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Nissan Sentra B18 (2020-2025) Service Manual: P0746-00 Pressure Control Solenoid a

Nissan Sentra B18 (2020-2025) Service Manual / Transmission & Driveline / Transaxle & Transmission :: Cvt: Re0f15a / Dtc/circuit Diagnosis / P0746-00 Pressure Control Solenoid a

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

P0746

00

PC SOLENOID A

(Pressure Control Solenoid "A" Performance/Stuck Off)

Diagnosis condition

Diagnosis is permitted when all of the following conditions are satisfied:

a) Ignition voltage ≥ 9.01 V

b) Battery voltage ≥ 9.01 V

c) CVT fluid temperature ≥ -20 °C (-4 °F)

d) Lock-up pattern: Lock-up ON or Lock-up OFF

Signal

—

Threshold

When all of the following conditions "a" and "b" are satisfied for the specified period [5sec] continuously.

Keep the same conditions for specified period again after interval.

a) Line pressure sensor pressure < Balanced oil quantity lower limit pressure - Variation

b) Line pressure sensor pressure < Line instruction pressure - Variation

[Interval]

  • Movement of target pressure

    ⇒ Target pressure under satisfied oil pressure difference judgement - Current target pressure ≥ 1 MPa

  • Stop valid judgement ⇒ Nissan Sentra Vehicle speed ≤ 3 km/h (2 MPH)

Diagnosis delay time

5 seconds × 2 count

POSSIBLE CAUSE

FAIL-SAFE

DTC CONFIRMATION PROCEDURE

  1. PREPARATION BEFORE WORK

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

    TESTING CONDITION:

    Before performing the following procedure, confirm that battery voltage is more than 10 V.

    >>

    GO TO 2.

  2. CHECK DTC DETECTION

    1. Start the engine.

    2. Drive the Nissan Sentra vehicle and maintain the following conditions for 20 seconds or more.

      Shift position

      : "D" position

      CVT fluid temperature

      : 25 °C (77 °F) - 120 °C (248 °F)

      Nissan Sentra Vehicle speed

      : 40 km/h (25 MPH) or more

      CAUTION:

      Be careful of the driving speed.

    3. Stop the Nissan Sentra vehicle.

    4. Repeat step 2 to 3.

    5. Check the DTC.

    Is "P0746-00" detected?

    YES >>

    Proceed to Diagnosis Procedure.

    NO-1>>

    To check malfunction symptom before repair: Refer to Intermittent Incident.

    NO-2>>

    Confirmation after repair: INSPECTION END

Diagnosis Procedure

Diagnosis Procedure

  1. INSPECT CVT STEEL BELT

    Inspect the CVT steel belt. Refer to Component Inspection.

    Is CVT steel belt OK?

    YES >>

    GO TO 2.

    NO >>

    GO TO 4.

  2. CHECK LINE PRESSURE SOLENOID VALVE CIRCUIT - 1

    1. Disconnect TCM harness connector.

    2. Disconnect CVT unit harness connector.

    3. Check resistance between TCM harness connector terminal and CVT unit harness connector terminal.

      TCM

      CVT unit

      Resistance

      Connector

      Terminal

      Connector

      Terminal

      F23

      30

      F46

      1

      1 Ω or less
       

    Is the inspection result normal?

    YES >>

    GO TO 3.

    NO >>

    Repair harness or connector.

  3. REPLACE CONTROL VALVE

    Replace control valve. Refer to Removal and Installation.

    >>

    GO TO 6.

  4. CHECK LINE PRESSURE SOLENOID VALVE CIRCUIT - 2

    1. Disconnect TCM harness connector.

    2. Disconnect CVT unit harness connector.

    3. Check resistance between TCM harness connector terminal and CVT unit harness connector terminal.

      TCM

      CVT unit

      Resistance

      Connector

      Terminal

      Connector

      Terminal

      F23

      30

      F46

      1

      1 Ω or less
       

    Is the inspection result normal?

    YES >>

    GO TO 5.

    NO >>

    1. Repair harness or connector.

    2. GO TO 5.

  5. REPLACE BELT AND PULLEYS

    Replace belt and pulleys. Refer to Disassembly and Assembly.

    >>

    GO TO 6.

  6. CHECK DTC DETECTION

    Perform DTC confirmation procedure. Refer to Diagnosis Procedure.

    Is "P0746-00" detected again?

    YES >>

    Replace TCM. Refer to Removal and Installation.

    NO >>

    INSPECTION END

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