AUTOMATIC TRANSMISSION (DIAGNOSTICS)(4AT) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P0715 INPUT/TURBINE SPEED SENSOR CIRCUIT

DTC DETECTING CONDITION:

Input signal circuit of TCM is open or shorted.

TROUBLE SYMPTOM:

Excessive shift shock

WIRING DIAGRAM:

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1.CHECK TORQUE CONVERTER TURBINE SPEED SENSOR.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from transmission.

3) Measure the resistance between transmission connector receptacle’s terminals.

Connector & terminal

(T4) No. 5 — No. 10:

Is the resistance 450 — 650 Ω?

Replace the torque converter turbine speed sensor.

2.CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION.

1) Disconnect the connector from TCM.

2) Measure the resistance of the harness between TCM connector and transmission connector.

Connector & terminal

(B55) No. 1 — (B11) No. 5:

Is the resistance less than 1 Ω?

Repair the open circuit of harness between TCM and transmission connector.

3.CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION.

Measure the resistance of the harness between TCM connector and transmission connector.

Connector & terminal

(B55) No. 2 — (B11) No. 10:

Is the resistance less than 1 Ω?

Repair the open circuit of harness between TCM and transmission connector, and poor contact of the connector.

4.CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION.

Measure the resistance of the harness between TCM connector and chassis ground.

Connector & terminal

(B55) No. 2 — Chassis ground:

Is the resistance 1 MΩ or more?

Repair the short circuit of harness between TCM and transmission connector.

5.CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION.

Measure the resistance of the harness between TCM connector and chassis ground.

Connector & terminal

(B55) No. 1 — Chassis ground:

Is the resistance 1 MΩ or more?

Repair the short circuit of the harness between TCM and transmission connector, and poor contact of connector.

6.CHECK INPUT SIGNAL FOR TCM USING SUBARU SELECT MONITOR.

1) Connect the connectors to TCM and transmission.

2) Connect the Subaru Select Monitor to the data link connector.

3) Turn the ignition switch to ON.

4) Run the Subaru Select Monitor.

5) Start the engine.

6) Move the select lever to the “P” or “N” range.

7) Read the data of “Turbine Revolution Speed” using Subaru Select Monitor.

8) Compare the tachometer with Subaru Select Monitor indications.

Is the revolution value same as the tachometer reading shown on the combination meter?

Check for poor contact in the TCM and transmission harness or connectors, and repair the fault location.

7.CHECK FOR POOR CONTACT.

Is there poor contact in torque converter turbine speed sensor circuit?

Repair the poor contact.

Replace the TCM.