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Nissan Sentra B18 (2020-2025) Service Manual: P2122 App Sensor

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

P2122

APP SEN 1/CIRC

(Throttle/Pedal position sensor/switch “D” circuit low)

Diagnosis condition

Engine running at idle

Signal (terminal)

Accelerator pedal position sensor 1 signal

Threshold

An excessively low voltage is sent to ECM

Diagnosis delay time

—

POSSIBLE CAUSE

  • Harness or connectors (APP sensor 1 circuit is open or shorted.)

  • Accelerator pedal position sensor (APP sensor 1)

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

The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 degrees.

The ECM regulates the opening speed of the throttle valve to be slower than the normal condition. Therefore, the acceleration will be poor.

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 P2122 or P2123 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.

    Is applicable DTC detected?

    YES >>

    Perform diagnosis of applicable. 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 8 V at idle.

    >>

    GO TO 3.

  3. PERFORM DTC CONFIRMATION PROCEDURE

    1. Start the engine and let it idle for 1 second.

    2. 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 P2122 or P2123 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.

    Is applicable DTC detected?

    YES >>

    Perform diagnosis of applicable. Refer to DTC Description.

    NO >>

    GO TO 2.

  2. CHECK APP SENSOR 1 POWER SUPPLY-1

    1. Turn ignition switch OFF.

    2. Disconnect accelerator pedal position (APP) sensor harness connector.

    3. Turn ignition switch ON.

    4. Check the voltage between APP sensor harness connector and ground.

      APP sensor

      Voltage

      (Approx.)

      Connector

      +

      −

      Terminal

      E12

      4

      2

      5 V

    Is the inspection result normal?

    YES >>

    GO TO 7.

    NO >>

    GO TO 3.

  3. CHECK APP SENSOR 1 POWER SUPPLY-2

    Check the voltage between APP sensor harness connector and ground.

    +

    −

    Voltage

    (Approx.)

    APP sensor

    Connector

    Terminal

    E12

    4

    Ground

    5 V

    Is the inspection result normal?

    YES >>

    GO TO 5.

    NO >>

    GO TO 4.

  4. CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

    3. Check the continuity between APP sensor harness connector and ECM harness connector.

      APP sensor

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E12

      4

      E16

      156

      Existed

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

    Is the inspection result normal?

    YES >>

    Perform the trouble diagnosis for ECM power supply circuit. Refer to Diagnosis Procedure.

    NO >>

    Repair or replace malfunctioning part.

  5. CHECK APP SENSOR 1 GROUND CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

    3. Check the continuity between APP sensor harness connector and ECM harness connector.

      APP sensor

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E12

      2

      E16

      161

      Existed

    4. 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 ECM GROUND CIRCUIT

    1. Check the continuity between ECM harness connector and ground.

      ECM

      —

      Continuity

      Connector

      Terminal

      F24

      5

      Ground

      Existed

      65

      F25

      69

      E16

      157

      159

      162

    2. Also check harness for short to power.

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Repair or replace malfunctioning part.

  7. CHECK APP SENSOR 1 INPUT SIGNAL CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

    3. Check the continuity between APP sensor harness connector and ECM harness connector.

      APP sensor

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E12

      3

      E16

      160

      Existed

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

    Is the inspection result normal?

    YES >>

    GO TO 8.

    NO >>

    Repair or replace malfunctioning part.

  8. CHECK APP SENSOR

    Check the APP sensor. Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Replace accelerator pedal assembly. Refer to Removal and Installation.

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