Transmission Control Switch Circuit [06/2017 - 10/2020]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine / Data List / Shift SW Status (S Range).
5. Read the Data List according to the display on the Techstream.

   Powertrain > Engine > Data List 

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

   Powertrain > Engine > Data List 

   Tester Display
   Shift SW Status (S Range)

   Result

   Result	Proceed to
   Data List value is normal	A
   Data List value is not normal	B

Result: 

B 

See step  6

Result: 

A 

See step  2

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine / Data List / Sport Shift Up SW and Sport Shift Down SW.
5. Read the Data List according to the display on the Techstream.

   Powertrain > Engine > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Sport Shift Up SW	Sport shift up switch status	ON or OFF	ON: Shift lever held in "+" or "+" shift paddle switch operated OFF: Shift lever not held in "+" and "+" shift paddle switch released	-
   Sport Shift Down SW	Sport shift down switch status	ON or OFF	ON: Shift lever held in "-" or "-" shift paddle switch operated OFF: Shift lever not held in "-" and "-" shift paddle switch released	-

   Powertrain > Engine > Data List 

   Tester Display
   Sport Shift Up SW
   Sport Shift Down SW

   Result

   Result	Proceed to
   Data List values are normal	A
   Data List values are not normal	B

Result: 

A 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [06/2017 - ] 

Result: 

B 

See step  3

1. Disconnect the K29 transmission control switch connector.
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE TRANSMISSION CONTROL SWITCH (SHIFT LOCK CONTROL UNIT ASSEMBLY). Refer to  COMPONENTS [06/2017 - ] 

Result: 

OK 

See step  4

1. Disconnect the K29 transmission control switch connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K29-2 (E) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION CONTROL SWITCH - BODY GROUND) 

Result: 

OK 

See step  5

1. Connect the K29 transmission control switch connector.
2. Disconnect the A21 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A21-38 (SFTU) - Body ground	Shift lever held in "+" (Up shift)	Below 1 Ω
   A21-38 (SFTU) - Body ground	Shift lever not held in "+" (Up shift)	10 kΩ or higher
   A21-37 (SFTD) - Body ground	Shift lever held in "-" (Down shift)	Below 1 Ω
   A21-37 (SFTD) - Body ground	Shift lever not held in "-" (Down shift)	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [06/2017 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM) 

1. Disconnect the K29 transmission control switch connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

2. 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
   	Shift lever not in S, "+" or "-"	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE TRANSMISSION CONTROL SWITCH (SHIFT LOCK CONTROL UNIT ASSEMBLY). Refer to  COMPONENTS [06/2017 - ] 

Result: 

OK 

See step  7

1. Disconnect the K29 transmission control switch connector.
2. Turn the engine switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   K29-4 (IG) - Body ground	Engine switch on (IG)	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION CONTROL SWITCH (POWER SOURCE)) 

Result: 

OK 

See step  8

1. Disconnect the K29 transmission control switch connector.
2. Disconnect the A21 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K29-5 (S) - A21-17 (S)	Always	Below 1 Ω
   K29-5 (S) or A21-17 (S) - Body ground and other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [06/2017 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM)