NHTSA ID Number: 10177574
Manufacturer Communication Number: L-TT-0288-20
TSB/Document Date: 2020-07-27
Summary
TT: The Lexus
Quality group is looking to better understand our customers expectation regarding vehicle drivability. Specifically, we are looking at vehicle surge/hesitation condition (inconsistent acceleration) and would like to recover detailed customer voice and vehicle data.
Tech Tip L-TT-0288-20
Subject
June 01, 2020
Market
Vehicle Drivability Complaint Questionnaire
Service Category
Section
Engine/Hybrid System
Engine Control
USA
Applicability
RX, ES, GX, LS, UX, IS
APPLICABLE VEHICLES
2018-2021
2019-2021
2018-2021
2018-2021
IS350
UX200
GX460
ES350
2018-2021
2019-2021
2018-2021
LS500
IS300
RX350
CONDITION
The Lexus Quality group is looking to better understand our customers expectation regarding vehicle
drivability. Specifically, we are looking at vehicle surge/hesitation condition (inconsistent acceleration)
and would like to recover detailed customer voice and vehicle data. Refer to below surge/hesitation
graph.
If you have a customer with this type of concern, and no other fault with the vehicle has been found,
follow the instructions below.
If you are unclear if the customer is experiencing a surge condition, continue to follow the instructions
below.
RECOMMENDATIONS
Collect the following information and then contact TAS.
Dealer Provided:
Vehicle information
Vehicle grade (Base, F-Sport)
Mileage
Tire condition
- Brand
- Size (e.g. 195/65 R15 91H)
- Tread depth, equal tread depth
- Air pressure when customer arrives at the dealer
Aftermarket products (lift kit, wheels, non-OEM tires)
Current EFI/ECT software/calibration number
Expires on
Ver. 3.1 01/01/2020 L
06/01/2021
© 2020, Lexus, a Division of Toyota Motor Sales, USA
Page 1 of 4
Tech Tip L-TT-0288-20
June 01, 2020
Subject
Market
Vehicle Drivability Complaint Questionnaire
USA
Applicability
RX, ES, GX, LS, UX, IS
RECOMMENDATIONS
Evaluation/duplication drive (If you cannot duplicate, request this information from the customer):
Road information where customer has the compliant (Street Name, location, smoothness, when
traveling uphill or downhill, etc.)
Elevation of testing area
Weather condition of test (ambient air temp, rain, etc.)
AC status (on/off, temperature, defroster, etc.)
Customer Provided Information
See questionnaire below and have the customer fill out (Questionnaire can also be found under
“Customer Interview Forms” on Service Lane --> Knowledge Center)
Data Recording:
During drive with the customer, take a vehicle snapshot using Techstream to capture only the
following datalist parameters.
PID Values
Vehicle speed
Engine speed
Calculated load
Mass air flow Sensor
Atmospheric pressure
Coolant temperature
A/T oil temperature No.1
Intake air temperature
Ambient air temperature
Engine run time
IG-On coolant temperature
IG-On intake air temperature
Battery voltage
Units
MPH
RPM
%
gm/sec
psi
°F
°F
°F
°F
sec
°F
°F
V
Accelerator position
Open side malfunction
Throttle request position
Throttle sensor position
Throttle position command
Throttle position sensor open position No.1
Output axis speed
NT sensor speed
Shift SW status (P, R, N, S, D range)
Drive mode status
Power mode SW
Lock up status
Shift status
Actual engine percent torque
%
On/Off
V
%
V
V
rpm
rpm
On/Off
Normal
On/Off
On/Off
1-6
%
Mark (Flag) each instance of the customer compliant.
- For technician drive only (do NOT have customer perform) – during condition duplication, select
neutral gear position and see if the drivability condition changes in any way. Note change if
any. This will help determine if it is drivetrain or vehicle side related.
Once all items are complete (vehicle data, customer questionnaire, Techstream data) please create a
TAS case and attach all documents. If it is a weekend or holiday, continue with diagnosis and
repair. Please save all parts and/or details and contact TAS on the next available work day.
Expires on
Ver. 3.1 01/01/2020 L
06/01/2021
© 2020, Lexus, a Division of Toyota Motor Sales, USA
Page 2 of 4
Tech Tip L-TT-0288-20
June 01, 2020
Subject
Market
Vehicle Drivability Complaint Questionnaire
USA
Applicability
RX, ES, GX, LS, UX, IS
RECOMMENDATIONS
Vehicle Drivability – Customer Questionnaire
1. Fuel
- Octane (is same octane used all the time?) ______________________________________
o If different octane is used, does the affect vehicle derivability? _________________
o Are different brands of fuel used? ________________________________________
o Does this affect/change drivability? _______________________________________
o If yes to either, in what way(s)? __________________________________________
o Please provide most commonly used brand of fuel ___________________________
2. Drive mode (D-range, Eco, S-Sport, manual shifting of automatic transmission)
-
What drive mode is used when issue is felt? ____________________________________
o Does condition change or not occur if another drive mode is used? _____________
o If so, what drive mode was used? _______________________________________
o In what way(s) does the condition change? ________________________________
3. Occurrence
- When does the condition occur after startup? (immediately, after x minutes, startup has no
affect)
_________________________________________________________________________
-
How long does this occurrence last? (short single instance, couple seconds, etc.)
_________________________________________________________________________
-
Speed when condition occurs? _______________________________________________
-
Is speed steady, accelerating or decelerating? _________________________________
Expires on
Ver. 3.1 01/01/2020 L
06/01/2021
© 2020, Lexus, a Division of Toyota Motor Sales, USA
Page 3 of 4
Tech Tip L-TT-0288-20
June 01, 2020
Subject
Market
Vehicle Drivability Complaint Questionnaire
USA
Applicability
RX, ES, GX, LS, UX, IS
LINK REFERENCES
This Tech Tip does not contain any link references
Expires on
Ver. 3.1 01/01/2020 L
06/01/2021
© 2020, Lexus, a Division of Toyota Motor Sales, USA
Page 4 of 4
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TSB/Document ID: L-TT-0288-20
Replacement Service Bulletin Number:
MFR Communication Date: 2020-06-01
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
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