Toyota Tundra 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.

Shifting to "+" once raises the shift range by one, and shifting to "-" once lowers the shift range by one.

WIRING DIAGRAM

PROCEDURE

1.

INSPECT TRANSMISSION CONTROL SWITCH

(a) for Column Shift Type:

(1) Disconnect the J25 transmission control switch connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

6 (IG) - 13 (S)

Shift lever in S, "+" or "-"

Below 1 Ω

5 (SFTU) - 11 (E)

Shift lever held in "+"

(Up-shift)

Below 1 Ω

4 (SFTD) - 11 (E)

Shift lever held in "-"

(Down-shift)

Below 1 Ω

6 (IG) - 13 (S)

Shift lever not in S, "+" or "-"

10 kΩ or higher

5 (SFTU) - 11 (E)

Shift lever in S

10 kΩ or higher

4 (SFTD) - 11 (E)

Shift lever in S

10 kΩ or higher

Text in Illustration

*a

Component without harness connected

(Transmission Control Switch)

(b) for Floor Shift Type:

(1) Disconnect the J24 transmission control switch connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 (IG) - 7 (S)

Shift lever in S, "+" or "-"

Below 1 Ω

2 (SFTU) - 5 (E)

Shift lever held in "+"

(Up-shift)

Below 1 Ω

1 (SFTD) - 5 (E)

Shift lever held in "-"

(Down-shift)

Below 1 Ω

3 (IG) - 7 (S)

Shift lever not in S, "+" or "-"

10 kΩ or higher

2 (SFTU) - 5 (E)

Shift lever in S

10 kΩ or higher

1 (SFTD) - 5 (E)

Shift lever in S

10 kΩ or higher

Text in Illustration

*a

Component without harness connected

(Transmission Control Switch)

Result

Result

Proceed to

OK

A

NG (for Column Shift Type)

B

NG (for Floor Shift Type)

C

B

REPLACE TRANSMISSION CONTROL SWITCH (COLUMN SHIFT SHIFT LEVER SUB-ASSEMBLY)

C

REPLACE TRANSMISSION CONTROL SWITCH (TRANSMISSION FLOOR SHIFT ASSEMBLY)

A

2.

CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - BATTERY, BODY GROUND)

(a) for Column Shift Type:

(1) Disconnect the J25 transmission control switch connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

J25-6 (IG) - Body ground

Ignition switch ON

11 to 14 V

J25-6 (IG) - Body ground

Ignition switch off

Below 1 V

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J25-11 (E) - Body ground

Always

Below 1 Ω

Text in Illustration

*a

Front view of wire harness connector

(to Transmission Control Switch)

(b) for Floor Shift Type:

(1) Disconnect the J24 transmission control switch connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

J24-3 (IG) - Body ground

Ignition switch ON

11 to 14 V

J24-3 (IG) - Body ground

Ignition switch off

Below 1 V

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J24-5 (E) - Body ground

Always

Below 1 Ω

Text in Illustration

*a

Front view of wire harness connector

(to Transmission Control Switch)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM)

(a) Disconnect the A24 ECM connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A24-25 (S) - Body ground

  • Ignition switch ON
  • Shift lever in S, "+" or "-"

11 to 14 V

A24-25 (S) - Body ground

  • Ignition switch ON
  • Shift lever not in S, "+" or "-"

Below 1 V

(c) Turn the ignition switch off.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A24-38 (SFTU) - Body ground

Shift lever held in "+"

(Up-shift)

Below 1 Ω

A24-27 (SFTD) - Body ground

Shift lever held in "-"

(Down-shift)

Below 1 Ω

A24-38 (SFTU) - Body ground

Shift lever in S

10 kΩ or higher

A24-27 (SFTD) - Body ground

Shift lever in S

10 kΩ or higher

Text in Illustration

*a

Front 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

    Terminals Of Ecm

    Vehicle Control History

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