| Last Modified: 12-11-2024 | 6.11:8.1.0 | Doc ID: RM100000002OT6M |
| Model Year Start: 2025 | Model: GR Corolla | Prod Date Range: [09/2024 - ] |
| Title: UC80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: PROBLEM SYMPTOMS TABLE; 2025 MY Corolla Corolla Hatchback GR Corolla [09/2024 - ] | ||
PROBLEM SYMPTOMS TABLE
HINT:
- Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
- The Matrix Chart is divided into 2 chapters. When troubleshooting, check Chapter 1 first. If instructions are given in Chapter 1 to proceed to 2, proceed as instructed.
- If the instruction "Proceed to Next Suspected Area Shown in Problem Symptoms Table" is given in the flowchart for each circuit, proceed to the next suspected area in the table.
- If the problem still occurs even though there are no malfunctions in any of the circuits, check the ECM and replace it if necessary.
Chapter 1: Electronic Circuit Matrix Chart
|
Symptom |
Suspected Area |
Link |
|---|---|---|
|
No gear change by moving shift lever to "+" or "-" while in M |
Transmission control switch circuit |
|
|
ECM |
|
|
|
No gear change by operating the "+" or "-" paddle switch |
Shift paddle switch circuit |
|
|
ECM |
|
|
|
No change by drive mode switch |
Drive mode select switch circuit |
|
![2025 MY Corolla Corolla Hatchback GR Corolla [09/2024 - ]; UC80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: Transmission Control Switch Circuit](/t3Portal/stylegraphics/info.gif)
Chapter 2: On-vehicle Repair and Off-vehicle Repair
|
Symptom |
Suspected Area |
Link |
|---|---|---|
|
Vehicle does not move with shift lever in any forward position or reverse position |
Transmission control cable |
|
|
Manual valve |
|
|
|
Parking lock pawl |
|
|
|
Rear planetary ring gear assembly |
|
|
|
Torque converter assembly |
|
|
|
Vehicle does not move with shift lever in R |
Transmission valve body assembly |
|
|
No. 3 clutch (C3) |
|
|
|
No. 2 brake (B2) |
|
|
|
No up-shift (1st to 2nd) |
Transmission valve body assembly |
|
|
Solenoid (SL5) valve |
|
|
|
Solenoid (SL6) valve |
|
|
|
No. 1 brake (B1) |
|
|
|
No up-shift (2nd to 3rd) |
Transmission valve body assembly |
|
|
Solenoid (SL3) valve |
|
|
|
Solenoid (SL5) valve |
|
|
|
No. 3 clutch (C3) |
|
|
|
No up-shift (3rd to 4th) |
Transmission valve body assembly |
|
|
Solenoid (SL3) valve |
|
|
|
Solenoid (SL4) valve |
|
|
|
No. 4 clutch (C4) |
|
|
|
No up-shift (4th to 5th) |
Transmission valve body assembly |
|
|
Solenoid (SL2) valve |
|
|
|
Solenoid (SL4) valve |
|
|
|
No. 2 clutch (C2) |
|
|
|
No up-shift (5th to 6th) |
Transmission valve body assembly |
|
|
Solenoid (SL1) valve |
|
|
|
Solenoid (SL4) valve |
|
|
|
No. 4 clutch (C4) |
|
|
|
No up-shift (6th to 7th) |
Transmission valve body assembly |
|
|
Solenoid (SL3) valve |
|
|
|
Solenoid (SL4) valve |
|
|
|
No. 3 clutch (C3) |
|
|
|
No up-shift (7th to 8th) |
Transmission valve body assembly |
|
|
Solenoid (SL3) valve |
|
|
|
Solenoid (SL5) valve |
|
|
|
No. 1 brake (B1) |
|
|
|
No down-shift (8th to 7th) |
Transmission valve body assembly |
|
|
Solenoid (SL3) valve |
|
|
|
Solenoid (SL5) valve |
|
|
|
No. 3 clutch (C3) |
|
|
|
No down-shift (7th to 6th) |
Transmission valve body assembly |
|
|
Solenoid (SL3) valve |
|
|
|
Solenoid (SL4) valve |
|
|
|
No. 4 clutch (C4) |
|
|
|
No down-shift (6th to 5th) |
Transmission valve body assembly |
|
|
Solenoid (SL1) valve |
|
|
|
Solenoid (SL4) valve |
|
|
|
No. 1 clutch (C1) |
|
|
|
No down-shift (5th to 4th) |
Transmission valve body assembly |
|
|
Solenoid (SL2) valve |
|
|
|
Solenoid (SL4) valve |
|
|
|
No. 4 clutch (C4) |
|
|
|
No down-shift (4th to 3rd) |
Transmission valve body assembly |
|
|
Solenoid (SL3) valve |
|
|
|
Solenoid (SL4) valve |
|
|
|
No. 3 clutch (C3) |
|
|
|
No down-shift (3rd to 2nd) |
Transmission valve body assembly |
