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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 P0712 Transmission Fluid Temperature Sensor Circuit Low Input

DTC P0712 Transmission Fluid Temperature Sensor Circuit Low Input

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

DTC DETECTING CONDITION: 

Input signal circuit to ATF temperature sensor 1 is open.

TROUBLE SYMPTOM: 

Excessive shift shock

WIRING DIAGRAM: 

Fig 1: Transmission Fluid Temperature Sensor - Wiring Diagram
G05019819
RESISTANCE CHART

Step Check Yes No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors from TCM and transmission.
  3. Measure the resistance of harness between TCM and transmission connector.

    Connector & terminal 

    (B54) No. 13 - (B11) No. 12: 

    (B54) No. 2 - (B11) No. 5: 

 Is the resistance less than 1 Ω? Go to step 2.  Repair the open circuit of harness between TCM and transmission connector.
2 CHECK ATF TEMPERATURE SENSOR. 
  1. Turn the ignition switch to OFF.
  2. Connect the connectors to transmission and TCM.
  3. Turn the ignition switch to ON and start engine.
  4. Warm-up the transmission until the ATF temperature reaches to 80°C (176°F).
    NOTE: If the ambient temperature is below 0°C (32°F), drive the vehicle until the ATF reaches its operating temperature.
  5. Disconnect the connector from transmission.
  6. Measure the resistance between transmission connector terminals.

    Connector & terminal 

    (T4) No. 5 - (T4) No. 12: 

 Is the resistance between 500 - 1,200 Ω? Go to step 3.  Go to step 5. 
3 CHECK ATF TEMPERATURE SENSOR. 
Measure the resistance between transmission connector terminals.
Connector & terminal 
(T4) No. 5 - (T4) No. 12: 		 Does the resistance value increase while the ATF temperature decreases? Go to step 4.  Go to step 5. 
4 CHECK INPUT SIGNAL FOR TCM USING SUBARU SELECT MONITOR. 
  1. Connect the connector.
  2. Turn the ignition switch to ON. (engine OFF)
  3. Read the ATF temperature using Subaru Select Monitor.
 Does the ATF temperature gradually decrease? 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. 
5 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 

    (T4) No. 12 - (T5) No. 1: 

    (T4) No. 5 - (T5) No. 16: 

 Is the resistance less than 1 Ω? Replace the control valve body. < Ref. to CONTROL VALVE BODY . > Repair the open circuit of harness between transmission connector and control valve body connector.
6 CHECK POOR CONTACT.  Is there poor contact in ATF temperature sensor 1 circuit? Repair the poor contact. Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . >
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