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Home >> Subaru >> 2013 >> Legacy Premium, Automatic CVT Trans >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Continuously Variable Transaxle (CVT) (Diagnostics) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0843 Secondary Oil Pressure Sensor Circuit (High) >> Wiring Diagram

DTC P0843 Secondary Oil Pressure Sensor Circuit (High): Wiring Diagram

CVT Control System. See appropriate SYSTEM WIRING DIAGRAM article.

Fig 1: CVT Control System - Wiring Diagram (Secondary Oil Pressure Sensor)
G08318812Courtesy of SUBARU OF AMERICA, INC.
DIAGNOSTIC PROCEDURE

Step Check Yes No
1 CHECK INPUT SIGNAL FOR TCM. 
  1. Start the engine.
  2. Warm up until the ATF temperature reaches to 40 - 70°C (104 - 158°F).
  3. Shift the select lever to "P" range.
  4. Stabilize the engine speed at idle.
  5. Read the data of «Actual secondary pressure» using Subaru Select Monitor.
 Is the «Actual secondary pressure» 0.5 - 1.5 MPa? Check for poor contact of connector. Go to step 2  .
2 CHECK HARNESS. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the TCM and transmission connectors.
  3. Turn the ignition switch to ON.
  4. Measure the voltage between TCM connector and chassis ground.

    Connector & terminal 

    (B54) No. 2 (+) - Chassis ground (-): 

    (B54) No. 17 (+) - Chassis ground (-): 

 Is the voltage approx. 0 V? Go to step 3  . Repair the short circuit of harness.
3 CHECK HARNESS. 
  1. Turn the ignition switch to OFF.
  2. Measure the resistance between TCM connector terminals.

    Connector & terminal 

    (B54) No. 2 - (B54) No. 17: 

 Is the resistance less than 1 Ω? Repair the short circuit of harness. Go to step 4  .
4 CHECK TRANSMISSION HARNESS. 
  1. Disconnect the secondary pressure sensor connector.
  2. Turn the ignition switch to ON.
  3. Measure the voltage between transmission connector and chassis ground.

    Connector & terminal 

    (T3) No. 11 (+) - Chassis ground (-): 

    (T3) No. 12 (+) - Chassis ground (-): 

 Is the voltage approx. 0 V? Go to step 5  . Repair the short circuit of harness.
5 CHECK TRANSMISSION HARNESS. 
  1. Turn the ignition switch to OFF.
  2. Measure the resistance between transmission connector terminals.

    Connector & terminal 

    (T3) No. 11 - (T3) No. 12: 

 Is the resistance less than 1 Ω? Repair the short circuit of harness. Go to step 6  .
6 CHECK SENSOR POWER SUPPLY. 
  1. Connect the connectors of TCM and transmission.
  2. Turn the ignition switch to ON.
  3. Measure the voltage between secondary pressure sensor connector terminals.

    Connector & terminal 

    (AT6) No. 1 (+) - (AT6) No. 3 (-): 

 Is the voltage 4.5 V or more? Replace the secondary pressure sensor. Refer to SECONDARY PRESSURE SENSOR . Check for poor contact of the connector, and repair the defective part.
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