Problem Symptoms Table [11/2021 - ]
WARNING: This page is about a different car, the 2025 Lexus NX 350, 2024 Lexus NX 350, 2023 Lexus NX 350, and 2022 Lexus NX 350. However, it is still accessible from the selected car via links, so may be relevant.
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 operating the "+" or "-" paddle switch | Shift paddle switch circuit | Refer to Shift Paddle Switch Circuit [11/2021 - ] |
| ECM | Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [11/2021 - ] | |
| No change by drive mode switch | Drive mode select switch circuit | Refer to Drive Mode Select Switch Circuit [11/2021 - ] |
CHAPTER 2: ON-VEHICLE REPAIR AND OFF-VEHICLE REPAIR
| Symptom | Suspected Area | Link |
|---|---|---|
| Vehicle does not move with shift state in any forward position or reverse position | Shift control actuator assembly | Refer to REMOVAL [11/2021 - ] |
| Manual valve | Refer to DISASSEMBLY [11/2021 - ] | |
| Parking lock pawl | Refer to DISASSEMBLY [11/2021 - ] | |
| Rear planetary ring gear assembly | Refer to DISASSEMBLY [11/2021 - ] | |
| Torque converter assembly | Refer to INSPECTION [11/2021 - ] | |
| Vehicle does not move with shift state reverse (R) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| No. 3 clutch (C3) | Refer to DISASSEMBLY [11/2021 - ] | |
| No. 2 brake (B2) | Refer to DISASSEMBLY [11/2021 - ] | |
| No up-shift (1st to 2nd) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| Solenoid (SL5) valve | Refer to REMOVAL [11/2021 - ] | |
| Solenoid (SL6) valve | Refer to REMOVAL [11/2021 - ] | |
| No. 1 brake (B1) | Refer to DISASSEMBLY [11/2021 - ] | |
| No up-shift (2nd to 3rd) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| Solenoid (SL3) valve | Refer to REMOVAL [11/2021 - ] | |
| Solenoid (SL5) valve | Refer to REMOVAL [11/2021 - ] | |
| No. 3 clutch (C3) | Refer to DISASSEMBLY [11/2021 - ] | |
| No up-shift (3rd to 4th) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| Solenoid (SL3) valve | Refer to REMOVAL [11/2021 - ] | |
| Solenoid (SL4) valve | Refer to REMOVAL [11/2021 - ] | |
| No. 4 clutch (C4) | Refer to DISASSEMBLY [11/2021 - ] | |
| No up-shift (4th to 5th) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| Solenoid (SL2) valve | Refer to REMOVAL [11/2021 - ] | |
| Solenoid (SL4) valve | Refer to REMOVAL [11/2021 - ] | |
| No. 2 clutch (C2) | Refer to DISASSEMBLY [11/2021 - ] | |
| No up-shift (5th to 6th) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| Solenoid (SL1) valve | Refer to REMOVAL [11/2021 - ] | |
| Solenoid (SL4) valve | Refer to REMOVAL [11/2021 - ] | |
| No. 4 clutch (C4) | Refer to DISASSEMBLY [11/2021 - ] | |
| No up-shift (6th to 7th) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| Solenoid (SL3) valve | Refer to REMOVAL [11/2021 - ] | |
| Solenoid (SL4) valve | Refer to REMOVAL [11/2021 - ] | |
| No. 3 clutch (C3) | Refer to DISASSEMBLY [11/2021 - ] | |
| No up-shift (7th to 8th) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| Solenoid (SL3) valve | Refer to REMOVAL [11/2021 - ] | |
| Solenoid (SL5) valve | Refer to REMOVAL [11/2021 - ] | |
| No. 1 brake (B1) | Refer to DISASSEMBLY [11/2021 - ] | |
| No down-shift (8th to 7th) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| Solenoid (SL3) valve | Refer to REMOVAL [11/2021 - ] | |
| Solenoid (SL5) valve | Refer to REMOVAL [11/2021 - ] | |
| No. 3 clutch (C3) | Refer to DISASSEMBLY [11/2021 - ] | |
| No down-shift (7th to 6th) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| Solenoid (SL3) valve | Refer to REMOVAL [11/2021 - ] | |
| Solenoid (SL4) valve | Refer to REMOVAL [11/2021 - ] | |
| No. 4 clutch (C4) | Refer to DISASSEMBLY [11/2021 - ] | |
