Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Problem Symptoms Table
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.
- *: When there is a malfunction in this circuit, a DTC may be stored.
| Symptom | Suspected Area | Link |
|---|---|---|
| No up-shift (1st to 2nd) | Shift solenoid valve SL5 circuit* | |
| ECM | | |
| No up-shift (2nd to 3rd) | Shift solenoid valve SL3 circuit* | |
| Shift solenoid valve SL5 circuit* | | |
| ECM | | |
| No up-shift (3rd to 4th) | Shift solenoid valve SL3 circuit* | |
| Shift solenoid valve SL4 circuit* | | |
| ECM | | |
| No up-shift (4th to 5th) | Shift solenoid valve SL2 circuit* | |
| Shift solenoid valve SL4 circuit* | | |
| ECM | | |
| No up-shift (5th to 6th) | Shift solenoid valve SL1 circuit* | |
| Shift solenoid valve SL4 circuit* | | |
| ECM | | |
| No up-shift (6th to 7th) | Shift solenoid valve SL3 circuit* | |
| Shift solenoid valve SL4 circuit* | | |
| ECM | | |
| No up-shift (7th to 8th) | Shift solenoid valve SL3 circuit* | |
| Shift solenoid valve SL5 circuit* | | |
| ECM | | |
| No down-shift (8th to 7th) | Shift solenoid valve SL3 circuit* | |
| Shift solenoid valve SL5 circuit* | | |
| ECM | | |
| No down-shift (7th to 6th) | Shift solenoid valve SL3 circuit* | |
| Shift solenoid valve SL4 circuit* | | |
| ECM | | |
| No down-shift (6th to 5th) | Shift solenoid valve SL1 circuit* | |
| Shift solenoid valve SL4 circuit* | | |
| ECM | | |
| No down-shift (5th to 4th) | Shift solenoid valve SL2 circuit* | |
| Shift solenoid valve SL4 circuit* | | |
| ECM | | |
| No down-shift (4th to 3rd) | Shift solenoid valve SL3 circuit* | |
| Shift solenoid valve SL4 circuit* | | |
| Shift solenoid valve S1 circuit* | | |
| ECM | | |
| No down-shift (3rd to 2nd) | Shift solenoid valve SL3 circuit* | |
| Shift solenoid valve SL5 circuit* | | |
| ECM | | |
| No down-shift (2nd to 1st) | Shift solenoid valve SL5 circuit* | |
| ECM | | |
| No lock-up or no lock-up off | Shift solenoid valve SLU circuit* | |
| Transmission revolution sensor (NT) circuit* | | |
| Stop light switch circuit* | | |
| ECM | | |
| No lock-up | Shift solenoid valve SLU circuit* | |
| Transmission revolution sensor (NT) circuit* | | |
| Stop light switch circuit* | | |
| Engine coolant temperature sensor circuit* | | |
| ECM | | |
| No lock-up off | Shift solenoid valve SLU circuit* | |
| ECM | | |
| Shift point too high or too low | Shift solenoid valve SLT circuit* | |
| Transmission revolution sensor (NT) circuit* | | |
| Transmission revolution sensor (NC) circuit* | | |
| ATF temperature sensor circuit* | | |
| Throttle position sensor circuit* | | |
| Pattern select switch sport mode circuit | | |
| ECM | | |
| No gear change by moving shift lever to "+" or "-" while in M | Transmission control switch circuit | |
| Shift paddle switch circuit | | |
| ECM | | |
| No gear change by operating the "+" or "-" shift paddle switch | Shift paddle switch circuit | |
| Transmission control switch circuit | | |
| ECM | | |
| Harsh engagement (N to D) | Shift solenoid valve SL1 circuit* | |
| Shift solenoid valve SLT circuit* | | |
| Transmission revolution sensor (NT) circuit* | | |
| ECM | | |
| Harsh engagement (N to R) | Shift solenoid valve SL3 circuit* | |
| Shift solenoid valve S1 circuit* | | |
| Shift solenoid valve SLT circuit* | | |
| Shift solenoid valve S2 circuit* | | |
| ECM | | |
| Harsh engagement (lock-up) | Shift solenoid valve SLU circuit* | |
| Transmission revolution sensor (NT) circuit* | | |
| Transmission revolution sensor (NC) circuit* | | |
| ECM | | |
| Harsh engagement (any driving position) | Shift solenoid valve SL1 circuit* | |
| Shift solenoid valve SL2 circuit* | | |
| Shift solenoid valve SL3 circuit* | | |
| Shift solenoid valve SL4 circuit* | | |
| Shift solenoid valve SL5 circuit* | | |
| Shift solenoid valve S1 circuit* | | |
| Shift solenoid valve SLT circuit* | | |
| Shift solenoid valve SLU circuit* | | |
| Transmission revolution sensor (NT) circuit* | | |
| Engine coolant temperature sensor circuit* | | |
| ECM | | |
| Poor acceleration | Shift solenoid valve SLT circuit* | |
| ECM | | |
| No engine braking | ECM | |
| No kick-down | ECM | |
| Engine stalls when starting off or stopping | Shift solenoid valve SLU circuit* | |
