DTC P2746 Primary Pulley Revolution Speed Sensor Circuit: Wiring Diagram

Fig 1: Primary Speed Sensor - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK FUSE.  Turn the ignition switch to OFF. Remove the fuse (No. 38).	Is the fuse OK?	Go to step 2  .	Replace the fuse. If the fuse blows out easily, repair the short circuit of harness.
2 CHECK HARNESS.  Turn the ignition switch to OFF. Disconnect the TCM and transmission connectors. Measure the resistance between TCM connector and transmission connectors. Connector & terminal  (B54) No. 1 - (B12) No. 7:  (B54) No. 6 - (B12) No. 6:  (M/B No. 38) No. 2 - (B12) No. 5:	Is the resistance less than 1 Ω?	Go to step 3  .	Repair the open circuit of harness.
3 CHECK HARNESS.  Measure the resistance between TCM connector and chassis ground. Connector & terminal  (B12) No. 5 - Chassis ground:  (B12) No. 6 - Chassis ground:	Is the resistance 1 MΩ or more?	Go to step 4  .	Repair the short circuit of harness.
4 CHECK TRANSMISSION HARNESS.  Connect the TCM connector. Turn the ignition switch to ON. Measure the voltage between transmission connector and chassis ground. Connector & terminal  (B12) No. 6 (+) - Chassis ground (-):  NOTE: Delete the TCM memory after completing the CVT control system diagnosis. Ref. to CLEAR MEMORY MODE .	Is the voltage approx. 5 V?	Go to step 5  .	Repair the open circuit of harness or poor contact of connector.
5 CHECK INPUT SIGNAL FOR TCM.  Turn the ignition switch to OFF. Connect the transmission connector. Lift up the vehicle. Start the engine. Slowly increase the speed to 30 km/h (18 MPH). Read the data of "Primary Pulley Speed" using Subaru Select Monitor.	Does the value of "Primary Pulley Speed" change according to the engine speed?	Current condition is normal. Repair the poor contacts of harnesses of primary speed sensor and transmission connector.	Go to step 6  .
6 CHECK TRANSMISSION HARNESS.  Turn the ignition switch to OFF. Disconnect the transmission connector. Disconnect the primary speed sensor connector. Measure the resistance between transmission connector and primary speed sensor connector. Connector & terminal  (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?	Replace the primary speed sensor. Ref. to PRIMARY SPEED SENSOR .	Replace the transmission harness.