Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: 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

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.

(c) Turn the Techstream 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 "-"

-

Result

Result

Proceed to

Data display is within Normal Condition range

A

Data display is not within Normal Condition range

B

B

GO TO STEP 6

A

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.

(c) Turn the Techstream 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)

-

Result

Result

Proceed to

Data display is within Normal Condition range

A

Data display is not within Normal Condition range

B

A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

B

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))

NG

REPLACE TRANSMISSION CONTROL SWITCH (TRANSMISSION FLOOR SHIFT ASSEMBLY)

OK

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))

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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)

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

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))

NG

REPLACE TRANSMISSION CONTROL SWITCH (TRANSMISSION FLOOR SHIFT ASSEMBLY)

OK

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))

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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.

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

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

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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