DTC P0712 Transmission Fluid Temperature Sensor Circuit Low Input: Wiring Diagram

Fig 1: ATF Temperature Sensor - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK HARNESS.  Turn the ignition switch to OFF. Disconnect the TCM and transmission connectors. Measure the resistance of harness between TCM connector and chassis ground. Connector & terminal  (B54) No. 3 - Chassis ground:  (B54) No. 16 - Chassis ground:	Is the resistance 1 MΩ or more?	Go to step 2  .	Repair the short circuit of harness.
2 CHECK HARNESS.  Measure the resistance between TCM connector and transmission body. Connector & terminal  (T4) No. 16 - Transmission body:  (T4) No. 19 - Transmission body:	Is the resistance 1 MΩ or more?	Go to step 3  .	Repair the short circuit of harness.
3 CHECK HARNESS INSIDE TRANSMISSION.  CAUTION: Start work after ATF cools down. Remove the transmission oil pan. Check for the harness pinch, damage.	Is there any malfunction in harness?	Go to step 4  .	Replace the transmission harness.
4 CHECK ATF TEMPERATURE SENSOR.  Measure the resistance between transmission connector terminals. Connector & terminal  (T4) No. 16 - No. 19:	Is resistance as follows? Fluid temperature 0°C → approx. 6.2 kΩ Fluid temperature 20°C → approx. 2.6 kΩ Fluid temperature 80°C → approx. 370 Ω	Check the TCM.	Replace the transmission harness.