|
|
Solenoid (SL3) valve |
|
|
|
Solenoid (SL5) valve |
|
|
|
No. 1 brake (B1) |
|
|
|
No down-shift (2nd to 1st) |
Transmission valve body assembly |
|
|
Solenoid (SL5) valve |
|
|
|
Solenoid (SL6) valve |
|
|
|
No. 2 brake (B2) |
|
|
|
No lock-up or no lock-up off |
Transmission valve body assembly |
|
|
Torque converter assembly |
|
|
|
Harsh engagement (N to D) |
Transmission valve body assembly |
|
|
No. 1 clutch (C1) |
|
|
|
No. 2 brake (B2) |
|
|
|
Solenoid (SL1) valve |
|
|
|
Solenoid (SL6) valve |
|
|
|
Harsh engagement (N to R) |
Transmission valve body assembly |
|
|
Solenoid (SL3) valve |
|
|
|
Solenoid (SL6) valve |
|
|
|
No. 3 clutch (C3) |
|
|
|
No. 2 brake (B2) |
|
|
|
Harsh engagement (lock-up) |
Transmission valve body assembly |
|
|
Torque converter assembly |
|
|
|
Harsh engagement (1st to 2nd to 3rd to 4th to 5th to 6th to 7th to 8th) |
Transmission valve body assembly |
|
|
Harsh engagement (1st to 2nd) |
Transmission valve body assembly |
|
|
No. 1 brake (B1) |
|
|
|
No. 2 brake (B2) |
|
|
|
Harsh engagement (2nd to 3rd) |
Transmission valve body assembly |
|
|
No. 1 brake (B1) |
|
|
|
No. 3 clutch (C3) |
|
|
|
Harsh engagement (3rd to 4th) |
Transmission valve body assembly |
|
|
No. 3 clutch (C3) |
|
|
|
No. 4 clutch (C4) |
|
|
|
Harsh engagement (4th to 5th) |
Transmission valve body assembly |
|
|
No. 2 clutch (C2) |
|
|
|
No. 4 clutch (C4) |
|
|
|
Harsh engagement (5th to 6th) |
Transmission valve body assembly |
|
|
No. 1 clutch (C1) |
|
|
|
No. 4 clutch (C4) |
|
|
|
Harsh engagement (6th to 7th) |
Transmission valve body assembly |
|
|
No. 3 clutch (C3) |
|
|
|
No. 4 clutch (C4) |
|
|
|
Harsh engagement (7th to 8th) |
Transmission valve body assembly |
|
|
No. 1 brake (B1) |
|
|
|
No. 3 clutch (C3) |
|
|
|
Slip or shudder (shift lever in R) |
No. 3 clutch (C3) |
|
|
No. 2 brake (B2) |
|
|
|
Torque converter assembly |
|
|
|
Slip or shudder (1st) |
No. 1 clutch (C1) |
|
|
No. 2 brake (B2) |
|
|
|
Torque converter assembly |
|
|
|
Slip or shudder (2nd) |
No. 1 clutch (C1) |
|
|
No. 1 brake (B1) |
|
|
|
Torque converter assembly |
|
|
|
Slip or shudder (3rd) |
No. 1 clutch (C1) |
|
|
No. 3 clutch (C3) |
|
|
|
Torque converter assembly |
|
|
|
Slip or shudder (4th) |
No. 1 clutch (C1) |
|
|
No. 4 clutch (C4) |
|
|
|
Torque converter assembly |
|
|
|
Slip or shudder (5th) |
No. 1 clutch (C1) |
|
|
No. 2 clutch (C2) |
|
|
|
Torque converter assembly |
|
|
|
Slip or shudder (6th) |
No. 2 clutch (C2) |
|
|
No. 4 clutch (C4) |
|
|
|
Torque converter assembly |
|
|
|
Slip or shudder (7th) |
No. 2 clutch (C2) |
|
|
No. 3 clutch (C3) |
|
|
|
Torque converter assembly |
|
|
|
Slip or shudder (8th) |
No. 2 clutch (C2) |
|
|
No. 1 brake (B1) |
|
|
|
Torque converter assembly |
|
|
|
No engine braking (1st) |
Transmission valve body assembly |
|
|
No. 1 clutch (C1) |
|
|
|
No. 2 brake (B2) |
|
|
|
No engine braking (2nd) |
Transmission valve body assembly |
|
|
No. 1 clutch (C1) |
|
|
|
No. 1 brake (B1) |
|
|
|
No engine braking (3rd) |
Transmission valve body assembly |
|
|
No. 1 clutch (C1) |
|
|
|
No. 3 clutch (C3) |
|
|
|
No engine braking (4th) |
Transmission valve body assembly |
|
|
No. 1 clutch (C1) |
|
|
|
No. 4 clutch (C4) |
|
|
|
No engine braking (5th) |
Transmission valve body assembly |
|
|
No. 1 clutch (C1) |
|
|
|
No. 2 clutch (C2) |
|
|
|
No engine braking (6th) |
Transmission valve body assembly |
|
|
No. 2 clutch (C2) |
|
|
|
No. 4 clutch (C4) |
|
|
|
No kick-down |
Transmission valve body assembly |
|
|
Shift point too high or too low |
Transmission valve body assembly |
|
|
Poor acceleration (all positions) |
Transmission valve body assembly |
|
|
Torque converter assembly |
|
|
|
Engine stalls when starting off or stopping. |
Transmission valve body assembly |
|
|
Torque converter assembly |
|
|
|