NHTSA ID Number: 10153265
Manufacturer Communication Number: T-TT-0520-19
TSB/Document Date: 2019-02-19
Summary
TT: In certain cases of leaking air conditioning systems, the root cause of the leak is inadvertently overlooked, causing a repeat repair. To improve customer satisfaction and repair A/C system leaks in one dealer visit, Toyota
has developed a set of guidelines for evaluating A/C system components.
Tech Tip T-TT-0520-19
January 04, 2019
Subject
Market
Air Conditioning System - Improved Component
Inspection
USA
Service Category
Section
Vehicle Interior
Heating/Air Conditioning
Applicability
Toyota
APPLICABLE VEHICLES
2015-2020
2015-2020
2016-2020
2019-2020
2015-2020
2015-2020
2018
2017-2020
2015-2020
2015-2020
2015-2018
2015-2020
2015
2015-2020
2015-2020
Highlander
Tundra
Mirai
Corolla Hatchback
Sequoia
Avalon
Mirai (Canada)
Prius Prime
Corolla
Avalon HV
Prius V
RAV4
Prius PHV
Prius C
Highlander HV
2015-2020
2015-2020
2015-2020
2015-2020
2016-2020
2015-2016
2015-2019
2017-2020
2015-2020
2020
2015-2020
2017-2018
2015-2020
2017-2020
2015-2020
Prius
Sienna
Land Cruiser
4Runner
RAV4 HV
Venza
Yaris
86
Camry
Corolla HV
Hilux
iM
Avanza
Yaris THAI-Prod
Camry HV
CONDITION
In certain cases of leaking air conditioning systems, the root cause of the leak is inadvertently
overlooked, causing a repeat repair. To improve customer satisfaction and repair A/C system leaks
in one dealer visit, Toyota has developed a set of guidelines for evaluating A/C system components.
Expires on
Ver. 2.9 01/01/2018 L
01/04/2020
© 2018, Toyota Motor Sales, USA
Page 1 of 7
Tech Tip T-TT-0520-19
January 04, 2019
Subject
Market
Air Conditioning System - Improved Component
Inspection
USA
Applicability
RECOMMENDATIONS
2) Inspect for O-ring Abnormality
• Remove the O-ring from pipe/component for
inspection.
• Using a plastic pick tool to remove O-ring
and prevent damage to mating part.
Use a non-metallic
tool for
O-ring removal.
Using a metallic
tool could result in
damage to other
components
OK Part* - Line at middle of O-ring is straight with
no deformation. No tears, or crushed areas.
*O-rings should be replaced anytime they are
removed from a pipe/component to prevent leaks
and foreign material.
Twisted O-Ring – No Good Part
Line at middle of O-ring is not straight.
Cut/Dent/Crush – No Good Part
O-ring damaged by another component.
Replace O-ring, proceed with A/C Pipe
Inspection.
Foreign Material– No Good Part
O-ring contaminated by material outside A/C
system.
Replace O-ring, proceed with A/C Pipe
inspection.
Step 2:
Inspect
O-Ring
Complete
Expires on
Ver. 2.9 01/01/2018 L
01/04/2020
Step 3:
Inspect
A/C Pipe
(Cont. to pg. 3)
© 2018, Toyota Motor Sales, USA
Page 2 of 7
Tech Tip T-TT-0520-19
January 04, 2019
Subject
Market
Air Conditioning System - Improved Component
Inspection
USA
Applicability
3) - Inspect for A/C Pipe Abnormality
OK Part - Light scratching parallel with O-ring
groove. This is caused by normal part
processing. Pipe is ok to reuse.
Damage – No Good Part
Pipe is damaged due to deep
scratching or gouge of base
metal. Pipe replacement is
recommended to prevent repeat
repair.
Foreign Material – OK Part
Pipe has foreign material stuck
to it. Material can be cleaned off
using a non-metallic tool and the
pipe is ok to be reused.
