DTC P0751 Shift Solenoid "A" Performance Or Stuck Off

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

DTC DETECTING CONDITION:

Output signal of front brake solenoid does not match with oil pressure.

TROUBLE SYMPTOM:

Locked to 4th or 5th gear.

WIRING DIAGRAM:

Fig 1: Shift Solenoid - Wiring Diagram

RESISTANCE CHART

Step	Check	Yes	No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Turn the ignition switch to OFF. Disconnect the connectors from TCM and transmission. Measure the resistance of harness between TCM and transmission connector. Connector & terminal (B54) No. 24 - (B11) No. 17: (B55) No. 17 - (B11) No. 3: (B54) No. 5 - Chassis ground: (B54) No. 14 - Chassis ground:	Is the resistance less than 1 Ω?	Go to step 2.	Repair the open circuit of harness between TCM and transmission connector.
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND CHASSIS GROUND. Measure the resistance of harness between TCM connector and chassis ground. Connector & terminal (B55) No. 17 - Chassis ground:	Is the resistance more than 1 MΩ?	Go to step 3.	Repair the short circuit of harness between TCM and transmission connector.
3 CHECK INPUT SIGNAL FOR TCM USING SUBARU SELECT MONITOR. Connect all connectors. Turn the ignition switch to ON. (Engine OFF) Check input signal of FR/B oil pressure SW.	Is OFF displayed?	Go to step 4.	Go to step 6.
4 CHECK INPUT SIGNAL FOR TCM USING SUBARU SELECT MONITOR. Turn the ignition switch to OFF. Turn the ignition switch to ON. (Engine ON) Shift to 1st speed while checking the current gear position using Subaru Select Monitor. Check input signal of FR/B oil pressure SW.	Is ON displayed?	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 in the solenoid output and oil pressure SW input.	Go to step 5.
5 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND CONTROL VALVE BODY. Turn the ignition switch to OFF. Disconnect the connector from transmission. Remove the transmission connector from bracket. Lift up the vehicle and place it on rigid racks. NOTE: Raise all wheels off floor. Drain the ATF. CAUTION: Do not drain ATF until it cools down. Remove the oil pan, and disconnect the control valve body connector. Measure the resistance between transmission connector and control valve body connector. Connector & terminal (B11) No. 17 - (T16) No. 9: (B11) No. 3 - (T15) No. 11:	Is the resistance less than 1 Ω?	Replace the control valve body. < Ref. to CONTROL VALVE BODY . >	Replace the transmission harness assembly.
6 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND CONTROL VALVE BODY. Turn the ignition switch to OFF. Disconnect the connector from transmission. Remove the transmission connector from bracket. Lift up the vehicle and place it on rigid racks. NOTE: Raise all wheels off floor. Drain the ATF. CAUTION: Do not drain ATF until it cools down. Remove the oil pan, and disconnect the control valve body connector. Measure the resistance between transmission ground and control valve body connector. Connector & terminal (T4) No. 3 - Transmission ground:	Is the resistance more than 1 MΩ?	Replace the control valve body. < Ref. to CONTROL VALVE BODY . >	Replace the transmission harness assembly.