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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 P0720 Output Speed Sensor Circuit

DTC P0720 Output Speed Sensor Circuit

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

DTC DETECTING CONDITION: 

TROUBLE SYMPTOM: 

WIRING DIAGRAM: 

Fig 1: Harness Connector - Wiring Diagram
G05019823
DIAGNOSTIC PROCEDURE

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. 7 - (B11) No. 1: 

 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 
(B55) No. 7-Chassis ground: 
(B54) 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 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 drive it.
  4. Read the current data of front wheel speed using 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 ABS memory clearance procedure of on-board diagnostics system. < Ref. to CLEAR MEMORY MODE , OPERATION, Subaru Select Monitor. >
 Does the value of the front wheel speed change depending on the acceleration and deceleration 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. Go to step 6. 
6 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND CONTROL VALVE BODY. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from transmission.
  3. Remove the transmission connector from bracket.
  4. Lift up the vehicle and place it on rigid racks.
    NOTE: Raise all wheels off floor.
  5. Drain the ATF.
    CAUTION: Do not drain ATF until it cools down.
  6. Remove the oil pan, and disconnect the connector from control valve body connector.
  7. Measure the resistance between transmission connector and control valve body connector.

    Connector & terminal 

    (B11) No. 7 - (T5) No. 15: 

    (B11) No. 1 - (T5) No. 14: 

 Is the resistance less than 1 Ω? Go to step 7.  Repair the open circuit of harness between control valve body connector and transmission connector.
7 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND CONTROL VALVE BODY. 
Measure the resistance between transmission ground and control valve body connector.
Connector & terminal 
(T15) No. 15 - Transmission ground: 
(T15) No. 14 - Transmission ground: 		 Is the resistance more than 1 MΩ? Go to step 8.  Repair the short circuit of harness between transmission connector and transmission ground.
8 CHECK HARNESS CONNECTOR BETWEEN CONTROL VALVE BODY AND VEHICLE SPEED SENSOR. 
  1. Disconnect the connector from vehicle speed sensor.
  2. Measure the resistance of harness between control valve body connector and vehicle speed sensor connector.

    Connector & terminal 

    (T15) No. 15 - (T7) No. 3: 

    (T15) No. 14 - (T7) No. 2: 

    (T7) No. 1 - Transmission ground: 

 Is the resistance less than 1 Ω? Go to step 9.  Replace the control valve body. < Ref. to CONTROL VALVE BODY . >
9 CHECK HARNESS CONNECTOR BETWEEN CONTROL VALVE BODY AND VEHICLE SPEED SENSOR. 
Measure the resistance of harness between control valve body connector and transmission ground.
Connector & terminal 
(T15) No. 15 - Transmission ground: 
(T15) No. 14 - Transmission ground: 		 Is the resistance more than 1 MΩ? Replace the vehicle speed sensor. Replace the control valve body. < Ref. to CONTROL VALVE BODY . >
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