Corrosion – No Good Part
Pipe is damaged due to
corrosion of base material. Pipe
replacement is recommended to
prevent repeat repair.
Step 3:
Inspect
A/C Pipe
Complete
Expires on
Ver. 2.9 01/01/2018 L
01/04/2020
Step 4:
Inspect Mating
Components
(Cont. to pg. 4,5,6)
•
•
•
4a - Compressor Inspection – Pg.4
4b - Expansion Valve – Pg. 5
4c - Condenser Inspection – Pg.6
© 2018, Toyota Motor Sales, USA
Page 3 of 7
Tech Tip T-TT-0520-19
January 04, 2019
Subject
Market
Air Conditioning System - Improved Component
Inspection
USA
Applicability
4a) - Inspect for A/C Compressor Abnormality
OK Part - Light scratching parallel with O-ring groove.
This is caused by normal part processing. Compressor is
ok to reuse.
Damage – No Good Part
Compressor seal bore is damaged
due to deep scratching
perpendicular to O-ring groove.
Compressor replacement is
recommended to prevent repeat
repair.
Foreign Material – OK Part
Compressor has foreign material
stuck to seal bore.
Material can be carefully cleaned
off using a non-metallic tool and
the compressor is ok to be reused.
Expires on
Ver. 2.9 01/01/2018 L
01/04/2020
© 2018, Toyota Motor Sales, USA
Page 4 of 7
Tech Tip T-TT-0520-19
January 04, 2019
Subject
Market
Air Conditioning System - Improved Component
Inspection
USA
Applicability
4b) - Inspect for Expansion Valve Abnormality
OK Part - Light scratching parallel with O-ring
groove. This is caused by normal part processing.
Expansion valve is ok to reuse.
Damage – No Good Part
Expansion valve seal bore is
damaged due to deep scratching
perpendicular to O-ring groove.
Expansion valve replacement is
recommended to prevent repeat
repair.
Foreign Material – OK Part
Expansion Valve has foreign
material stuck to seal bore.
Material can be carefully cleaned
off using a non-metallic tool and
the expansion valve is ok to be
reused.
Expires on
Ver. 2.9 01/01/2018 L
01/04/2020
© 2018, Toyota Motor Sales, USA
Page 5 of 7
Tech Tip T-TT-0520-19
January 04, 2019
Subject
Market
Air Conditioning System - Improved Component
Inspection
USA
Applicability
4c) - Inspect for Condenser Abnormality
OK Part - Light scratching parallel with O-ring groove. This is
caused by normal part processing. Condenser is ok to reuse.
Damage – No Good Part
Condenser seal bore is damaged
due to deep scratching perpendicular
to O-ring groove.
Condenser replacement is
recommended to prevent repeat
repair.
Foreign Material – OK Part
Condenser has foreign material
stuck to seal bore.
Material can be carefully cleaned
off using a non-metallic tool and the
condenser is ok to be reused.
Corrosion – No Good Part
Seal bore is damaged due to
corrosion of base material.
Condenser replacement is
recommended to prevent repeat
repair.
Expires on
Ver. 2.9 01/01/2018 L
01/04/2020
© 2018, Toyota Motor Sales, USA
Page 6 of 7
Tech Tip T-TT-0520-19
January 04, 2019
Subject
Market
Air Conditioning System - Improved Component
Inspection
USA
Applicability
LINK REFERENCES
This Tech Tip does not contain any link references
Expires on
Ver. 2.9 01/01/2018 L
01/04/2020
© 2018, Toyota Motor Sales, USA
Page 7 of 7
Last update on 2026-06-23 / Affiliate links / Images from Amazon Product Advertising API
If the PDF is very large, it may not load in the preview below.
Some older TSBs had multiple PDFs — visit the NHTSA Website to view all PDFs.
If the TSB PDF does not show, download or view it on the NHTSA Website.
