2021 Toyota Sienna Hybrid Abnormal Brake Pedal Feel T-SB-0006-21

MG

Moderator
Please see T-SB-0006-21

Applicability YEAR:
2021 Toyota Sienna Hybrid

Introduction:
Some customers may notice an abnormal brake feel in their 2021 model year Sienna Hybrid vehicle that could be described as a longer than usual brake pedal stroke. This may occur when the engine is off for more than five minutes after entering the vehicle and closing all doors before driving. The condition does not affect braking performance and will improve as the system performs learning cycles during vehicle operation. However, once the engine is turned off and the brake ECU goes to sleep, these learned values will be reset and the abnormal brake pedal feel will return. Follow the Repair Procedure in this bulletin to address this condition.

Warranty Information:
Perform Zero Point Calibration

APPLICABLE WARRANTY:
This repair is covered under the Toyota Basic Warranty. This warranty is in effect for 36 months or 36,000 miles, whichever occurs first, from the vehicle’s in-service date.
Warranty application is limited to occurrence of the specified condition described in this bulletin.

Repair Procedure:
1. Confirm the condition exists.

A. Enter the vehicle and close ALL doors.
B. Ensure the engine remains OFF for AT LEAST five minutes.
C. Depress the brake pedal and turn the engine ON.
D. While depressing the brake pedal, put the vehicle in drive or reverse and start driving.
E. Does the brake pedal stroke feel longer than normal during the first 2 – 5 brake pedal applications and improve with each application?
YES — Continue to step 2.
NO — This bulletin does NOT apply. Continue diagnosis using the applicable Repair Manual.

2. Using Techstream, check for ANY DTCs. Are ANY DTCs stored related to brake application?
YES — This bulletin does NOT apply. Continue diagnosis using the applicable Repair Manual.
NO — Continue to step 3.

3. Perform a zero point calibration.

4. AFTER completing zero point calibration, repeat step 1 to verify proper vehicle operation and ensure the condition is no longer present.


 
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