| ECM | | |
| Shifting malfunction | Park/neutral position switch assembly circuit* | |
| Transmission control switch circuit | | |
| ECM | |
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| 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 | |
| Shift solenoid valve SL5 | | |
| No. 1 brake (B1) | | |
| No up-shift (2nd to 3rd) | Transmission valve body assembly | |
| Shift solenoid valve SL3 | | |
| Shift solenoid valve SL5 | | |
| No. 3 clutch (C3) | | |
| No up-shift (3rd to 4th) | Transmission valve body assembly | |
| Shift solenoid valve SL3 | | |
| Shift solenoid valve SL4 | | |
| No. 4 clutch (C4) | | |
| No up-shift (4th to 5th) | Transmission valve body assembly | |
| Shift solenoid valve SL2 | | |
| Shift solenoid valve SL4 | | |
| No. 2 clutch (C2) | | |
| No up-shift (5th to 6th) | Transmission valve body assembly | |
| Shift solenoid valve SL1 | | |
| Shift solenoid valve SL4 | | |
| No. 4 clutch (C4) | | |
| No up-shift (6th to 7th) | Transmission valve body assembly | |
| Shift solenoid valve SL3 | | |
| Shift solenoid valve SL4 | | |
| No. 3 clutch (C3) | | |
| No up-shift (7th to 8th) | Transmission valve body assembly | |
| Shift solenoid valve SL3 | | |
| Shift solenoid valve SL5 | | |
| No. 1 brake (B1) | | |
| No down-shift (8th to 7th) | Transmission valve body assembly | |
| Shift solenoid valve SL3 | | |
| Shift solenoid valve SL5 | | |
| No. 3 clutch (C3) | | |
| No down-shift (7th to 6th) | Transmission valve body assembly | |
| Shift solenoid valve SL3 | | |
| Shift solenoid valve SL5 | | |
| No. 4 clutch (C4) | | |
| No down-shift (6th to 5th) | Transmission valve body assembly | |
| Shift solenoid valve SL1 | | |
| Shift solenoid valve SL4 | | |
| No. 1 clutch (C1) | | |
| No down-shift (5th to 4th) | Transmission valve body assembly | |
| Shift solenoid valve SL2 | | |
| Shift solenoid valve SL4 | | |
| No. 4 clutch (C4) | | |
| No down-shift (4th to 3rd) | Transmission valve body assembly | |
| Shift solenoid valve SL3 | | |
| Shift solenoid valve SL4 | | |
| Shift solenoid valve S1 | | |
| No. 3 clutch (C3) | | |
| No down-shift (3rd to 2nd) | Transmission valve body assembly | |
| Shift solenoid valve SL3 | | |
| Shift solenoid valve SL5 | | |
| No. 1 brake (B1) | | |
| No down-shift (2nd to 1st) | Transmission valve body assembly | |
| Shift solenoid valve SL5 | | |
| No. 1 one-way clutch (F1) | | |
| 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) | | |
| Shift solenoid valve SL1 | | |
| No. 1 one-way clutch (F1) | | |
| Harsh engagement (N to R) | Transmission valve body assembly | |
| No. 3 clutch (C3) | | |
| No. 2 brake (B2) | | |
| No. 1 one-way clutch (F1) | | |
| 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 clutch (C1) | | |
| No. 1 brake (B1) | | |
| No. 1 one-way clutch (F1) | | |
| Harsh engagement (2nd to 3rd) | Transmission valve body assembly | |
| No. 1 clutch (C1) | | |
| No. 3 clutch (C3) | | |
| No. 1 one-way clutch (F1) | | |
| Harsh engagement (3rd to 4th) | Transmission valve body assembly | |
| No. 1 clutch (C1) | | |
| No. 4 clutch (C4) | | |
| No. 1 one-way clutch (F1) | | |
| Harsh engagement (4th to 5th) | Transmission valve body assembly | |
| No. 1 clutch (C1) | | |
| No. 2 clutch (C2) | | |
| No. 1 one-way clutch (F1) | | |
| Harsh engagement (5th to 6th) | Transmission valve body assembly | |
| No. 2 clutch (C2) | | |
| No. 4 clutch (C4) | | |
| No. 1 one-way clutch (F1) | | |
| Harsh engagement (6th to 7th) | Transmission valve body assembly | |
| No. 2 clutch (C2) | | |
| No. 3 clutch (C3) | | |
| No. 1 one-way clutch (F1) | | |
| Harsh engagement (7th to 8th) | Transmission valve body assembly | |
| No. 2 clutch (C2) | | |
| No. 1 brake (B1) | | |
| No. 1 one-way clutch (F1) | | |
| 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. 1 one-way clutch (F1) | | |
| 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 | |
Monitor Drive Pattern
MONITOR DRIVE PATTERN MONITOR DRIVE PATTERN FOR ECT CAUTION: Perform the following procedure on a level surface while strictly observing all traffic laws and speed limits. HINT: Performing this drive ...
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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