| No down-shift (6th to 5th) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| Solenoid (SL1) valve | Refer to REMOVAL [11/2021 - ] | |
| Solenoid (SL4) valve | Refer to REMOVAL [11/2021 - ] | |
| No. 1 clutch (C1) | Refer to DISASSEMBLY [11/2021 - ] | |
| No down-shift (5th to 4th) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| Solenoid (SL2) valve | Refer to REMOVAL [11/2021 - ] | |
| Solenoid (SL4) valve | Refer to REMOVAL [11/2021 - ] | |
| No. 4 clutch (C4) | Refer to DISASSEMBLY [11/2021 - ] | |
| No down-shift (4th to 3rd) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| Solenoid (SL3) valve | Refer to REMOVAL [11/2021 - ] | |
| Solenoid (SL4) valve | Refer to REMOVAL [11/2021 - ] | |
| No. 3 clutch (C3) | Refer to DISASSEMBLY [11/2021 - ] | |
| No down-shift (3rd to 2nd) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| Solenoid (SL3) valve | Refer to REMOVAL [11/2021 - ] | |
| Solenoid (SL5) valve | Refer to REMOVAL [11/2021 - ] | |
| No. 1 brake (B1) | Refer to DISASSEMBLY [11/2021 - ] | |
| No down-shift (2nd to 1st) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| Solenoid (SL5) valve | Refer to REMOVAL [11/2021 - ] | |
| Solenoid (SL6) valve | Refer to REMOVAL [11/2021 - ] | |
| No. 2 brake (B2) | Refer to DISASSEMBLY [11/2021 - ] | |
| No lock-up or no lock-up off | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| Torque converter assembly | Refer to INSPECTION [11/2021 - ] | |
| Harsh engagement (N to D) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| No. 1 clutch (C1) | Refer to DISASSEMBLY [11/2021 - ] | |
| No. 2 brake (B2) | Refer to DISASSEMBLY [11/2021 - ] | |
| Solenoid (SL1) valve | Refer to REMOVAL [11/2021 - ] | |
| Solenoid (SL6) valve | Refer to REMOVAL [11/2021 - ] | |
| Harsh engagement (N to R) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| Solenoid (SL3) valve | Refer to REMOVAL [11/2021 - ] | |
| Solenoid (SL6) valve | Refer to REMOVAL [11/2021 - ] | |
| No. 3 clutch (C3) | Refer to DISASSEMBLY [11/2021 - ] | |
| No. 2 brake (B2) | Refer to DISASSEMBLY [11/2021 - ] | |
| Harsh engagement (lock-up) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| Torque converter assembly | Refer to INSPECTION [11/2021 - ] | |
| Harsh engagement (1st to 2nd to 3rd to 4th to 5th to 6th to 7th to 8th) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| Harsh engagement (1st to 2nd) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| No. 1 brake (B1) | Refer to DISASSEMBLY [11/2021 - ] | |
| No. 2 brake (B2) | Refer to DISASSEMBLY [11/2021 - ] | |
| Harsh engagement (2nd to 3rd) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| No. 1 brake (B1) | Refer to DISASSEMBLY [11/2021 - ] | |
| No. 3 clutch (C3) | Refer to DISASSEMBLY [11/2021 - ] | |
| Harsh engagement (3rd to 4th) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| No. 3 clutch (C3) | Refer to DISASSEMBLY [11/2021 - ] | |
| No. 4 clutch (C4) | Refer to DISASSEMBLY [11/2021 - ] | |
| Harsh engagement (4th to 5th) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| No. 2 clutch (C2) | Refer to DISASSEMBLY [11/2021 - ] | |
| No. 4 clutch (C4) | Refer to DISASSEMBLY [11/2021 - ] | |
| Harsh engagement (5th to 6th) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| No. 1 clutch (C1) | Refer to DISASSEMBLY [11/2021 - ] | |
| No. 4 clutch (C4) | Refer to DISASSEMBLY [11/2021 - ] | |
| Harsh engagement (6th to 7th) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| No. 3 clutch (C3) | Refer to DISASSEMBLY [11/2021 - ] | |
| No. 4 clutch (C4) | Refer to DISASSEMBLY [11/2021 - ] | |
| Harsh engagement (7th to 8th) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| No. 1 brake (B1) | Refer to DISASSEMBLY [11/2021 - ] | |
