Nissan Sentra B18 (2020-2025) Service Manual: Work Procedure (After Replacing Electric Throttle Control Actuator)

1. PRECONDITIONING

   Check that all of the following conditions are satisfied.

   Learning will be cancelled if any of the following conditions are missed for even a moment.

   • Battery voltage: More than 12.9 V (At idle)

   • Engine coolant temperature: 70 – 100°C (158 – 212°F)

   • Selector lever: P or N

   • Electric load switch: OFF

     (Air conditioner, headlamp, rear window defogger)

   • Steering wheel: Neutral (Straight-ahead position) position

   • Nissan Sentra Vehicle speed: Stopped

   • Transmission: Warmed-up (Drive vehicle for 10 minutes.)

   • With CONSULT: Drive Nissan Sentra vehicle until “ATF TEMP SEN” in “DATA MONITOR” mode of “TRANSMISSION” system indicates less than 0.9 V.

   • Without CONSULT: Drive Nissan Sentra vehicle for 10 minutes.

   >>

   GO TO 2.

2. IDLE AIR VOLUME LEARNING

   With CONSULT

   1. Perform “ACCELERATOR PEDAL RELEASED POSITION LEARNING”. Refer to Work Procedure.

   2. Perform “THROTTLE VALVE CLOSED POSITION LEARNING”. Refer to Work Procedure.

   3. Start engine and warm it up to normal operating temperature.

   4. Select “IDLE AIR VOL LEARN” in “WORK SUPPORT” mode of “ENGINE” using CONSULT.

   5. Touch “START” and wait 20 seconds.

   Is “CMPLT” displayed on CONSULT screen?

   YES >>

   GO TO 3.

   NO >>

   GO TO 4.

3. CHECK IDLE SPEED AND IGNITION TIMING

   Rev up the engine two or three times and make sure that idle speed and ignition timing are within the specifications. For specification, refer to IDLE SPEED : Service Data and IGNITION TIMING : Service Data.

   Is the inspection result normal?

   YES >>

   INSPECTION END

   NO >>

   GO TO 4.

4. DETECT MALFUNCTIONING PART-1

   Check the following

   • Check that throttle valve is fully closed.

   • Check PCV valve operation.

   • Check that downstream of throttle valve is free from air leakage.

   Is the inspection result normal?

   YES >>

   GO TO 5.

   NO >>

   Repair or replace malfunctioning part.

5. DETECT MALFUNCTIONING PART-2

   Engine component parts and their installation condition are questionable. Check and eliminate the cause of the incident.

   It is useful to perform “TROUBLE DIAGNOSIS – SPECIFICATION VALUE”. Refer to Diagnosis Description.

   If any of the following conditions occur after the engine has started, eliminate the cause of the incident and perform “IDLE AIR VOLUME LEARNING” all over again:

   • Engine stalls

   • Erroneous idle

   >>

   INSPECTION END

Mixture Ratio Self-Learning Value Clear

Work Procedure

Description

This describes how to erase the mixture ratio self-learning value. For the actual procedure, follow the instructions in “Diagnosis Procedure”.

Work Procedure

1. START

   With CONSULT

   1. Start engine and warm it up to normal operating temperature.

   2. Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT.

   3. Clear mixture ratio self-learning value by touching “CLEAR”.

   Without CONSULT

   1. Start engine and warm it up to normal operating temperature.

   2. Turn ignition switch OFF.

   3. Disconnect mass air flow sensor harness connector.

   4. Restart engine and let it idle for at least 5 seconds.

   5. Stop engine and reconnect mass air flow sensor harness connector.

   6. Check DTC. Make sure DTC P0102 is detected.

   7. Erase the DTC P0102.

   8. Check DTC. Make sure DTC P0000 is detected.

   >>

   END

Starter Operation Counter Clear

Work Procedure

Starter Operation Counter Clear is a function of ECM to erase the starter motor operation counter. it must be performed when starter motor is replaced.

CAUTION:

Performed this function when starter motor is replaced.

1. ERASE STARTER OPERATION COUNTER

   With CONSULT

   1. Turn ignition switch ON.

   2. Select “STRT OPRTN CNTR CLEAR” in “WORK SUPPORT” mode of “ENGINE” using CONSULT.

   3. Touch “CLEAR” and erase starter operation counter.

   Without CONSULT

   Note:

   • It is better to count the time accurately with a clock.

