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

DTC P0705 TRANSMISSION RANGE SENSOR CIRCUIT (PRNDL INPUT)

DTC DETECTING CONDITION:

• Inhibitor switch is faulty.

• At least 2 range signal is input.

TROUBLE SYMPTOM:

• Shift characteristics are erroneous.

• The range position of the select lever and the AT select lever position indicator light on the combination meter do not match.

WIRING DIAGRAM:

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1.CHECK INDICATOR LIGHT.

1) Turn the ignition switch to ON.

2) Shift the select lever to “P” range.

Does the “P” range indicator light in the combination meter illuminate?

2.CHECK INDICATOR LIGHT.

Set the select lever to “R” range.

Does the “P” range indicator light in the combination meter illuminate?

3.CHECK INDICATOR LIGHT.

Shift the select lever to “P” range.

Does the “R” range indicator light on combination meter illuminate?

4.CHECK INDICATOR LIGHT.

Does the “N” range indicator light on combination meter illuminate?

5.CHECK INDICATOR LIGHT.

Does the “D” range indicator light on combination meter illuminate?

6.CHECK “P” RANGE SWITCH.

Read the data of “P range” using the Subaru Select Monitor.

Is “ON” displayed?

7.CHECK INDICATOR LIGHT.

Set the select lever to “R” range.

Does the “R” range indicator light on combination meter illuminate?

8.CHECK “R” RANGE SWITCH.

Read the data of “R range” using the Subaru Select Monitor.

Is “ON” displayed?

9.CHECK INDICATOR LIGHT.

Set the select lever to “N” range.

Does the “N” range indicator light on combination meter illuminate?

10.CHECK “N” RANGE SWITCH.

Read the data of “N range” using the Subaru Select Monitor.

Is “ON” displayed?

11.CHECK INDICATOR LIGHT.

Set the select lever to the “D” range.

Does the “D” range indicator light on combination meter illuminate?

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

12.CHECK “D” RANGE SWITCH.

Read the data of “D range” using the Subaru Select Monitor.

Is “ON” displayed?

13.CHECK HARNESS CONNECTOR BETWEEN INHIBITOR SWITCH AND CHASSIS GROUND.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from inhibitor switch.

3) Measure the resistance of harness between inhibitor switch and chassis ground.

Connector & terminal

(T7) No. 1 — Chassis ground:

Is the resistance less than 1 Ω?

Repair the open circuit of harness between inhibitor switch and chassis ground, and poor contact of the connector.

14.CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from TCM and inhibitor switch.

3) Measure the resistance of the harness between TCM and inhibitor switch connector.

Connector & terminal

(B55) No. 14 — (T7) No. 2:

Is the resistance less than 1 Ω?

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

15.CHECK INPUT SIGNAL FOR TCM.

1) Turn the ignition switch to OFF.

2) Connect the connector to TCM and inhibitor switch.

3) Turn the ignition switch to ON.

4) Shift the select lever to “P” range.

5) Measure the voltage between TCM and chassis ground.

Connector & terminal

(B55) No. 14 (+) — Chassis ground (−):

Is the voltage less than 1 V?

16.CHECK INPUT SIGNAL FOR TCM.

1) Set the select lever to other than “P” range.

2) Measure the voltage between TCM and chassis ground.

Connector & terminal

(B55) No. 14 (+) — Chassis ground (−):

Is the voltage 8 V or more?

Replace the TCM.

17.CHECK BODY INTEGRATED UNIT.

Read the data of the “Inhibitor Switch” using the Subaru Select Monitor.

Is “7” displayed?

Check the body integrated unit.

18.CHECK BODY INTEGRATED UNIT.

Check the DTC of body integrated unit.

Is DTC of CAN communication displayed?

Perform diagnosis according to the DTC.

19.CHECK COMBINATION METER.

Check the “P” range indicator light.

Is the “P” range indicator light bulb OK?

Replace the combination meter assembly.

20.CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH.

1) Turn the ignition switch to OFF.

2) Disconnect the connectors from TCM, inhibitor switch and combination meter.

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

Connector & terminal

(B55) No. 14 — Chassis ground:

Is the resistance 1 MΩ or more?

Repair ground short circuit in “P” range circuit.

21.CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from TCM and inhibitor switch.

3) Measure the resistance of the harness between TCM and inhibitor switch connector.

Connector & terminal

(B55) No. 13 — (T7) No. 5:

Is the resistance less than 1 Ω?

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

22.CHECK INPUT SIGNAL FOR TCM.

1) Turn the ignition switch to OFF.

2) Connect the connector to TCM and inhibitor switch.

3) Turn the ignition switch to ON.

4) Set the select lever to “R” range.

5) Measure the voltage between TCM and chassis ground.

Connector & terminal

(B55) No. 13 (+) — Chassis ground (−):

Is the voltage less than 1 V?

23.CHECK INPUT SIGNAL FOR TCM.

1) Set the select lever to a range other than “R”.

2) Measure the voltage between TCM and chassis ground.

Connector & terminal

(B55) No. 13 (+) — Chassis ground (−):

Is the voltage 8 V or more?

Replace the TCM.

24.CHECK BODY INTEGRATED UNIT.

Using the Subaru Select Monitor, read the data of “Shift Position”.

Is “6” displayed?

Check the body integrated unit.

25.CHECK BODY INTEGRATED UNIT.

Check the DTC of body integrated unit.

Is DTC of CAN communication displayed?

Perform diagnosis according to the DTC.

26.CHECK COMBINATION METER.

Check the “R” range indicator light.

Is the “R” range indicator light OK?

Replace the combination meter assembly.

27.CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH.

1) Turn the ignition switch to OFF.

2) Disconnect the connectors from TCM, inhibitor switch and combination meter.

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

Connector & terminal

(B55) No. 13 — Chassis ground:

Is the resistance 1 MΩ or more?

Repair ground short circuit in “R” range circuit.

28.CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from TCM and inhibitor switch.

3) Measure the resistance of the harness between TCM and inhibitor switch connector.

Connector & terminal

(B55) No. 11 — (T7) No. 3:

Is the resistance less than 1 Ω?

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

29.CHECK INPUT SIGNAL FOR TCM.

1) Turn the ignition switch to OFF.

2) Connect the connector to TCM and inhibitor switch.

3) Turn the ignition switch to ON.

4) Set the select lever to “N” range.

5) Measure the voltage between TCM and chassis ground.

Connector & terminal

(B55) No. 11 (+) — Chassis ground (−):

Is the voltage less than 1 V?

30.CHECK INPUT SIGNAL FOR TCM.

1) Set the select lever to a range other than “N”.

2) Measure the voltage between TCM and chassis ground.

Connector & terminal

(B55) No. 11 (+) — Chassis ground (−):

Is the voltage 8 V or more?

Replace the TCM.

31.CHECK BODY INTEGRATED UNIT.

Using the Subaru Select Monitor, read the data of “Shift Position”.

Is “5” displayed?

Check the body integrated unit.

32.CHECK BODY INTEGRATED UNIT.

Check the DTC of body integrated unit.

Is DTC of CAN communication displayed?

Perform diagnosis according to the DTC.

33.CHECK COMBINATION METER.

Check the “N” range indicator light.

Is the “N” range indicator light OK?

Replace the combination meter assembly.

34.CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH.

1) Turn the ignition switch to OFF.

2) Disconnect the connectors from TCM, inhibitor switch and combination meter.

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

Connector & terminal

(B55) No. 11 — Chassis ground:

Is the resistance 1 MΩ or more?

Repair the ground short circuit in “N” range circuit.

35.CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from TCM and inhibitor switch.

3) Measure the resistance of the harness between TCM and inhibitor switch connector.

Connector & terminal

(B55) No. 10 — (T7) No. 4:

Is the resistance less than 1 Ω?

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

36.CHECK INPUT SIGNAL FOR TCM.

1) Turn the ignition switch to OFF.

2) Connect the connector to TCM and inhibitor switch.

3) Turn the ignition switch to ON.

4) Set the select lever to the “D” range.

5) Measure the voltage between TCM and chassis ground.

Connector & terminal

(B55) No. 10 (+) — Chassis ground (−):

Is the voltage less than 1 V?

37.CHECK INPUT SIGNAL FOR TCM.

1) Set the select lever to a range other than “D”.

2) Measure the voltage between TCM and chassis ground.

Connector & terminal

(B55) No. 10 (+) — Chassis ground (−):

Is the voltage 8 V or more?

Replace the TCM.

38.CHECK BODY INTEGRATED UNIT.

Read the data of the “Inhibitor Switch” using the Subaru Select Monitor.

Is “4” displayed?

Check the body integrated unit.

39.CHECK BODY INTEGRATED UNIT.

Check the DTC of body integrated unit.

Is DTC of CAN communication displayed?

Perform diagnosis according to the DTC.

40.CHECK COMBINATION METER.

Check the “D” range indicator light.

Is the “D” range indicator light OK?

Replace the combination meter assembly.

41.CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH.

1) Turn the ignition switch to OFF.

2) Disconnect the connectors from TCM, inhibitor switch and combination meter.

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

Connector & terminal

(B55) No. 10 — Chassis ground:

Is the resistance 1 MΩ or more?

Repair ground short circuit in “D” range circuit.

42.CHECK FOR POOR CONTACT.

Is there poor contact in the inhibitor switch circuit?

Repair the poor contact.

43.CHECK INHIBITOR SWITCH.

Is the inhibitor switch in a normal position?

Replace the TCM.

Adjust inhibitor switch and select cable.