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

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: 

• Non-turbo model

  CVT control system Ref. to WIRING SYSTEM>CVT Control System>WIRING DIAGRAM>NON-TURBO MODEL .

  Fig 1: Intermediate Shaft Speed Sensor (B) Circuit NO Signal System Wiring Diagram (Non-Turbo Model)

  Courtesy of SUBARU OF AMERICA, INC.
• Turbo model

  CVT control system Ref. to WIRING SYSTEM>CVT Control System>WIRING DIAGRAM>TURBO MODEL .

1. CHECK FUSE. 
   1. Turn the ignition switch to OFF.
   2. Remove the fuse (7.5 A) from the fuse holder.
   3. Check the fuse.

   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 HARNESS. 
   1. Disconnect the TCM connector.
   2. Remove the self shut relay.
   3. Measure the resistance between TCM connector and relay holder.

      Connector & terminal 

      (B54) No. 25 - (B220) No. 16:

      (B54) No. 8 - (B220) No. 15:

      (B54) No. 24 - (B220) No. 15:

      (B54) No. 40 - (B220) No. 15:

   Is the resistance less than 1 Ω?

   • Yes  : Go to 3. 
   • No  : Repair the open circuit of harness.
3. CHECK HARNESS. 

   Measure the resistance between TCM connector and chassis ground.

   Connector & terminal 

   (B54) No. 25 - Chassis ground:

   (B54) No. 8 - Chassis ground:

   (B54) No. 24 - Chassis ground:

   (B54) No. 40 - Chassis ground:

   Is the resistance 1 MΩ or more?

   • Yes  : Go to 4. 
   • No  : Repair the short circuit of harness.
4. CHECK RELAY POWER SUPPLY. 

   Measure the voltage between relay holder and chassis ground.

   Connector & terminal 

   (B220) No. 14 (+) - Chassis ground (-):

   (B220) No. 17 (+) - Chassis ground (-):

   Is the voltage 10 V or more?

   • Yes  : Go to 5. 
   • No  : Repair the open or short circuit of harness.
5. CHECK SELF SHUT RELAY. 

   Measure the resistance between self shut relay terminals.

   Terminals 

   No. 16 - No. 17:

   Is the resistance 110 - 140 Ω?

   • Yes  : Go to 6. 
   • No  : Replace the self shut relay.
6. CHECK SELF SHUT RELAY. 

   Measure the resistance between self shut relay terminals.

   Terminals 

   No. 14 - No. 15:

   Is the resistance 1 MΩ or more?

   • Yes  : Go to 7. 
   • No  : Replace the self shut relay.
7. CHECK INPUT SIGNAL FOR TCM. 
   1. Connect the TCM connector.
   2. Install the self shut relay.
   3. Read the data of [Control Module Voltage] using Subaru Select Monitor.

   Is [Control Module Voltage] 10 V or more?

   • Yes  : Current condition is normal. Check for poor contact in connectors or harnesses, and repair the defective part.
   • No  : Go to 8. 
8. CHECK HARNESS. 
   1. Turn the ignition switch to OFF.
   2. Disconnect the TCM connector.
   3. Disconnect the transmission connector.
   4. Measure the resistance between TCM connector and transmission connectors.

      Connector & terminal 

      Non-turbo model 

      (B54) No. 14 - (B12) No. 8:

      (B54) No. 42 - (B12) No. 7:

      (B550) No. 20 - (B12) No. 6:

      Turbo model 

      (B54) No. 26 - (B11) No. 20:

      (B54) No. 42 - (B11) No. 13:

      (B54) No. 14 - (B12) No. 6:

      (B54) No. 42 - (B12) No. 7:

      (B550) No. 20 - (B12) No. 5:

   Is the resistance less than 1 Ω?

   • Yes  : Go to 9. 
   • No  : Repair the open circuit of harness.
9. CHECK HARNESS. 

   Measure the resistance between TCM connector and chassis ground.

   Connector & terminal 

   (B54) No. 14 - Chassis ground:

   Is the resistance 1 MΩ or more?

   • Yes  : Go to 10. 
   • No  : Repair the short circuit of harness.
10. CHECK HARNESS. 

    Measure the resistance between relay holder and fuse holder.

    Connector & terminal 

    (B220) No. 15 - (B550) No. 8:

    Is the resistance less than 1 Ω?

    • Yes  : Go to 11. 
    • No  : Repair the open circuit of harness.
11. CHECK TRANSMISSION HARNESS. 
    1. Install the fuse.
    2. Connect the TCM connector.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between transmission connector terminals.

       Connector & terminal 

       Non-turbo model 

       (B12) No. 6 (+) - Chassis ground (-):

       Turbo model 

       (B12) No. 5 (+) - Chassis ground (-):

    Is the voltage 10 - 13 V?

    • Yes  : Go to 12. 
    • No  : Repair the open circuit of harness or poor contact of connector.
12. CHECK INPUT SIGNAL FOR TCM. 
    1. Turn the ignition switch to OFF.
    2. Connect the transmission connector.
    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.

    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 13. 
13. 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 

       Non-turbo model 

       (T3) No. 6 - (AT1) No. 3:

       (T3) No. 7 - (AT1) No. 1:

       (T3) No. 8 - (AT1) No. 2:

       Turbo model 

       (T3) No. 5 - (AT1) No. 1:

       (T3) No. 6 - (AT1) No. 2:

       (T3) No. 7 - (AT1) No. 3:

    Is the resistance less than 1 Ω?

    • Yes  : Go to 14. 
    • No  : Replace the transmission harness.
14. CHECK PRIMARY SPEED SENSOR HARNESS. 

    Measure the resistance between transmission connector and chassis ground.

    Connector & terminal 

    Non-turbo model 

    (T3) No. 6 - Chassis ground:

    (T3) No. 8 - Chassis ground:

    Turbo model 

    (T3) No. 5 - Chassis ground:

    (T3) No. 6 - Chassis ground:

    Is the resistance 1 MΩ or more?

    • Yes  : Go to 15. 
    • No  : Repair the short circuit of harness.
15. 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 . Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR690)>Primary Speed Sensor .
    3. Clear the memory. Ref. to TRANSMISSION (DIAGNOSTICS)>Clear memory .
    4. Read the DTC.

    Is DTC P2747 displayed?

    • Yes  : Go to 16. 
    • No  : The original primary speed sensor is defective.
16. CHECK SELF SHUT RELAY. 
    1. Turn the ignition switch to OFF.
    2. Replace the self shut relay.
    3. Clear the memory. Ref. to TRANSMISSION (DIAGNOSTICS)>Clear memory .
    4. Read the DTC.

    Is DTC P2747 displayed?

    • Yes  : Replace the TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR580)>Transmission Control Module (TCM) . Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR690)>Transmission Control Module (TCM) .
    • No  : The original self shut relay is defective.