Nissan Versa (N17): P0848 Transmission fluid pressure SEN/SW B

Nissan Versa 2nd generation (N17) Service Manual / Transmission & driveline / Transaxle & transmission (TM) / P0848 Transmission fluid pressure SEN/SW B

DTC Logic

DTC DETECTION LOGIC

DTC Trouble diagnosis name DTC detection condition Possible causes
P0848 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: −20C (−4F) or more

- 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.
  5. Check the first trip DTC.

FLUID TEMP : −19C (−2.2F) or more

With GST

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

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

  2. Check the first trip DTC.

Is "P0848"detected?

YES >> Go to TM "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?

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.   

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 harness connector terminal and ground. 

Is the inspection result normal?

YES >> Check intermittent incident. Refer to GI "Intermittent Incident".

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

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