Canada - A/C - A/C Sensor Inspection
Bulletin
TSB2072
Issue Date
April 18, 2005
Title
SENSOR INSPECTION FOR AIR CONDITIONING SYSTEM
Component
HEATING & AIR CONDITIONING
Models
'90 - Current All Models
INTRODUCTION:
This service bulletin contains inspection procedures to more precisely confirm proper operation of the following temperature sensors of the air
conditioning system. Follow the procedures in this service bulletin when inspecting these sensors. These contents will be reflected in future repair
manuals.
- Room Temperature Sensor
- Ambient Temperature Sensor
- Air Duct Sensor
- Evaporator Temperature Sensor
- Solar Sensor
- Room Humidity Sensor
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APPLICABLE VEHICLES:
- All 1990 - Current model year Lexus vehicles.
WARRANTY INFORMATION:
INSPECTION PROCEDURE:
1. Inspect Room Temperature Sensor.
A. Measure the sensor resistance.
HINT:
As the temperature increases, the resistance decreases.
2. Inspect Ambient Temperature Sensor.
A. Measure sensor resistance according to the selected graph (specification).
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HINT:
As the temperature increases, the resistance decreases.
3. Inspect Air Duct Sensor.
A. Measure the sensor resistance according to the table and graph (specification).
NOTE:
- Even slightly touching the sensor may change the resistance value. Be sure to hold the connector of the sensor.
- When measuring, the sensor temperature must be the same as the ambient temperature.
HINT:
As the temperature increases, the resistance decreases.
4. Inspect Evaporator Temperature Sensor.
Select the appropriate graph (specification) using the following table.
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NOTE:
Please inspect the sensors for model years not indicated by this bulletin, according to the instructions in the applicable repair manual.
A. Measure the sensor resistance according to the selected graph (specification).
NOTE:
- Even slightly touching the sensor may change the resistance value.
- Be sure to hold the connector of the sensor.
- When measuring, the sensor temperature must be the same as the ambient temperature.
HINT:
As the temperature increases, the resistance decreases.
Graph 1:
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Graph 2:
Graph 3:
5. Inspect Solar Sensor.
Four types of solar sensors are used on Lexus vehicles depending on the vehicle specifications. The inspection procedure for each type of sensor
differs from the others. Select the appropriate inspection procedure from the table below according to vehicle specifications and perform the
inspection.
Procedure A:
a. Disconnect the solar sensor connector.
b. Measure the resistance between terminals 1 and 2 of the solar sensor under the following conditions:
- Cover the sensor with a cloth to avoid direct light.
- Expose the sensor to light from a distance of 300 mm (11.81 in.) or less with an inspection light.
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NOTE:
Terminal 1 of the sensor is always on the right, when the lock is facing up.
When using an analog tester, connect the positive (+) lead to terminal 2 and negative (-) lead to terminal 1 of the solar sensor.
HINT:
If the light is weak, the sensor may not react. Be sure to use an incandescent light for an inspection light.
Standard:
Procedure B:
a. Disconnect the solar sensor connector.
b. Measure the resistance between terminals 2 and 3 of the solar sensor under the following conditions:
- Cover the sensor with a cloth to avoid direct light.
- Expose the sensor to light from a distance of 300 mm (11.81 in.) or less with an inspection light.
NOTE:
When using an analog tester, connect the positive (+) lead to terminal 3 and negative (-) lead to terminal 2 of the solar sensor.
HINT:
If the light is weak, the sensor may not react. Be sure to use an incandescent light for an inspection light.
Standard:
Procedure C:
a. Turn the ignition switch ON.
b. Measure the voltage between terminals TSR (+) and CLTE (-) of the connector under the following conditions:
- Cover the sensor with a cloth to avoid direct light.
- Expose the sensor to light from a distance of 300 mm (11.81 in.) or less with an inspection light.
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HINT:
- If the light is weak, the sensor may not react. Be sure to use an incandescent light for an inspection light.
- Do not disconnect the solar sensor connector.
Standard:
c. Measure the voltage between terminals TSL (+) and CLTE (-) of the connector under the following conditions:
- Cover the sensor with a cloth to avoid direct light.
- Expose the sensor to light from a distance of 300 mm (11.81 in.) or less with an inspection light.
HINT:
- If the light is weak, the sensor may not react. Be sure to use an incandescent light for an inspection light.
- Do not disconnect the solar sensor connector.
Standard:
Procedure D:
a. Turn the ignition switch on.
b. Using the tester, measure the voltage between terminals TSD (+) and CLTE (-) of the connector under the following conditions:
- Cover the sensor with a cloth to avoid direct light.
- Expose the sensor to light from a distance of 300 mm (11.81 in.) or less with an inspection light.
HINT:
If the light is weak, the sensor may not react. Be sure to use an incandescent light for an inspection light.
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Standard:
6. Inspect Room Humidity Sensor.
Measure the humidity and output voltage of the humidity sensor when the sensor is installed on the vehicle and the temperature at the humidity
sensor position (room temperature sensor position) is 77锟斤拷F (25锟斤拷C). If the output voltage is within the specifications according to the graph and
table, the sensor is normal.