Click on the (+) Plus Sign
Then Click on Associated Document(s)
Search NHTSA Database for Recalls
Search NHTSA Database for Vehicle Investigations
View Latest Vehicle Investigations
Search NHTSA Database for Vehicle Complaints
View Latest Vehicle Complaints
TSB/Document ID: T-TT-0520-19
Replacement Service Bulletin Number:
MFR Communication Date: 2019-01-04
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: EQUIPMENT
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
- [Notice] When you receive a used device, it may be a customer return resold by Amazon without inspection. You can exchange it for a new one through Amazon. As this situation is unavoidable, we sincerely apologize. For any issues, contacting us via Amazon's "Messages" is the best way. THINKSCAN 689BT Bidirectional Scan Tool Can Be Used Immediately After It is Turned On, Without Complicated Registration Process, Which is More Convenient & Quick.
- Full Bi-Directional Control & 3000+ Active Tests: Take control and test components like actuators, fuel injectors, relays, and cooling fans in real time. You’ll quickly see if the problem is in the part itself or the control module — saving you hours of guesswork and frustrating trial-and-error.
- Advanced ECU Coding Capabilities: Handle module matching and hidden feature activation with confidence. When you replace an ECU or want to customize settings, this obd2 scanner diagnostic bi directional tool gives you the professional-level capabilities you need without the dealership price tag.
- 34+ Useful Reset and Maintenance Functions: Complete everyday service tasks smoothly with a wide range of helpful reset and maintenance functions. Whether you’re keeping up with regular upkeep or tackling a specific job, this scanner makes maintenance simpler and less stressful for both DIYers and pros.
- Comprehensive Full System Diagnostics: Diagnose every major system — Engine, Transmission, ABS
, SRS, TPMS, and more — all in one place. Finally stop wondering if you’re missing something important; get the full picture and clear codes with ease.
Last update on 2026-07-02 / Affiliate links / Images from Amazon Product Advertising API
- Top Reasons to Choose the D7S OBD2 Scanner: XTOOL D7S car scan tool, an upgrade of XTOOL D7, offers comprehensive features for automotive technicians, workshops, and DIY enthusiasts 1. Upgraded Hardware: 2+64GB memory, rear camera, intuitive interface, foldable bracket 2. Complete Diagnostics: FCA Autoauth, OE-level all system scan, 39+ maintenance services, 4K+ bidirectional, CANFD/DoIP protocol 3. Advanced Capabilities: ECU c0ding, PMI functions 4. Wide Compatibility: Support 10,000+ models, covering 99% vehicle brands 5. Multi-language: Available in 22+ languages, No IP Restrictions 6. 3-Year Updates: Save 300 bucks on software updates for the latest features and optimizations
- 2026 Upgraded D7S Car Scanner Features: The newly 2026 D7S V2.0 scanner for car brings exciting features for advanced vehicle diagnostics and enhanced user experience 1. FCA AutoAuth: Now supports FCA SGW module for Chrysler, for Jeep, for Dodge (2018+), for Fiat (2017+), enabling faster vehicle communication without gateway restrictions 2. PMI (Offline ECU Pr0gramming): Allows for Ford, for Lincoln, and for Mazda ECU pr0gramming for new modules 3. Optimized Diagnostic Report 2.0: Personalized reports with logos and customer info for auto shops. Note: Compatibility varies by cars, please check before order
- 39+ Services/Resets/Adaptations/Relearns/Calibrations: XTOOL D7S full system car scanner diagnostic tool tackles 99% of common car issues through its 36+ special functions, including Oil Reset, EPB, SAS, BMS, Throttle Reset, Injector C0ding, ABS Bleed, TPMS Reset, Power Balance, etc and also covers specific-vehicle functions like Crank Sensor Relearn, ABS Initialization, Cylinder Power Balance, Fuel Trim Reset, Idle Relearn etc. This car diagnostic scanner enhances efficiency, making repairs and maintenance hassle-free. Tip: DO NOT for All vehicles, please check compatibility first
