Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Problem Symptoms Table

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Drivetrain / Ua80e Automatic Transmission / Transaxle / Automatic Transaxle System / 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.
*1: When there is a malfunction in this circuit, a DTC may be stored.
*2: w/ Shift Paddle Switch

Chapter 1: Electronic Circuit Matrix Chart

Symptom	Suspected Area	Link
No up-shift (1st to 2nd)	Solenoid (SL5) valve circuit*1
	Solenoid (SL6) valve circuit*1
	ECM
No up-shift (2nd to 3rd)	Solenoid (SL3) valve circuit*1
	Solenoid (SL5) valve circuit*1
	ECM
No up-shift (3rd to 4th)	Solenoid (SL3) valve circuit*1
	Solenoid (SL4) valve circuit*1
	ECM
No up-shift (4th to 5th)	Solenoid (SL2) valve circuit*1
	Solenoid (SL4) valve circuit*1
	ECM
No up-shift (5th to 6th)	Solenoid (SL1) valve circuit*1
	Solenoid (SL4) valve circuit*1
	ECM
No up-shift (6th to 7th)	Solenoid (SL3) valve circuit*1
	Solenoid (SL4) valve circuit*1
	ECM
No up-shift (7th to 8th)	Solenoid (SL3) valve circuit*1
	Solenoid (SL5) valve circuit*1
	ECM
No down-shift (8th to 7th)	Solenoid (SL3) valve circuit*1
	Solenoid (SL5) valve circuit*1
	ECM
No down-shift (7th to 6th)	Solenoid (SL3) valve circuit*1
	Solenoid (SL4) valve circuit*1
	ECM
No down-shift (6th to 5th)	Solenoid (SL1) valve circuit*1
	Solenoid (SL4) valve circuit*1
	ECM
No down-shift (5th to 4th)	Solenoid (SL2) valve circuit*1
	Solenoid (SL4) valve circuit*1
	ECM
No down-shift (4th to 3rd)	Solenoid (SL3) valve circuit*1
	Solenoid (SL4) valve circuit*1
	ECM
No down-shift (3rd to 2nd)	Solenoid (SL3) valve circuit*1
	Solenoid (SL5) valve circuit*1
	ECM
No down-shift (2nd to 1st)	Solenoid (SL5) valve circuit*1
	Solenoid (SL6) valve circuit*1
	ECM
No lock-up or no lock-up off	Solenoid (SLU) valve circuit*1
	Solenoid (SL) valve circuit*1
	Transmission revolution sensor (NT) circuit*1
	Stop light switch circuit*1
	ECM
No lock-up	Solenoid (SLU) valve circuit*1
	Solenoid (SL) valve circuit*1
	Transmission revolution sensor (NT) circuit*1
	Stop light switch circuit*1
	Engine coolant temperature sensor circuit*1
	ECM
No lock-up off	Solenoid (SLU) valve circuit*1
	Solenoid (SL) valve circuit*1
	ECM
Shift point too high or too low	Solenoid (SLT) valve circuit*1
	Transmission revolution sensor (NT) circuit*1
	Transmission revolution sensor (NC) circuit*1
	ATF temperature sensor circuit*1
	Throttle position sensor circuit*1
	ECM
No gear change by moving shift lever to "+" or "-" while in S	Transmission control switch circuit
	ECM
No gear change by operating the "+" or "-" paddle switch*2	Shift paddle switch circuit
No gear change by operating the "+" or "-" paddle switch*2	ECM
No change by drive mode switch	Drive mode select switch circuit
Harsh engagement (N to D)	Solenoid (SL1) valve circuit*1
	Solenoid (SL6) valve circuit*1
	Solenoid (SLT) valve circuit*1
	Transmission revolution sensor (NT) circuit*1
	ECM
Harsh engagement (N to R)	Solenoid (SL3) valve circuit*1
	Solenoid (SL6) valve circuit*1
	Solenoid (SLT) valve circuit*1
	Transmission revolution sensor (NT) circuit*1
	ECM
Harsh engagement (lock-up)	Solenoid (SLU) valve circuit*1
	Transmission revolution sensor (NT) circuit*1
	Transmission revolution sensor (NC) circuit*1
	ECM
Harsh engagement (any driving position)	Accelerator pedal position sensor circuit*1
	Solenoid (SLT) valve circuit*1
	Transmission revolution sensor (NT) circuit*1
	Transmission revolution sensor (NC) circuit*1
	ATF temperature sensor circuit*1
	ECM
Poor acceleration	Solenoid (SLT) valve circuit*1
Poor acceleration	ECM
No engine braking	ECM
No kick-down	ECM
Engine stalls when starting off or stopping.	Solenoid (SLU) valve circuit*1
	Solenoid (SL) valve circuit*1
	ECM
Shifting malfunction	Park/neutral position switch circuit*1
	Transmission control switch circuit
	Shift paddle switch circuit*2
	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
	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
No lock-up or no lock-up off	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
Harsh engagement (lock-up)	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
Poor acceleration (all positions)	Torque converter assembly
Engine stalls when starting off or stopping.	Transmission valve body assembly
Engine stalls when starting off or stopping.	Torque converter assembly

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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Problem Symptoms Table

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