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Home >> Subaru >> 2006 >> Legacy GT spec.B >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 18 (Automatic Transmission (Diagnostics) 5AT) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0715 Input/Turbine Speed Sensor Circuit

DTC P0715 Input/Turbine Speed Sensor Circuit

WARNING: This page is about a different variant/trim than selected.

DTC DETECTING CONDITION: 

Input signal circuit of TCM is open or shorted.

TROUBLE SYMPTOM: 

WIRING DIAGRAM: 

Fig 1: Input/Turbine Speed Sensor - Wiring Diagram
G05019821
RESISTANCE CHART

Step Check Yes No
1 CHECK TCM I/O SIGNAL. 
Check I/O signal of power supply, ground and PVIGN power supply relay.
< Ref. to ELECTRICAL SPECIFICATION , Transmission Control Module (TCM) I/O Signal. >		 Is TCM I/O signal OK? Go to step 2.  Repair the open or short circuit for power supply and ground. Perform the diagnosis according to DTC P0882 for PVIGN power supply relay.
2 CHECK TCM AND TRANSMISSION HARNESS CONNECTOR. 
  1. Disconnect the connectors from TCM and transmission.
  2. Measure the resistance of harness between TCM connector and transmission connector.

    Connector & terminal 

    (B54) No. 16 - (B11) No. 7: 

    (B55) No. 16 - (B12) No. 7: 

 Is the resistance less than 1 Ω? Go to step 3.  Repair the open circuit of harness between TCM and transmission connector.
3 CHECK TCM AND TRANSMISSION HARNESS CONNECTOR. 
Measure the resistance of harness between TCM connector and chassis ground.
Connector & terminal 
(B54) No. 16 - Chassis ground: 
(B55) No. 16 - Chassis ground: 		 Is the resistance less than 1 MΩ? Go to step 4.  Repair the short circuit of harness between TCM and transmission connector.
4 CHECK TCM POWER SUPPLY OUTPUT. 
  1. Connect the connector to TCM. (Transmission connector is disconnected)
  2. Turn the ignition switch to ON. (engine OFF)
  3. Measure the voltage between transmission connector and chassis ground.

    Connector & terminal 

    (B11) No. 7 (+) - Chassis ground (-): 

 Is the voltage 10 - 13 V? Go to step 5.  Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . >
5 CHECK HARNESS ASSEMBLY (TURBINE SPEED SENSOR GROUND). 
Check the installing condition of ground connecting harness of harness assembly (used for both of turbine speed sensor 1, rear vehicle speed sensor).		 Is the ground connecting harness installed securely to the transmission body? Is there any serious damage in the harness and terminal? Go to step 6.  When poor installation of ground occurs, install it securely. Replace the transmission assembly if the harness or terminal is damaged. < Ref. to AUTOMATIC TRANSMISSION ASSEMBLY . >
6 CHECK HARNESS ASSEMBLY. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from transmission.
  3. Disconnect the connector from turbine speed sensor 1.
  4. Measure the resistance between transmission connector and turbine speed sensor 1 connector.

    Connector & terminal 

    (T4) No. 7 - (AT1) No.3: 

    (T3) No. 7 - (AT1) No. 2: 

    (AT1) No. 1 - Chassis ground: 

 Is the resistance less than 1 Ω? Go to step 7.  Repair the open circuit of harness between TCM and transmission connector, or poor contact of connector.
7 CHECK HARNESS ASSEMBLY. 
Measure the resistance between transmission connector and chassis ground.
Connector & terminal 
(T4) No. 7 - Chassis ground: 
(T3) No. 7 - Chassis ground: 		 Is the resistance more than 1 MΩ? Go to step 8.  Repair the short circuit of harness between TCM and transmission connector.
8 CHECK INPUT SIGNAL FOR TCM USING SUBARU SELECT MONITOR. 
  1. Connect all connectors.
  2. Lift-up the vehicle and support with rigid racks.
    NOTE: Raise all wheels off floor.
  3. Start the engine, and set the vehicle in 4th speed driving condition of manual mode.
    NOTE: Turbine speed sensor 1 signal can be measured only on 4th speed.
  4. Read the current data of turbine speed sensor 1 using the Subaru Select Monitor. < Ref. to READ CURRENT DATA , OPERATION, Subaru Select Monitor. >
NOTE: The speed difference between front and rear wheels may light the ABS warning light, but this does not indicate a malfunction. When AT control diagnosis is finished, perform the VDC memory clearance procedure of on-board diagnostics system. < Ref. to CLEAR MEMORY MODE . >
 Does the value of the turbine speed sensor 1 change depending on the acceleration, deceleration and shifting range of the vehicle? Even if the SPORT indicator light blinks, the system is in normal condition. A temporary poor contact of connector or harness may be the cause. Repair the poor contact of harness between ATF temperature sensor and transmission connector. Replace the turbine speed sensor 1.< Ref.to5AT-52, Turbine Speed Sensor 1. >
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