DTC P2747: Intermediate Shaft Speed Sensor "B" Circuit No Signal: Notes

1. - 

DTC detecting condition: 

Immediately at fault recognition

Trouble symptom: 

• Standing start problems
• Shock occurs when engaging the lockup clutch.
• Shock occurs when selecting shift position.

Wiring diagram: 

CVT control system Ref. to WIRING SYSTEM>CVT CONTROL SYSTEM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK FUSE  .
   1. Turn the ignition switch to OFF.
   2. Check the M/B fuse No. 21.

   Is the check result OK?

   Yes  : Go to  2 .

   No  : Replace the fuse. If the fuse blows out easily, repair the short circuit of harness.

2. CHECK ECM CONNECTOR  .

   Check the connecting condition of ECM connector.

   Is the ECM connector correctly connected?

   Yes  : Go to  3 .

   No  : Connect the ECM connector correctly.

3. CHECK HARNESS BETWEEN TRANSMISSION CONNECTOR AND MAIN RELAY CONNECTOR  .
   1. Turn the ignition switch to OFF.
   2. Measure the voltage between transmission connector and chassis ground.

   Connector & terminal 

   (T15) No. 19 (+) - Chassis ground (-):

   Is the voltage 10 V or more?

   Yes  : Repair the harness and connector.

   NOTE: In this case, repair the following item:

   • Short circuit to power supply of harness between transmission connector and main relay connector
   • Defective main relay

   No  : Go to  4 .

4. CHECK HARNESS BETWEEN ECM AND MAIN RELAY CONNECTOR  .
   1. Turn the ignition switch to OFF.
   2. Remove the main relay.
   3. Disconnect the ECM connector.
   4. Measure the resistance between the ECM connector and engine ground.

   Connector & terminal 

   (B134) No. 12 - Engine ground:

   Is the resistance 1 MΩ or more?

   Yes  : Go to  5 .

   No  : Repair the short circuit to ground in harness between ECM connector and main relay connector.

5. CHECK HARNESS  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the TCM connector.
   3. Disconnect the primary speed sensor connector.
   4. Measure the resistance between TCM connector and the primary speed sensor connector.

   Connector & terminal 

   (T10) No. 14 - (ATI) No. 2:

   (T10) No. 42 - (AT1) No. 1:

   Is the resistance less than 1 Ω?

   Yes  : Go to  6 .

   No  : Repair the open circuit of harness.

6. CHECK HARNESS  .

   Measure the resistance between TCM connector and chassis ground.

   Connector & terminal 

   (T10) No. 14 - Chassis ground:

   Is the resistance 1 MΩ or more?

   Yes  : Go to  7 .

   No  : Repair the short circuit of harness.

7. CHECK TRANSMISSION HARNESS  .
   1. Install the fuse.
   2. Connect the TCM connector.
   3. Disconnect the transmission connector. (E115, T15)
   4. Turn the ignition switch to ON.
   5. Measure the voltage between transmission connector terminals.

   Connector & terminal 

   (E115) No. 19 (+) - Chassis ground (-):

   Is the voltage 10 - 13 V?

   Yes  : Go to  8 .

   No  : Repair the open circuit of harness or poor contact of connector.

8. CHECK INPUT SIGNAL FOR TCM  .
   1. Turn the ignition switch to OFF.
   2. Connect all connectors.
   3. Lift up the vehicle.
   4. Start the engine.
   5. Set the select lever to "D" range.
   6. Read the data of [Primary Rev Speed] using Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS)>DATA MONITOR .

   Does the value of [Primary Rev Speed] change according to the [Turbine Revolution Speed]?

   Yes  : Current condition is normal. Repair the poor contacts of harnesses of primary speed sensor and transmission connector.

   No  : Go to  9 .

9. CHECK TRANSMISSION HARNESS  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the transmission connector.
   3. Disconnect the primary speed sensor connector.
   4. Measure the resistance between transmission connector and primary speed sensor connector.

   Connector & terminal 

   (T15) No. 19 - (ATI) No. 3:

   Is the resistance less than 1 Ω?

   Yes  : Go to  10 .

   No  : Replace the transmission harness.

10. CHECK PRIMARY SPEED SENSOR  .
    1. Turn the ignition switch to OFF.
    2. Replace the primary speed sensor. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>PRIMARY SPEED SENSOR .
    3. Using the Subaru Select Monitor, perform the clear memory. Ref. to COMMON (DIAG)>CLEAR MEMORY .
    4. Read the DTC using Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Is DTC P2747 displayed?

    Yes  : Go to  11 .

    No  : The original primary speed sensor is defective.

11. CHECK MAIN RELAY  .
    1. Turn the ignition switch to OFF.
    2. Replace the main relay.
    3. Using the Subaru Select Monitor, perform the clear memory. Ref. to COMMON (DIAG)>CLEAR MEMORY .
    4. Read the DTC using Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Is DTC P2747 displayed?

    Yes  : Replace the TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>TRANSMISSION CONTROL MODULE (TCM) .

    No  : The original main relay is defective.