Toyota Tacoma (2015-2018) Service Manual: Transmission Control Switch Circuit

Toyota Tacoma (2015-2018) Service Manual / Ac60e Automatic Transmission / Transaxle / Automatic Transmission System(for 2tr-fe) / Transmission Control Switch Circuit

DESCRIPTION

After moving the shift lever to S, it is possible to switch the shift range between "1" (S1 range) and "6" (S6 range) using the transmission control switch.

Moving the shift lever to "+" once raises the shift range by one, and moving the shift lever to "-" once lowers the shift range by one.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.	READ VALUE USING TECHSTREAM (SPORTS MODE SELECTION SW)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List.

(e) In accordance with the display on the Techstream, read the Data List.

Engine and ECT

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Sports Mode Selection SW	Sport mode select switch status/ ON or OFF	ON: Shift lever in S, "+" or "-" OFF: Shift lever not in S, "+" or "-"	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Sports Mode Selection SW

Sport mode select switch status/

ON or OFF

ON: Shift lever in S, "+" or "-"
OFF: Shift lever not in S, "+" or "-"

Result

Result	Proceed to
Data display is within Normal Condition range	A
Data display is not within Normal Condition range	B

GO TO STEP 6

2.	READ VALUE USING TECHSTREAM (SPORTS SHIFT UP SW AND SPORTS SHIFT DOWN SW)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List.

(e) In accordance with the display on the Techstream, read the Data List.

Engine and ECT

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Sports Shift Up SW	Sport shift up switch status/ ON or OFF	ON: Shift lever held in "+" (up-shift) OFF: Shift lever not held in "+" (up-shift)	-
Sports Shift Down SW	Sport shift down switch status/ ON or OFF	ON: Shift lever held in "-" (down-shift) OFF: Shift lever not held in "-" (down-shift)	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Sports Shift Up SW

Sport shift up switch status/

ON or OFF

ON: Shift lever held in "+" (up-shift)
OFF: Shift lever not held in "+" (up-shift)

Sports Shift Down SW

Sport shift down switch status/

ON or OFF

ON: Shift lever held in "-" (down-shift)
OFF: Shift lever not held in "-" (down-shift)

Result

Result	Proceed to
Data display is within Normal Condition range	A
Data display is not within Normal Condition range	B

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

3.	INSPECT TRANSMISSION CONTROL SWITCH (TRANSMISSION FLOOR SHIFT ASSEMBLY)

(a) Disconnect T23 transmission control switch (transmission floor shift assembly) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 (SFTU) - 2 (E)	Shift lever held in "+" (Up-shift)	Below 1 Ω
1 (SFTD) - 2 (E)	Shift lever held in "-" (Down-shift)	Below 1 Ω
3 (SFTU) - 2 (E)	Shift lever not held in "+"	10 kΩ or higher
1 (SFTD) - 2 (E)	Shift lever not held in "-"	10 kΩ or higher

Text in Illustration

*a	Component without harness connected (Transmission Control Switch (Transmission Floor Shift Assembly))

REPLACE TRANSMISSION CONTROL SWITCH (TRANSMISSION FLOOR SHIFT ASSEMBLY)

4.	CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH (TRANSMISSION FLOOR SHIFT ASSEMBLY) - BODY GROUND)

(a) Disconnect the transmission control switch (transmission floor shift assembly) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
T23-2 (E) - Body ground	Always	Below 1 Ω

Text in Illustration

*a	Front view of wire harness connector (to Transmission Control Switch (Transmission Floor Shift Assembly))

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM)

(a) Disconnect the ECM connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
E19-17 (SFTU) - Body ground	Shift lever held in "+" (Up-shift)	Below 1 Ω
E19-27 (SFTD) - Body ground	Shift lever held in "-" (Down-shift)	Below 1 Ω
E19-17 (SFTU) - Body ground and other terminals	Shift lever not held in "+"	10 kΩ or higher
E19-27 (SFTD) - Body ground and other terminals	Shift lever not held in "-"	10 kΩ or higher

Text in Illustration

*a	Rear view of wire harness connector (to ECM)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	INSPECT TRANSMISSION CONTROL SWITCH (TRANSMISSION FLOOR SHIFT ASSEMBLY)

(a) Disconnect T23 transmission control switch (transmission floor shift assembly) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
4 (IG) - 5 (S)	Shift lever in S, "+" or "- "	Below 1 Ω
4 (IG) - 5 (S)	Shift lever not in S, "+" or "-"	10 kΩ or higher

Text in Illustration

*a	Component without harness connected (Transmission Control Switch (Transmission Floor Shift Assembly))

REPLACE TRANSMISSION CONTROL SWITCH (TRANSMISSION FLOOR SHIFT ASSEMBLY)

7.	CHECK HARNESS AND CONNECTOR (BATTERY - TRANSMISSION CONTROL SWITCH (TRANSMISSION FLOOR SHIFT ASSEMBLY))

(a) Disconnect the transmission control switch (transmission floor shift assembly) connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
T23-4 (IG) - Body ground	Ignition switch ON	11 to 14 V
T23-4 (IG) - Body ground	Ignition switch off	Below 1 V

Text in Illustration

*a	Front view of wire harness connector (to Transmission Control Switch (Transmission Floor Shift Assembly))

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH (TRANSMISSION FLOOR SHIFT ASSEMBLY) - ECM)

(a) Disconnect the T23 transmission control switch (transmission floor shift assembly) connector.

(b) Disconnect the E19 ECM connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
T23-5 (S) - E19-30 (S)	Always	Below 1 Ω
T23-5 (S) - Body ground	Always	10 kΩ or higher
E19-30 (S) - Body ground	Always	10 kΩ or higher

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE HARNESS OR CONNECTOR

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