DTC P0758 Shift Solenoid "B" Electrical

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

DTC DETECTING CONDITION:

Output signal circuit of 2-4 brake duty solenoid is open or shorted.

TROUBLE SYMPTOM:

Excessive shift shock

WIRING DIAGRAM:

Fig 1: Wiring Diagram - Shift Solenoid "B" Electrical

Courtesy of SUBARU OF AMERICA, INC.

DTC P0758 DIAGNOSTIC PROCEDURE

Step	CHECK	Yes	No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Turn the ignition switch to OFF. Disconnect the connector from TCM and transmission. Measure the resistance of harness between TCM and transmission connector. Connector & terminal (B55) No. 6 - (B11) No. 3:	Is the resistance less than 1 Ω?	Go to step 2 .	Repair the open circuit in 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. 6 - Chassis ground:	Is the resistance more than 1 MΩ?	Go to step 3 .	Repair the short circuit in harness between TCM and transmission connector.
3 CHECK 2-4 BRAKE DUTY SOLENOID. Measure the resistance between transmission connector terminals. Connector & terminal (T4) No. 3 - No. 20:	Is the resistance 2.0 - 6.0 Ω?	Go to step 4 .	Go to step 7 .
4 CHECK OUTPUT SIGNAL EMITTED FROM TCM USING SUBARU SELECT MONITOR. Connect all the connectors. Connect the Subaru Select Monitor to data link connector. Start the engine, and turn the Subaru Select Monitor switch to ON. Warm-up the transmission until the ATF temperature exceed approx. 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. Stop the engine and turn the ignition switch to ON (engine OFF). Shift the select lever to "N" range, and depress the accelerator pedal. Read the data of "Brake Clutch Duty Ratio" using Subaru Select Monitor. 2-4 brake duty solenoid is indicated in "%".	Is the value 100%?	Go to step 5 .	Go to step 6 .
5 CHECK OUTPUT SIGNAL EMITTED FROM TCM USING SUBARU SELECT MONITOR. Shift the select lever to 2nd on manual mode.	Is the value 0%?	Even if the SPORT indicator light is blinking, the circuit has returned to normal condition at this time. A temporary poor contact of connector or harness may be the cause. Repair the harness or connector in TCM and transmission.	Go to step 6 .
6 CHECK POOR CONTACT.	Is there poor contact in 2-4 brake duty solenoid circuit?	Repair the poor contact.	Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . >
7 CHECK 2-4 BRAKE DUTY SOLENOID (IN TRANSMISSION). Remove the transmission connector from bracket. Drain the ATF. CAUTION: Do not drain the ATF until it cools down. Remove the oil pan, and disconnect the connector from 2-4 brake duty solenoid. Measure the resistance of harness between 2-4 brake duty solenoid connector and transmission ground. Connector & terminal (AT3) No. 6 - Transmission ground:	Is the resistance 2.0 - 6.0 Ω?	Go to step 8 .	Replace the control valve body. < Ref. to CONTROL VALVE BODY . >
8 CHECK HARNESS CONNECTOR BETWEEN 2-4 BRAKE DUTY SOLENOID AND TRANSMISSION. Measure the resistance of harness between 2-4 brake duty solenoid and transmission connector. Connector & terminal (T4) No. 3 - (AT12) No. 6:	Is the resistance less than 1 Ω?	Go to step 9 .	Repair the open circuit in harness between 2-4 brake duty solenoid and transmission connector.
9 CHECK HARNESS CONNECTOR BETWEEN 2-4 BRAKE DUTY SOLENOID AND TRANSMISSION. Measure the resistance of harness between transmission connector and transmission ground. Connector & terminal (T4) No. 3 - Transmission ground:	Is the resistance more than 1 MΩ?	Even if the SPORT indicator light is blinking, the circuit has returned to normal condition at this time. A temporary poor contact of connector or harness may be the cause. Repair the harness or connector in 2-4 brake duty solenoid and transmission.	Repair the short circuit in harness between 2-4 brake duty solenoid and transmission connector.