Lexus RX (RX 350L, RX450h) 2016-2022 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.
Chapter 1: Electronic Circuit Matrix Chart

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

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

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

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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

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