Last Modified: 12-11-2024 6.11:8.1.0 Doc ID: RM100000002OT6S
Model Year Start: 2025 Model: GR Corolla Prod Date Range: [09/2024 -           ]
Title: UC80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: Transmission Control Switch Circuit; 2025 MY Corolla Corolla Hatchback GR Corolla [09/2024 -        ]

Transmission Control Switch Circuit

DESCRIPTION

When the shift lever is in M and moved toward "-" or "+", it is possible to select different shift ranges (M1 to M8).

Moving the shift lever toward "+" increases the shift range by one, and moving the shift lever toward "-" decreases the shift range by one.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.

READ VALUE USING GTS (Shift SW Status (S Range))

(a) Read the Data List according to the display on the GTS.

Powertrain > Engine > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Shift SW Status (S Range)

Sport (M) mode select switch status

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

-

Powertrain > Engine > Data List

Tester Display

Shift SW Status (S Range)

Result

Proceed to

Data List value is normal

A

Data List value is not normal

B
B

GO TO STEP 6

A

2.

READ VALUE USING GTS (SPORT SHIFT UP SW AND SPORT SHIFT DOWN SW)

(a) Read the Data List according to the display on the GTS.

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

Proceed to

Data List values are normal

A

Data List values are not normal

B
A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

B

3.

INSPECT TRANSMISSION CONTROL SWITCH (SHIFT LOCK CONTROL UNIT ASSEMBLY)

(a) Disconnect the I16 transmission control switch connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (SFTU) - 2 (E)

Shift lever held in "+" (Up shift)

Below 1 Ω

Shift lever not held in "+" (Up shift)

10 kΩ or higher

3 (SFTD) - 2 (E)

Shift lever held in "-" (Down shift)

Below 1 Ω

Shift lever not held in "-" (Down shift)

10 kΩ or higher

*a

Component without harness connected

(Transmission Control Switch (Shift Lock Control Unit Assembly))
NG

REPLACE TRANSMISSION CONTROL SWITCH (SHIFT LOCK CONTROL UNIT ASSEMBLY)

OK

4.

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

(a) Disconnect the I16 transmission control switch connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I16-2 (E) - Body ground

Always

Below 1 Ω
NG

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

5.

CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM)

(a) Connect the I16 transmission control switch connector.

(b) Disconnect the A139 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A139-44 (SFTU) - Body ground

Shift lever held in "+" (Up shift)

Below 1 Ω

A139-44 (SFTU) - Body ground

Shift lever not held in "+" (Up shift)

10 kΩ or higher

A139-52 (SFTD) - Body ground

Shift lever held in "-" (Down shift)

Below 1 Ω

A139-52 (SFTD) - Body ground

Shift lever not held in "-" (Down shift)

10 kΩ or higher
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

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

6.

INSPECT TRANSMISSION CONTROL SWITCH (SHIFT LOCK CONTROL UNIT ASSEMBLY)

(a) Disconnect the I16 transmission control switch connector.

*a

Component without harness connected

(Transmission Control Switch (Shift Lock Control Unit Assembly))

(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 M, "+" or "-"

Below 1 Ω

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

10 kΩ or higher
NG

REPLACE TRANSMISSION CONTROL SWITCH (SHIFT LOCK CONTROL UNIT ASSEMBLY)

OK

7.

CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH (POWER SOURCE))

(a) Disconnect the I16 transmission control switch connector.

*a

Front view of wire harness connector

(to Shift Lock Control Unit Assembly (Transmission Control Switch))

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

I16-4 (IG) - Body ground

Ignition switch ON

11 to 14 V
NG

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

8.

CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM)

(a) Disconnect the I16 transmission control switch connector.

(b) Disconnect the A139 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I16-5 (S) - A139-4 (S)

Always

Below 1 Ω

I16-5 (S) or A139-4 (S) - Body ground and other terminals

Always

10 kΩ or higher
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

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