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

DTC P1817 SPORT MODE SWITCH CIRCUIT

DTC DETECTING CONDITION:

Input signal circuit of SPORT shift switch is shorted.

TROUBLE SYMPTOM:

• Manual mode can not be set.

• ATF temperature warning light does not illuminate.

• No SPORT mode occurs.

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK BODY INTEGRATED UNIT.

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

2) Turn the ignition switch to ON.

3) Read the DTC of the body integrated unit using the Subaru Select Monitor.

Is DTC displayed?

Perform diagnosis according to the DTC.

2.CHECK BODY INTEGRATED UNIT INPUT SIGNAL.

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

2) Read the “Tiptronic Mode Switch” data of the body integrated unit using the Subaru Select Monitor.

Is “OFF” displayed?

3.CHECK BODY INTEGRATED UNIT INPUT SIGNAL.

1) Move the select lever from the “P” range to the “D” range.

2) Read the “Tiptronic Mode Switch” data of the body integrated unit using the Subaru Select Monitor.

Is the indication on each range OFF?

Replace the select lever assembly.

4.CHECK BODY INTEGRATED UNIT INPUT SIGNAL.

1) Shift the select lever to the SPORT mode side.

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

3) Read the “Tiptronic Mode Switch” data of the body integrated unit using the Subaru Select Monitor.

Is “OFF” displayed?

Replace the select lever assembly.

5.CHECK INHIBITOR SWITCH.

Move the select lever from the “P” range to the “D” range.

Is the indication of range position indicator light in combination meter synchronized with position of select lever?

Adjust the inhibitor switch and select cable.

6.CHECK INPUT SIGNAL FROM TCM.

1) Move the select lever from the “P” range to the “D” range.

2) Read the “Tiptronic Mode Switch” data of the TCM using the Subaru Select Monitor.

Is the indication on each range OFF?

Check for short circuits in the harness or connectors, and repair the fault location.

Replace the TCM.

7.CHECK HARNESS BETWEEN TCM AND SPORT SHIFT SWITCH.

1) Turn the ignition switch to OFF.

2) Disconnect the harness connectors from the TCM and select lever.

3) Measure the resistance between TCM and chassis ground.

Connector & terminal

(B54) No. 17 — Chassis ground:

Is the resistance 1 MΩ or more?

Repair the short circuit in the harness between the TCM and sports shift switch.

8.CHECK SPORT SHIFT SWITCH.

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

2) Measure the resistance between the SPORT shift switch connector terminals.

Connector & terminal

(B117) No. 7 — No. 8:

Is the resistance 1 MΩ or more?

Check the body integrated unit.

Replace the select lever assembly.