Nissan Sentra manuals

Nissan Sentra Service Manual: P0846 Transmission fluid pressure SEN/SW B

DTC Logic

DTC DETECTION LOGIC

DTC

CONSULT screen terms (Trouble diagnosis content)

DTC detection condition

Possible causes

P0846 TRANSMISSION FLUID PRESSURE SEN/SW B (Transmission Fluid Pressure Sensor/Switch B Circuit Range/Performance) The detection conditions continuously for 5 seconds or more under the following diagnosis conditions:

Diagnosis conditions

  • Selector lever: “D” position
  • The primary pulley speed experienced 306 rpm or more and the secondary pulley speed experienced 230 rpm or more at least once.
  • Stop lamp switch: OFF
  • Wheel spin is not being detected.
  • The rate of change in pulley ratio: Between −0.09 and +0.09 inclusive
  • Solenoid valve output current: 750 mA or more
  • GND short diagnosis of the solenoid valve circuit is not satisfied.
  • TCM power supply voltage: More than 11 V

Detection conditions

  • After the value of “Actual secondary pressure − Target secondary pressure” exceeds 0.675 MPa:

The rate of change in vehicle speed [km/h (MPH)]: Between −49 (−30) and +49 (+30) inclusive

The rate of change in accelerator pedal angle: Between −1.3/8 and +1.3/8 inclusive

  • Secondary pressure sensor
  • Control valve assembly

DTC CONFIRMATION PROCEDURE

CAUTION:

Be careful of the driving speed.

1.PREPARATION BEFORE WORK

If another “DTC CONFIRMATION PROCEDURE” occurs just before, turn ignition switch OFF and wait for at least 10 seconds, then perform the next test.

>> GO TO 2.

2.CHECK DTC DETECTION

  1. Start the engine.
  2. Shift the selector lever to “D” position.
  3. Drive the vehicle at a constant velocity of 40 km/h (25 MPH) at lease for 10 seconds.

CAUTION:

At the same time, the accelerator pedal angle must be maintained constant.

  1. Stop the vehicle.
  2. Check the first trip DTC.

Is “P0846”detected? YES >> Go to TM-192, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK TCM INPUT SIGNAL

  1. Start the engine.
  2. Check voltage between TCM connector terminal and ground.

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

NO >> There is a malfunction of secondary pressure sensor value. Replace transaxle assembly. Refer to TM-283, "Removal and Installation".

P0847 TRANSMISSION FLUID PRESSURE SEN/SW B

DTC Logic

DTC DETECTION LOGIC

DTC

CONSULT screen terms (Trouble diagnosis content)

DTC detection condition

Possible causes

P0847 TRANSMISSION FLUID PRESSURE SEN/SW B (Transmission Fluid Pressure Sensor/Switch B Circuit Low) The secondary pressure sensor voltage is 0.09 V or less continuously for 5 seconds or more under the following diagnosis conditions:

Diagnosis conditions

  • CVT fluid temperature: More than −20В°C (− 4В°F)
  • TCM power supply voltage: More than 11 V
  • Harness or connector (Secondary pressure sensor circuit is open or shorted to ground)
  • Secondary pressure sensor
  • Control valve assembly

DTC CONFIRMATION PROCEDURE

1.PREPARATION BEFORE WORK

If another “DTC CONFIRMATION PROCEDURE” occurs just before, turn ignition switch OFF and wait for at least 10 seconds, then perform the next test.

>> GO TO 2.

2.CHECK DTC DETECTION

With CONSULT


  1. Start the engine.
  2. Select “Data Monitor” in “TRANSMISSION”.
  3. Select “FLUID TEMP”.
  4. Maintain the following conditions for 10 seconds or more.

FLUID TEMP : −19В°C (−2.2В°F) or more

  1. Check the first trip DTC.

With GST


  1. Start the engine and wait for at least 10 seconds.

CAUTION:

When the ambient temperature is −20В°C (−4В°F) or less and the engine is cold, warm up the engine for approximately 5 minutes.

  1. Check the first trip DTC.

Is “P0847”detected? YES >> Go to TM-194, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK CIRCUIT BETWEEN TCM AND CVT UNIT (PART 1)

  1. Turn ignition switch OFF.
  2. Disconnect TCM connector and CVT unit connector.
  3. Check continuity between TCM harness connector terminals and CVT unit harness connector terminals.

result normal? Is the inspection
result normal?

YES >> GO TO 2.

NO >> Repair or replace malfunctioning parts.

2.CHECK CIRCUIT BETWEEN TCM AND CVT UNIT (PART 2)

Check continuity between TCM harness connector terminals and ground.

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

NO >> Repair or replace malfunctioning parts.

3.CHECK TCM INPUT SIGNALS

  1. Connect all connectors removed.
  2. Start the engine.
  3. Check voltage between TCM connector terminal and ground.

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

NO >> There is malfunction of secondary pressure sensor. Replace transaxle assembly. Refer to TM- 283, "Removal and Installation".

P0848 TRANSMISSION FLUID PRESSURE SEN/SW B

DTC Logic

DTC DETECTION LOGIC

DTC

CONSULT screen terms (Trouble diagnosis content)

DTC detection condition

Possible causes

P0848 TRANSMISSION FLUID PRESSURE SEN/SW B (Transmission Fluid Pressure Sensor/Switch B Circuit Low) The secondary pressure sensor voltage is 4.7 V or more continuously for 5 seconds or more under the following diagnosis conditions:

Diagnosis conditions

  • CVT fluid temperature: More than −20В°C (− 4В°F)
  • Secondary pressure target value: 5.7 MPa or less
  • TCM power supply voltage: More than 11 V
  • Harness or connector (Secondary pressure sensor circuit is shorted to power supply)
  • Secondary pressure sensor
  • Control valve assembly

DTC CONFIRMATION PROCEDURE

1.PREPARATION BEFORE WORK

If another “DTC CONFIRMATION PROCEDURE” occurs just before, the ignition switch OFF and wait for at least 10 seconds, then perform the next test.

>> GO TO 2.

2.CHECK DTC DETECTION

With CONSULT


  1. Start the engine.
  2. Select “Data Monitor” in “TRANSMISSION”.
  3. Select “FLUID TEMP”.
  4. Maintain the following conditions for 10 seconds or more.

FLUID TEMP : −19В°C (−2.2В°F) or more

  1. Check the first trip DTC.

With GST


  1. Start the engine and wait for at least 10 seconds.

CAUTION:

When the ambient temperature is −20В°C (−4В°F) or less and the engine is cold, warm up the engine for approximately 5 minutes.

  1. Check the first trip DTC.

Is “P0848”detected? YES >> Go to TM-196, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK SECONDARY PRESSURE SENSOR POWER SUPPLY CIRCUIT

  1. Turn ignition switch OFF.
  2. Disconnect CVT unit connector.
  3. Turn ignition switch ON.
  4. Check voltage between CVT unit harness connector terminal and ground.

Is the inspection result normal?


Is the inspection result normal? YES >> GO TO 2.

NO >> Repair or replace malfunctioning parts.

2.CHECK SECONDARY PRESSURE SENSOR SIGNAL CIRCUIT

  1. Turn ignition switch OFF.
  2. Disconnect TCM connector.
  3. Check continuity between TCM harness connector terminals.

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

NO >> Repair or replace malfunctioning parts.

 

3.CHECK TCM INPUT SIGNALS

  1. Connect all connectors removed.
  2. Start the engine.
  3. Check voltage between TCM connector terminal and ground.

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

NO >> There is a malfunction of secondary pressure sensor. Replace transaxle assembly. Refer to TM- 283, "Removal and Installation".

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