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Nissan Sentra B18 (2020-2025) Service Manual: P2101 Electric Throttle Control Function

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

P2101

ETC FNCTN/CIRC-B1

(Throttle actuator “A” control motor circuit range/performance)

Diagnosis condition

Engine running at idle

Signal (terminal)

—

Threshold

Electric throttle control function does not operate properly

Diagnosis delay time

—

POSSIBLE CAUSE

  • Harness or connectors

    • Throttle control motor circuit is open or shorted.

    • Throttle control motor relay circuit is open or shorted.

  • Electric throttle 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).

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. CHECK DTC PRIORITY

    If DTC P2101 is displayed with DTC P2100 or P2119, first perform the trouble diagnosis for DTC P2100 or P2119.

    Is applicable DTC detected?

    YES >>

    Perform diagnosis of applicable.

    • DTC P2100: Refer to DTC Description.

    • DTC P2119: Refer to DTC Description.

    NO >>

    GO TO 2.

  2. 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.

    TESTING CONDITION:

    Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.

    >>

    GO TO 3.

  3. 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 >>

    Proceed 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 DTC PRIORITY

    If DTC P2101 is displayed with DTC P2100 or P2119, first perform the trouble diagnosis for DTC P2100 or P2119.

    Is applicable DTC detected?

    YES >>

    Perform diagnosis of applicable.

    • DTC P2100: Refer to DTC Description.

    • DTC P2119: Refer to DTC Description.

    NO >>

    GO TO 2.

  2. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL

    Check the voltage between ECM harness connector terminals as per the following conditions.

    +

    −

    Condition

    Voltage

    (Approx.)

    ECM

    Connector

    Terminal

    Connector

    Terminal

    F25

    97

    E16

    162

    Ignition switch

    OFF

    0 V

    ON

    Battery voltage

    Is the inspection result normal?

    YES >>

    GO TO 5.

    NO >>

    GO TO 3.

  3. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

    3. Disconnect IPDM E/R harness connector.

    4. Check the continuity between ECM harness connector and IPDM E/R harness connector.

      ECM

      IPDM E/R

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F25

      97

      F96

      67

      Existed

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

    Is the inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    Repair or replace malfunctioning part.

  4. CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT

    1. Check the continuity between ECM harness connector and IPDM E/R harness connector.

      ECM

      IPDM E/R

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F25

      128

      F96

      72

      Existed

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

    Is the inspection result normal?

    YES >>

    Perform the trouble diagnosis for power supply circuit.

    NO >>

    Repair or replace malfunctioning part.

  5. 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 6.

    NO >>

    Repair or replace malfunctioning part.

  6. CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY

    1. Remove the intake air duct. Refer to Removal and Installation.

    2. Check if foreign matter is caught between the throttle valve and the housing.

    Is the inspection result normal?

    YES >>

    GO TO 7.

    NO >>

    Remove the foreign matter and clean the electric throttle control actuator inside, then perform throttle valve closed position learning. Refer to Work Procedure.

  7. 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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