| No. 3 clutch (C3) | Refer to DISASSEMBLY [11/2021 - ] | |
| Slip or shudder (shift state reverse (R)) | No. 3 clutch (C3) | Refer to DISASSEMBLY [11/2021 - ] |
| No. 2 brake (B2) | Refer to DISASSEMBLY [11/2021 - ] | |
| Torque converter assembly | Refer to INSPECTION [11/2021 - ] | |
| Slip or shudder (1st) | No. 1 clutch (C1) | Refer to DISASSEMBLY [11/2021 - ] |
| No. 2 brake (B2) | Refer to DISASSEMBLY [11/2021 - ] | |
| Torque converter assembly | Refer to INSPECTION [11/2021 - ] | |
| Slip or shudder (2nd) | No. 1 clutch (C1) | Refer to DISASSEMBLY [11/2021 - ] |
| No. 1 brake (B1) | Refer to DISASSEMBLY [11/2021 - ] | |
| Torque converter assembly | Refer to INSPECTION [11/2021 - ] | |
| Slip or shudder (3rd) | No. 1 clutch (C1) | Refer to DISASSEMBLY [11/2021 - ] |
| No. 3 clutch (C3) | Refer to DISASSEMBLY [11/2021 - ] | |
| Torque converter assembly | Refer to INSPECTION [11/2021 - ] | |
| Slip or shudder (4th) | No. 1 clutch (C1) | Refer to DISASSEMBLY [11/2021 - ] |
| No. 4 clutch (C4) | Refer to DISASSEMBLY [11/2021 - ] | |
| Torque converter assembly | Refer to INSPECTION [11/2021 - ] | |
| Slip or shudder (5th) | No. 1 clutch (C1) | Refer to DISASSEMBLY [11/2021 - ] |
| No. 2 clutch (C2) | Refer to DISASSEMBLY [11/2021 - ] | |
| Torque converter assembly | Refer to INSPECTION [11/2021 - ] | |
| Slip or shudder (6th) | No. 2 clutch (C2) | Refer to DISASSEMBLY [11/2021 - ] |
| No. 4 clutch (C4) | Refer to DISASSEMBLY [11/2021 - ] | |
| Torque converter assembly | Refer to INSPECTION [11/2021 - ] | |
| Slip or shudder (7th) | No. 2 clutch (C2) | Refer to DISASSEMBLY [11/2021 - ] |
| No. 3 clutch (C3) | Refer to DISASSEMBLY [11/2021 - ] | |
| Torque converter assembly | Refer to INSPECTION [11/2021 - ] | |
| Slip or shudder (8th) | No. 2 clutch (C2) | Refer to DISASSEMBLY [11/2021 - ] |
| No. 1 brake (B1) | Refer to DISASSEMBLY [11/2021 - ] | |
| Torque converter assembly | Refer to INSPECTION [11/2021 - ] | |
| No engine braking (1st) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| No. 1 clutch (C1) | Refer to DISASSEMBLY [11/2021 - ] | |
| No. 2 brake (B2) | Refer to DISASSEMBLY [11/2021 - ] | |
| No engine braking (2nd) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| No. 1 clutch (C1) | Refer to DISASSEMBLY [11/2021 - ] | |
| No. 1 brake (B1) | Refer to DISASSEMBLY [11/2021 - ] | |
| No engine braking (3rd) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| No. 1 clutch (C1) | Refer to DISASSEMBLY [11/2021 - ] | |
| No. 3 clutch (C3) | Refer to DISASSEMBLY [11/2021 - ] | |
| No engine braking (4th) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| No. 1 clutch (C1) | Refer to DISASSEMBLY [11/2021 - ] | |
| No. 4 clutch (C4) | Refer to DISASSEMBLY [11/2021 - ] | |
| No engine braking (5th) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| No. 1 clutch (C1) | Refer to DISASSEMBLY [11/2021 - ] | |
| No. 2 clutch (C2) | Refer to DISASSEMBLY [11/2021 - ] | |
| No engine braking (6th) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| No. 2 clutch (C2) | Refer to DISASSEMBLY [11/2021 - ] | |
| No. 4 clutch (C4) | Refer to DISASSEMBLY [11/2021 - ] | |
| No kick-down | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| Shift point too high or too low | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| Poor acceleration (all positions) | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| Torque converter assembly | Refer to INSPECTION [11/2021 - ] | |
| Engine stalls when starting off or stopping. | Transmission valve body assembly | Refer to REMOVAL [11/2021 - ] |
| Torque converter assembly | Refer to INSPECTION [11/2021 - ] |