   • It is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit has a malfunction.

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

   2. Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.

   3. Repeat the following procedure quickly five times within 5 seconds.

      • Fully depress the accelerator pedal.

      • Fully release the accelerator pedal.

   4. Wait 7 seconds, repeat the following procedure quickly five times within 5 seconds.

      • Fully depress the accelerator pedal.

      • Fully release the accelerator pedal.

   5. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds.

   6. Fully release the accelerator pedal and turn the ignition switch OFF.

      
   >>

   INSPECTION END

Throttle Valve Closed Position Learning

Work Procedure

Description

Throttle Valve Closed Position Learning is a function of ECM to learn the fully closed position of the throttle valve by monitoring the throttle position sensor output signal. It must be performed each time the harness connector of the electric throttle control actuator or ECM is disconnected or electric throttle control actuator inside is cleaned.

Work Procedure

1. START

   With CONSULT

   1. Turn ignition switch ON.

   2. Select “CLSD THL POS LEARN” in “WORK SUPPORT” mode of “ENGINE” using CONSULT.

   3. Follow the instructions on the CONSULT display.

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

      Check that throttle valve moves during the above 10 seconds by confirming the operating sound.

   Without CONSULT

   1. Start the engine.

      Note:

      Engine coolant temperature is 25 °C (77 °F) or less before engine starts.

   2. Warm up the engine until engine coolant temperature reaches more than 65 °C (149 °F).

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

      Check that throttle valve moves during the above 10 seconds by confirming the operating sound.

   >>

   END

Vin Registration

Work Procedure

Description

VIN Registration is an operation to registering VIN in ECM. It must be performed each time ECM is replaced.

Work Procedure

1. CHECK VIN

   Check the VIN of the Nissan Sentra vehicle and note it. Refer to Identification Number.

   >>

   GO TO 2.

2. PERFORM VIN REGISTRATION

   With CONSULT

   1. Turn ignition switch ON and engine stopped.

   2. Select “VIN REGISTRATION” in “WORK SUPPORT” mode of “ENGINE”.

   3. Follow the instruction of CONSULT display.

   >>

   END

Electric Ivt Control Actuator Position Learning

Work Procedure

DESCRIPTION

Electric intake valve timing control (IVT) module requires the learning of camshaft reference position.

This learning must be performed where the following operations are performed:

• Replacement of electric IVT control module

• Replacement of intake/exhaust camshaft position sensor

• Replacement of crankshaft position sensor

• Removal and installation of timing chain

• Replacement of the mechanical parts listed below:

  • Replacement of timing chain

  • Replacement of intake/exhaust camshaft

  • Replacement of intake/exhaust camshaft sprocket

  • Replacement of piston

  • Replacement of connecting rod

  • Replacement of crankshaft

If learning is not performed after the replacement of the above listed parts, the engine may not be able to be started.

1. START

   Do you have CONSULT?

   YES >>

   GO TO 2.

   NO >>

   GO TO 3.

2. ELECTRIC INTAKE VALVE TIMING (IVT) CONTROL ACTUATOR REFERENCE POSITION LEARNING

   With CONSULT

   1. Turn ignition switch ON.

   2. On CONSULT screen, select All DTC Reading and check that any DTC is not detected.

   3. Select “Electric intake valve timing control learning” in “WORK SUPPORT” of “ENGINE”.

   4. Touch “Start” and start the engine within 10 seconds.

   5. Let the engine be idle.

   6. Check that “COMPLETED” is displayed.

   Is the learning completed normally?

   YES >>

   END

   NO >>

   Check that DTC is not detected and restart the learning.

3. PERFORM ELECTRIC IVT CONTROL ACTUATOR REFERENCE POSITION LEARNING

   Without CONSULT

   1. Turn ignition switch OFF.

   2. Disconnect electric IVT control actuator harness connector (actuator side).

   3. Turn ignition switch ON and wait at least 30 seconds.

   4. Turn ignition switch OFF.

   5. Reconnect the disconnected harness connector.

   6. Start engine and let it idle at least 15 seconds.

   7. Turn ignition switch OFF.

   8. Check and erase DTC.

   >>

   END

• Dtc/circuit Diagnosis
• Component Parts /circuit Diagnosis
• Symptom Diagnosis
• Periodic Maintenance
• Removal and Installation
• Service Data and Specifications (sds)

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