Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc p0705 transmission range sensor "a" circuit (prndl input)

Subaru Legacy BN/BS (2015-2019) Service Manual / Continuously variable transmission (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p0705 transmission range sensor "a" circuit (prndl input)

DTC DETECTING CONDITION:

Immediately at fault recognition

TROUBLE SYMPTOM:

• Shift characteristics are erroneous.

• The range position of the select lever and the position of shift indicator display do not match.

1. ENGINE TYPE FB

WIRING DIAGRAM:

CVT control system CVT Control System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK INPUT SIGNAL FOR TCM. 1) Turn the ignition switch to ON. 2) Move the select lever to each range, and read the data of «P Range», «R Range Signal», «N Range» and «D Range Signal» using the Subaru Select Monitor.	Is display “OFF” for the range other than corresponding range-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0705 TRANSMISSION RANGE SENSOR "A" CIRCUIT (PRNDL INPUT)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0705 TRANSMISSION RANGE SENSOR "A" CIRCUIT (PRNDL INPUT)
2.CHECK HARNESS. 1) Turn the ignition switch to OFF. 2) Disconnect the connector of TCM and inhibitor switch. 3) Measure the resistance between TCM connector and chassis ground. Connector & terminal (T10) No. 38 — Chassis ground: (T10) No. 37 — Chassis ground: (T10) No. 36 — Chassis ground: (T10) No. 35 — Chassis ground:	Is each resistance 1 M- or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0705 TRANSMISSION RANGE SENSOR "A" CIRCUIT (PRNDL INPUT)	Repair the short circuit of transmission harness.
3.CHECK INHIBITOR SWITCH. Move the select lever to each range, and measure the resistance between inhibitor switch terminals. Connector & terminal No. 2 — No. 1: No. 5 — No. 1: No. 3 — No. 1: No. 4 — No. 1:	Is the resistance other than corresponding range 1 M- or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0705 TRANSMISSION RANGE SENSOR "A" CIRCUIT (PRNDL INPUT)	Replace the inhibitor switch. Inhibitor Switch
4.CHECK FOR POOR CONTACT.	Is there poor contact between TCM, inhibitor switch, transmission ground-	Repair the poor contact.	Replace the TCM. Transmission Control Module (TCM)

2. ENGINE TYPE EZ

WIRING DIAGRAM:

CVT control system CVT Control System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK INPUT SIGNAL FOR TCM. 1) Turn the ignition switch to ON. 2) Move the select lever to each range, and read the data of «P Range», «R Range Signal», «N Range» and «D Range Signal» using the Subaru Select Monitor.	Is display “OFF” for the range other than corresponding range-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0705 TRANSMISSION RANGE SENSOR "A" CIRCUIT (PRNDL INPUT)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0705 TRANSMISSION RANGE SENSOR "A" CIRCUIT (PRNDL INPUT)
2.CHECK HARNESS. 1) Turn the ignition switch to OFF. 2) Disconnect the TCM and transmission connectors. 3) Measure the resistance between TCM connector and chassis ground. Connector & terminal (B54) No. 38 — Chassis ground: (B54) No. 37 — Chassis ground: (B54) No. 36 — Chassis ground: (B54) No. 35 — Chassis ground:	Is each resistance 1 M- or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0705 TRANSMISSION RANGE SENSOR "A" CIRCUIT (PRNDL INPUT)	Repair the short circuit of body harness.
3.CHECK HARNESS. 1) Disconnect the inhibitor switch connector. 2) Measure the resistance between transmission connector and chassis ground. Connector & terminal (T3) No. 3 — Chassis ground: (T3) No. 2 — Chassis ground: (T3) No. 1 — Chassis ground: (T3) No. 8 — Chassis ground:	Is each resistance 1 M- or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0705 TRANSMISSION RANGE SENSOR "A" CIRCUIT (PRNDL INPUT)	Repair the short circuit of transmission harness.
4.CHECK INHIBITOR SWITCH. Move the select lever to each range, and measure the resistance between inhibitor switch terminals. Connector & terminal No. 2 — No. 1: No. 5 — No. 1: No. 3 — No. 1: No. 4 — No. 1:	Is the resistance other than corresponding range 1 M- or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0705 TRANSMISSION RANGE SENSOR "A" CIRCUIT (PRNDL INPUT)	Replace the inhibitor switch. Inhibitor Switch
5.CHECK FOR POOR CONTACT.	Is there poor contact between TCM, inhibitor switch, transmission ground-	Repair the poor contact.	Replace the TCM. Transmission Control Module (TCM)

3. OUTLINE OF DIAGNOSIS

• Detect the malfunction of Range Switch.

• Judge as NG if more than one input of Range Switch are detected.

4. EXECUTION CONDITION

Secondary Parameters	Execution condition
12 V battery system voltage	≥ 10 V
Engine speed	≥ 500 rpm

5. DIAGNOSTIC METHOD

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

Malfunction Criteria

Threshold Value

Two or more transmission range switches ON

NOTE:

“Transmission range switch ON” is defined as transmission range switch input voltage < 1.7 V.

True

Time Needed for Diagnosis: 3 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

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