- Cost-effective ECU C0ding Scan Tool for Specific Brands: Enhance your vehicle's performance with XTOOL D7S! This obd2 scanner all systems bidirectional offers advanced capabilities at an affordable price, supports online for BMW, for Benz and offline for BENZ, for MIT, along with PMI functions for Ford, for Mazda, and for Lincoln. Ideal for technicians and DIY enthusiasts, this automotive scanner diagnostic tool optimizes vehicle performance and enhances the driving experience. Note: Not for all cars and modules, please send car VIN to check the compatibility before purchase
- OE All System Diagnostic & 8 Pids Graphing: XTOOL D7S is a comprehensive all system bi directional obd2 scanner that delivers dealer-level diagnostics, completely controlling over your vehicle’s performance and health. This automotive scan tool can read and clear DTCs, view live data and ECU information, retrieve freeze frames, and perform active tests and full obd2 functions. This bi-directional scan tool can can identify your vehicle's make, model, and year information with just one click and show up to 8 PIDs live data with options for CSV viewing, playback, and recording for in-depth analysis. It is easy-to-use for both professionals and beginners, helping pinpoint issues efficiently
Last update on 2026-06-30 / Affiliate links / Images from Amazon Product Advertising API
- 【✅Compared to BOSSCOMM IF742, IF745 Offers Full-System Diagnostics】The BOSSCOMM IF745 car diagnostic scanner is an upgraded model of IF742. In addition to supporting all OBD2 Code Reader functions and 6 reset options (ABS/EPB/SAS/BMS/Oil/Throttle), it expands diagnostics from 4 systems (Check Engine/ABS/SRS/Transmission) to vehicle All systems, including Steering, Suspension, and Body Electronics. This provides deeper, more comprehensive diagnostic capabilities.
- 【✨10 OBD2 Functions】The BOSSCOMM IF745 scan tool’s DTC Lookup instantly translates fault codes into user-friendly explanations, its I/M Readiness feature streamlines emissions testing with a single tap, and Freeze Frame lets you pinpoint the exact moment of a fault for in-depth root-cause diagnosis. Combined with a live data dashboard and advanced diagnostics (O2S, OBMon, EVAP), it delivers comprehensive insights for confident troubleshooting.
- 【✨Deep Diagnostics for All Vehicle System Modules】Beyond code reading/clearing and ECU information retrieval, our all-in-one data stream feature lets you inspect all current fault codes and their locations across the vehicle’s systems. This vehicle code reader helps you turn off dashboard warning lights and perform a comprehensive self-check of your car at home—no more back-and-forth trips to the repair shop or hefty inspection fees.
- 【✨6 Essential Resets: ABS Bleeding, Oil, EPB, SAS, Throttle, BMS】The BOSSCOMM IF745 obd2 scanner diagnostic tool swiftly purges air from brake lines to restore braking sensitivity, fine-tunes maintenance cycles to eliminate false alerts, resolves parking brake issues with one-click control, recalibrates steering sensors for stability, optimizes engine idling/acceleration for smoother performance, and deeply resets battery systems to extend lifespan and range via precise parameter adjustments.❗NOTE: Does NOT support bidirectional control, coding, or programming.
- 【✨10,000+ Car Models, AutoVIN, 13 Languages】The BOSSCOMM IF745 vehicle scanner diagnostic tool covers 73+ global car brands and offers support in 13 languages, making it perfect for DIYers, auto mechanics, or as a thoughtful gift. With a single-click AutoVIN feature, it instantly retrieves vehicle serial numbers, streamlining diagnostics for users globally. This adaptable tool balances user-friendliness with precision, catering to both personal and professional requirements.✅Unsure about compatibility? Compatibility will vary on vehicles' model and year, pls reach us via 📧 [email protected] 📧 before purchase.
Last update on 2026-07-02 / Affiliate links / Images from Amazon Product Advertising API
This product presentation was made with AAWP plugin.