Last Modified: 08-22-2025 6.11:8.1.0 Doc ID: RM0000003TPCFW9
Model Year Start: 2026 Model: GR Corolla Prod Date Range: [08/2025 -           ]
Title: UC80F (AUTOMATIC TRANSMISSION / TRANSAXLE): TRANSMISSION WIRE: REMOVAL; 2026 MY Corolla Corolla Hatchback GR Corolla [08/2025 -        ]

REMOVAL

CAUTION / NOTICE / HINT

The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during transmission wire removal/installation are shown below.

Necessary Procedures After Parts Removed/Installed/Replaced

Replaced Part or Performed Procedure

Necessary Procedure

Effect/Inoperative Function when Necessary Procedure not Performed

Link

Replacement of automatic transaxle fluid

ATF thermal degradation estimate reset

The value of the Data List item "ATF Thermal Degradation Estimate" is not estimated correctly

2025 - 2026 MY Corolla Corolla Hatchback GR Corolla [09/2024 -        ]; UC80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: INITIALIZATION

PROCEDURE

1. REMOVE TRANSMISSION OIL COOLER

Click here 2025 - 2026 MY Corolla Corolla Hatchback GR Corolla [09/2024 -        ]; UC80F (AUTOMATIC TRANSMISSION / TRANSAXLE): OIL COOLER: REMOVAL

2. REMOVE NO. 4 INLET AIR CLEANER

Click here 2026 MY Corolla Corolla Hatchback Corolla HV GR Corolla [08/2025 -        ]; EXTERIOR PANELS / TRIM: FRONT BUMPER (for Hatchback, GR): REMOVAL+

3. REMOVE RADIATOR SUPPORT OPENING COVER

Click here 2026 MY Corolla Corolla Hatchback Corolla HV GR Corolla [08/2025 -        ]; EXTERIOR PANELS / TRIM: FRONT BUMPER (for Hatchback, GR): REMOVAL+

4. REMOVE INLET NO. 1 AIR CLEANER

Click here 2026 MY GR Corolla [08/2025 -        ]; G16E-GTS (EMISSION CONTROL): MONOLITHIC CONVERTER: REMOVAL+

5. REMOVE AIR CLEANER WITH AIR CLEANER HOSE

Click here 2026 MY GR Corolla [08/2025 -        ]; G16E-GTS (EMISSION CONTROL): MONOLITHIC CONVERTER: REMOVAL+

6. REMOVE NO. 5 AIR CLEANER INLET

Click here 2026 MY GR Corolla [08/2025 -        ]; G16E-GTS (ENGINE MECHANICAL): ENGINE ASSEMBLY: REMOVAL+

7. REMOVE AIR CLEANER BRACKET

Click here 2026 MY GR Corolla [08/2025 -        ]; G16E-GTS (ENGINE MECHANICAL): ENGINE ASSEMBLY: REMOVAL+

8. DISCONNECT RADIATOR HOSE ASSEMBLY (w/ Sub Radiator)

(a) Slide the clip and disconnect the radiator hose assembly from the water outlet.

9. DISCONNECT NO. 1 SUB-RADIATOR HOSE (w/ Sub Radiator)

(a) Slide the clip and disconnect the No. 1 sub-radiator hose from the radiator hose assembly.

10. REMOVE RADIATOR HOSE ASSEMBLY (w/ Sub Radiator)

(a) Slide the clip and remove the radiator hose assembly from the radiator assembly.

11. REMOVE NO. 1 RADIATOR HOSE (w/o Sub Radiator)

(a) Slide the clip and disconnect the No. 1 radiator hose from the water outlet.

(b) Slide the clip and remove the No. 1 radiator hose from the radiator assembly.

12. REMOVE NO. 2 AIR TUBE

Click here 2026 MY GR Corolla [08/2025 -        ]; G16E-GTS (ENGINE MECHANICAL): ENGINE ASSEMBLY: REMOVAL+

13. REMOVE NO. 4 AIR HOSE

(a) Loosen the hose clamp and remove the No. 4 air hose from the intercooler assembly.

14. REMOVE NO. 5 AIR HOSE

Click here 2026 MY GR Corolla [08/2025 -        ]; G16E-GTS (ENGINE MECHANICAL): ENGINE ASSEMBLY: REMOVAL+

15. SEPARATE ENGINE WIRE

(a) Disengage the 2 clamps to separate the engine wire from the 2 wire harness clamp brackets.

(b) Disengage the clamp to separate the No. 4 water by-pass hose from the engine wire.

(c) Remove the bolt to separate the engine wire from the transaxle housing.

16. REMOVE WIRE HARNESS CLAMP BRACKET

(a) Remove the bolt and wire harness clamp bracket from the transmission case side cover.

17. SEPARATE NO. 1 OIL COOLER TUBE SUB-ASSEMBLY

(a) Remove the bolt to separate the No. 1 oil cooler tube sub-assembly from the oil cooler union sub-assembly.

HINT:

Use a container to catch any automatic transaxle fluid which flows out.

18. REMOVE OUTLET NO. 1 OIL COOLER HOSE

(a) Slide the clip and remove the outlet No. 1 oil cooler hose from the oil cooler union sub-assembly.

HINT:

Use a container to catch any automatic transaxle fluid which flows out.

19. DISCONNECT NO. 1 TRANSMISSION OIL COOLER HOSE ASSEMBLY

(a) Slide the clip and disconnect the No. 1 transmission oil cooler hose assembly from the oil cooler union sub-assembly.

HINT:

Use a container to catch any automatic transaxle fluid which flows out.

20. REMOVE OIL COOLER UNION SUB-ASSEMBLY

(a) Remove the bolt to separate the oil cooler union sub-assembly bracket portion from the automatic transaxle case sub-assembly.

*1

Oil Cooler Union Bolt

(b) Remove the 2 oil cooler union bolts and 4 gaskets to remove the oil cooler union sub-assembly from the automatic transaxle case sub-assembly.

21. REMOVE TRANSMISSION CASE SIDE COVER

(a) Remove the 10 bolts and transmission case side cover from the automatic transaxle case sub-assembly.

22. REMOVE TRANSMISSION WIRE

(a) Disengage the claw, rotate the lever and disconnect the transmission wire connector.

(b) Disengage the clamp to disconnect the transmission wire from the solenoid lock plate.

*a

Connector (A)

*b

Connector (B)

(c) Disconnect the 9 solenoid valve connectors.

HINT:

  • Using a screwdriver, disconnect the solenoid valve connector (A) using the procedure shown in the illustration.
  • Using a screwdriver, disconnect the solenoid valve connector (B) using the procedure shown in the illustration.

(d) Remove the bolt and temperature sensor clamp and disconnect the temperature sensor from the transmission valve body assembly.

(e) Disconnect the transmission revolution sensor (NT) connector and transmission revolution sensor (NC) connector.

(f) Remove the bolt and transmission wire from the automatic transaxle case sub-assembly.