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HOMESERVICE MANUALSSUBARU2022IMPREZA BASE, 4D SEDAN, AUTOMATIC CVT TRANSREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSAUTOMATIC TRANSAXLE (DIAGNOSTICS)DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)DTC P0841: TRANSMISSION FLUID PRESSURE SENSOR/SWITCH "A" CIRCUIT RANGE/PERFORMANCENOTES
2022 Subaru Impreza Base, 4D Sedan, Automatic CVT Trans

DTC P0841: Transmission Fluid Pressure Sensor/Switch "A" Circuit Range/Performance: Notes

2022 Subaru Impreza Base, 4D Sedan, Automatic CVT TransSECTION Notes

1. - 

DTC detecting condition: 

Detected when two consecutive driving cycles with fault occur.

Trouble symptom: 

  • Acceleration is poor during standing start.
  • Shift control malfunction
  • Engine speed increases abruptly.

Wiring diagram: 

CVT control system Ref. to WIRING SYSTEM (IMPREZA MODEL)>CVT CONTROL SYSTEM .

G10276512Courtesy of SUBARU OF AMERICA, INC.
CAUTION:
  1. CHECK DTC  .

    Read the DTC of [Transmission] using the Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Besides DTC P0841 and P0867, is DTC P0842 or P0843 displayed?

    Yes:  Perform the diagnosis according to DTCs other than P0841 and P0867. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

    No:  Go to  2.

  2. CHECK DTC  .

    Read the DTC of [Transmission] using the Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Besides DTC P0841 and P0867, is DTC P0746 or P0747 displayed?

    Yes:  Perform the diagnosis according to DTC P0867. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC P0867 TRANSMISSION FLUID PRESSURE .

    No:  Go to  3.

  3. CHECK INPUT SIGNAL FOR TCM  .
    1. Turn the ignition switch to ON.
    2. Using the Subaru Select Monitor, read data of [secondary pressure sensor voltage.] in the [Data Monitor] of [Transmission]. (While shaking the secondary pressure sensor harness) Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DATA MONITOR .

    Is [secondary pressure sensor voltage.] 0.39 - 0.61 V?

    Yes:  Go to  11.

    No:  Go to  4.

  4. CHECK HARNESS  .
    CAUTION:

    Start work after ATF cools down. 

    1. Turn the ignition switch to OFF.
    2. Disconnect the TCM connector.
    3. Disconnect the secondary pressure sensor connector.
    4. Measure the resistance between TCM connector and secondary pressure sensor connector.

      Connector & terminal 

      (T10) No. 2 - (AT6) No. 3:

      (T10) No. 5 - (AT6) No. 2:

      (T10) No. 33 - (AT6) No. 1:

    Is the resistance less than 1 Ω?

    Yes:  Go to  5.

    No:  Repair the open circuit of harness.

  5. CHECK HARNESS  .

    Measure the resistance between TCM connectors.

    Connector & terminal 

    (T10) No. 2 - (T10) No. 33:

    (T10) No. 5 - (T10) No. 2:

    (T10) No. 33 - (T10) No. 5:

    Is the resistance 1 MΩ or more?

    Yes:  Go to  6.

    No:  Repair the short circuit of harness.

  6. CHECK HARNESS  .

    Measure the resistance between TCM connector and transmission body.

    Connector & terminal 

    (T10) No. 2 - Transmission body:

    (T10) No. 5 - Transmission body:

    (T10) No. 33 - Transmission body:

    Is the resistance 1 MΩ or more?

    Yes:  Go to  7.

    No:  Repair the short circuit of harness.

  7. CHECK POWER SUPPLY FOR SECONDARY PRESSURE SENSOR  .
    1. Connect the TCM connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage between TCM connectors.

      Connector & terminal 

      (T10) No. 33 (+) - (T10) No. 2 (-):

    Is the voltage 4.6 - 5.4 V?

    Yes:  Go to  8.

    No:  Check for poor contact of connector, and if no fault is found, replace the TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>TRANSMISSION CONTROL MODULE (TCM) .

  8. CHECK POWER SUPPLY FOR SECONDARY PRESSURE SENSOR  .
    1. Turn the ignition switch to OFF.
    2. Connect the secondary pressure sensor connector.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between TCM connectors.

      Connector & terminal 

      (T10) No. 33 (+) - (T10) No. 2 (-):

    Is the voltage 4.6 - 5.4 V?

    Yes:  Go to  9.

    No:  Replace the secondary pressure sensor. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>SECONDARY PRESSURE SENSOR .

  9. CHECK SECONDARY PRESSURE SENSOR OUTPUT  .

    Measure the voltage between TCM connectors.

    Connector & terminal 

    (T10) No. 5 (+) - (T10) No. 2 (-):

    Is the voltage 0.39 - 0.61 V?

    Yes:  Go to  10.

    No:  Check for poor contact of connector, and if no fault is found, replace the TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>TRANSMISSION CONTROL MODULE (TCM) .

  10. CHECK CONNECTOR  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the TCM connector.
    3. Disconnect the secondary pressure sensor connector.
    4. Check the TCM connector (T10) and the secondary pressure sensor connector (AT6).

    Is the check result OK?

    Yes:  Go to  11.

    No:  Repair the connector, or replace harness.

  11. CHECK TRANSMISSION FLUID  .
    1. Connect all connectors.
    2. Check the amount of ATF. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>CVTF>ADJUSTMENT .

    Is the check result OK?

    Yes:  Go to  12.

    No:  Adjust the amount of ATF. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>CVTF>ADJUSTMENT . Go to  12.

  12. CHECK INPUT SIGNAL FOR TCM  .
    1. Using the Subaru Select Monitor, perform the clear memory of [Transmission]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
    2. Start the engine.
    3. Warm up until the ATF temperature reaches to 40 - 70°C (104 - 158°F).
    4. Depress the brake pedal and move the select lever to each range at an interval of five seconds.
      NOTE:

      Move the select lever in the following order: "P" → "R" → "N" → "D" → "N" → "R" → "P". 

    5. Stabilize the engine speed at idle.
    6. Using the Subaru Select Monitor, read data of [Actual Secondary Pressure] in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DATA MONITOR .

    Is [Actual Secondary Pressure] 0.5 - 1.5 MPa?

    Yes:  Go to  13.

    No:  Replace the secondary pressure sensor. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>CONTROL VALVE BODY .

  13. CHECK INPUT SIGNAL FOR TCM  .
    1. Shift the select lever to "P" range.
    2. Keep the engine speed at 3, 000 rpm.
    3. Using the Subaru Select Monitor, read data of [Actual Secondary Pressure] in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DATA MONITOR .

    Is [Actual Secondary Pressure] 1.5 - 2.5 MPa? Is the difference between the actual oil pressure and the value measured in Step 12 0.2 MPa or more?

    Yes:  Replace the transmission assembly. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR580 IMPREZA)>AUTOMATIC TRANSMISSION ASSEMBLY

    No:  Replace the secondary pressure sensor. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR580 IMPREZA)>SECONDARY PRESSURE SENSOR .

RENDER: 1.0x

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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