconds.

    2. Turn ignition switch ON.

    3. Turn ignition switch OFF and wait at least 10 seconds.

    >>

    GO TO 2.

  2. PERFORM DTC CONFIRMATION PROCEDURE

    1. Turn ignition switch ON and wait at least 2 seconds.

    2. Start engine and let it idle for 5 seconds.

    3. Check DTC.

    Is 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 THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect electric throttle control actuator harness connector.

    3. Disconnect ECM harness connector.

    4. Check the continuity between electric throttle control actuator harness connector and ECM harness connector.

      Electric throttle control actuator

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F7

      5

      F25

      129

      Existed

      130

      Not existed

      6

      129

      Not existed

      130

      Existed

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

    Is the inspection result normal?

    YES >>

    GO TO 2.

    NO >>

    Repair or replace malfunctioning part.

  2. CHECK THROTTLE CONTROL MOTOR

    Check the throttle control motor. Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Replace electric throttle control actuator. Refer to Removal and Installation.

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