Nissan Sentra manuals

Nissan Sentra Service Manual: P0122, P0123 TP Sensor

Nissan Sentra Service Manual / Engine / Engine control system / Dtc/circuit diagnosis / P0122, P0123 TP Sensor

DTC Logic

DTC DETECTION LOGIC

NOTE:

If DTC P0122 or P0123 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.

Refer to EC-353, "DTC Logic".

DTC No.

 CONSULT screen terms (Trouble diagnosis content)

 DTC detecting condition

 Possible cause
P0122 TP SEN 2/CIRC-B1 (Throttle/Pedal position sensor/switch “A” circuit low) An excessively low voltage from the TP sensor 2 is sent to ECM.
  • Harness or connectors (TP sensor 2 circuit is open or shorted.)
  • Electric throttle control actuator (TP sensor 2)
P0123 TP SEN 2/CIRC-B1 (Throttle/Pedal position sensor/switch “A” circuit high) An excessively high voltage from the TP sensor 2 is sent to ECM.

DTC 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.

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.

>> GO TO 2.

2.PERFORM DTC CONFIRMATION PROCEDURE

  1. Start engine and let it idle for 1 second.
  2. Check 1st trip DTC.

1st trip DTC detected? YES >> Proceed to EC-200, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY

  1. Turn ignition switch OFF.
  2. Disconnect electric throttle control actuator harness connector.
  3. Turn ignition switch ON.
  4. Check the voltage between electric throttle control actuator harness connector and ground.

Is the inspection result normal?


Is the inspection result normal? YES >> GO TO 3.

NO >> GO TO 2.

2.CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT

  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Check the continuity between electric throttle control actuator harness connector and ECM harness connector.


  1. Also check harness for short to power.

Is the inspection result normal? YES >> Perform the trouble diagnosis for power supply circuit.

NO >> Repair or replace error-detected parts.

3.CHECK THROTTLE POSITION SENSOR 2 GROUND CIRCUIT

  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Check the continuity between electric throttle control actuator harness connector and ECM harness connector.

Is the inspection result normal?


Is the inspection result normal? YES >> GO TO 4.

NO >> Repair or replace error-detected parts.

4.CHECK THROTTLE POSITION SENSOR 2 INPUT SIGNAL CIRCUIT

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


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

Is the inspection result normal? YES >> GO TO 5.

NO >> Repair or replace error-detected parts.

5.CHECK THROTTLE POSITION SENSOR

Check throttle position sensor. Refer to EC-202, "Component Inspection (TP Sensor)".

Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".

NO >> Replace electric throttle control actuator. Refer to EM-27, "Removal and Installation".

Component Inspection (TP Sensor)

1.CHECK THROTTLE POSITION SENSOR

  1. Turn ignition switch OFF.
  2. Reconnect all harness connectors disconnected.
  3. Perform “ Throttle Valve Closed Position Learning”. Refer to EC-139, "Work Procedure".
  4. Turn ignition switch ON.
  5. Set selector lever to D (CVT) or 1st (M/T) position.
  6. Check the voltage between ECM harness connector terminals as per the following conditions.

Is the inspection result normal?


Is the inspection result normal? YES >> INSPECTION END

NO >> Replace electric throttle control actuator. Refer to EM-27, "Removal and Installation".

P0117, P0118 ECT Sensor
DTC Logic DTC DETECTION LOGIC DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition Possible cause P0117 ECT SEN/CIRC (Engine coolant tem ...

P0125 ECT Sensor
DTC Logic DTC DETECTION LOGIC NOTE: If DTC P0125 is displayed with P0116, first perform the trouble diagnosis for DTC P0116. Refer to EC- 196, "DTC Logic". If DTC P0125 is displ ...

Other materials:

P0441 EVAP Control system
DTC Logic DTC DETECTION LOGIC NOTE: If DTC P0441 is displayed with other DTC such as P2122, P2123, P2127, P2128 or P2138, first perform trouble diagnosis for other DTC. In this evaporative emission (EVAP) control system, purge flow occurs during non-closed throttle conditions. Purge volu ...

U0155 Lost communication (IPC)
DTC Logic DTC DETECTION LOGIC DTC CONSULT screen terms [Trouble diagnosis content] DTC detection condition Possible causes U0155 LOST COMM (IPC) [Lost Communication With Instrument Panel Cluster (IPC) Control Module] When the ignition switch is ON, TCM is ...

Text messaging
WARNING Laws in some jurisdictions may restrict the use of some of the applications and features, such as social networking and texting. Check local regulations for any requirements. Laws in some jurisdictions may restrict the use of “Text-to-Speech”. Check loc ...

© 2014-2025 Copyright www.nisentra.com