Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000ZQ6C
Model Year Start: 2017 Model: Sienna Prod Date Range: [08/2016 -           ]
Title: UA80E (AUTOMATIC TRANSMISSION / TRANSAXLE): TORQUE CONVERTER AND DRIVE PLATE: INSPECTION; 2017 - 2020 MY Sienna [08/2016 -        ]

INSPECTION

PROCEDURE

1. INSPECT TORQUE CONVERTER ASSEMBLY

(a) Inspect the one-way clutch. Press on the splines of the stator with a finger and rotate it. Check that it rotates smoothly when turned clockwise and rotates with difficulty when turned counterclockwise.

Difficult

Smooth

If necessary, clean the torque converter assembly and recheck the one-way clutch. Replace the torque converter assembly if the one-way clutch still fails the inspection.

(b) Inspect the torque converter assembly.

If any of the following problems are present, replace the torque converter assembly.

Malfunction:

  • A metallic sound is emitted from the torque converter assembly during the stall test or when the shift lever is moved to N.
  • The one-way clutch turns smoothly or difficulty in both directions.
  • The amount of powder in the ATF is more than the sample shown in the illustration (refer to the sample).

HINT:

The sample shows approximately 0.025 liters (0.026 US qts, 0.022 Imp. qts) of ATF in a Petri dish, which has been taken from the removed torque converter assembly.

*a

Sample showing maximum allowable amount of powder in ATF

*b

Full Scale

(c) Replace the ATF in the torque converter assembly.

HINT:

If the ATF is discolored or has a foul odor, stir the ATF in the torque converter assembly and drain it before replacing the ATF.

(d) Prevent deformation of the torque converter assembly and damage to the oil pump gear.

NOTICE:

Make sure that all of the bolts are the same length and that the specified bolts are used.

HINT:

If there is any damage to the tip of a bolt for the torque converter assembly or to the bottom of a bolt hole, replace the bolt and torque converter assembly.

*a

Correct

*b

Incorrect

*c

Bottom is damaged

2. INSPECT DRIVE PLATE AND RING GEAR SUB-ASSEMBLY

(a) Check the drive plate and ring gear sub-assembly for damage.

Measurement Point

(b) Set up a dial indicator and measure the runout at the 6 areas on the drive plate and ring gear sub-assembly surface that contact the torque converter clutch assembly.

Maximum Runout:

0.30 mm (0.0118 in.)

HINT:

  • If the runout is more than the maximum or the drive plate and ring gear sub-assembly is damaged, replace the drive plate and ring gear sub-assembly.
  • If installing a new drive plate and ring gear sub-assembly, confirm that the spacers are oriented properly before tightening the bolts.

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