HINT:
For the inspection procedure of the room temperature sensor, refer to "Room Temperature Sensor Inspection Procedure" in this bulletin.
A. Turn the ignition switch to the ON position.
B. Measure the voltage between terminal VO (3) and GND (2) of the room humidity sensor.
C. Measure the humidity and voltage when the room temperature (humidity sensor position) is 77锟斤拷F (25锟斤拷C). According to the result, determine
whether the sensor is normal or not.
NOTE:
Issue of this Technical Service Bulletin is to ensure that proper repair information is available. IT DOES NOT CONSTITUTE AN
AUTHORIZATION FOR REPAIR. Normal provisions of the formal warranty policy, as applicable, will apply.Technical Service
Bulletin # CAN-TSB2064L Date: 050606
Canada - Engine Control - ECM Reprogramming Process
Bulletin
TSB2064
Issue Date
June 06, 2005
Title
2010 Lexus Truck RX 350 AWD V6-3.5L (2GR-FE) Page 213
ECU FLASH REPROGRAMMING PROCESS
Component
GENERAL INFORMATION
Models
Applicable Models
NOTICE:
This TSB supercedes TSB No. 0592 "How To Download TDT Software Versions and Calibration Files".
TSB No. 0592 should be discarded.
INTRODUCTION:
Electronic Control Unit (ECU) is a Lexus term used to describe integrated computerized devices responsible for managing the operation of a system
or sub-system. For the purposes of this bulletin, the term "ECU" is used as a generic label for the following SAE J1930 standard references:
- Powertrain Control Module (PCM)
- Engine Control Module (ECM)
- Transmission Control Module (TCM)
- or any other Lexus specific control unit
Flash reprogramming allows the ECU software to be updated for changes in vehicle calibrations without removing the ECU from the vehicle. Flash
calibration updates for specific vehicle models/ECUs will be released as field fix procedures described in individual service bulletins. This bulletin
details the ECU flash reprogramming process and the applications within ETAS and the Lexus Diagnostic Tester used for reprogramming.
Flash calibration updates can only be applied to the vehicle/ECU combination for which they are intended. ECUs have internal security that will not
allow them to be programmed with another ECU's information.
APPLICABLE VEHICLES:
- 2001 (and later) model year GS 430/300, IS 300, LS 430 & LX 470 vehicles.
- 2002 (and later) model year SC 430 vehicles.
- All 2003 (and later) model year Lexus vehicles.
PARTS INFORMATION:
WARRANTY INFORMATION:
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REQUIRED SSTs:
PROCESS OVERVIEW:
ECU Flash Reprogramming is a 4-step process:
1. Locate the desired calibration file on ETAS.
Calibration files are listed by model and model year.
2. Download the calibration file from ETAS to the Diagnostic Tester.
The Calibration Update Wizard (CUW) is an application on ETAS which downloads calibration files from ETAS to the Diagnostic Tester
Program Card. This step is only required when the calibration file is not currently stored on the Diagnostic Tester Program Card.
3. Reprogram the vehicle ECU with the Diagnostic Tester.
Diagnostic Tester Software now incorporates a function to update a vehicle's ECU calibration through flash reprogramming.
4. Confirm successful flash update and affix calibration update sticker.
Modifications to ECU calibration files must be recorded and properly displayed on the vehicle using the calibration update sticker.
NOTE:
The calibration file contains the Calibration ID number(s) for a specific vehicle ECU (see Figure 1).
NOTE:
The total number of Calibration ID numbers corresponds to the number of reprogrammable processors in the ECU (see Figure 2).
OPERATION PROCEDURE:
The following steps in this bulletin describe how to properly flash reprogram an ECU.
Locate Calibration File:
1. Locate calibration file on ETAS.
A. Click on Tools >Diagnostic Tester.
- Under the Diagnostic Tester on ETAS, a list of the latest calibration files will be displayed.
- Choose the appropriate model and model year calibration file.
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B. Proceed to step 2 for instructions on how to download the calibration file from ETAS to the Diagnostic Tester Program Card.
Download File To Tester:
2. Download the calibration file to the Diagnostic Tester.
The Calibration Update Wizard (CUW) is an application on ETAS which downloads calibration files from ETAS onto the Diagnostic Tester
Program Card.
NOTE:
Before you begin, ensure that the Diagnostic Tester is equipped with software version 10.2a, or later. Only a 12 MB program card (P/N
01002593-005) may be used for this process.
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A. Before downloading a new calibration file from ETAS, check the current calibration files stored on the Diagnostic Tester Program Card by
following the screen flow (Figure 4).
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B. You have the option to delete calibrations off the tester before downloading a new calibration. The CUW also provides this option if there is
not enough memory for the new calibration. To delete one or all of the calibrations, follow the screen flow (Figure 5).
C. If this is the first time you have downloaded a calibration file from ETAS to the Diagnostic Tester Program Card, you MUST first install the
latest version of the Calibration Update Wizard (CUW) onto your ETAS workstation PC, as shown.
This step is also required if you are using a version of CUW earlier than version 6.0. CUW 6.0 is the only version compatible with
Diagnostic Tester software version 10.2a and later. If necessary, see TSB0586 on ETAS to install or reinstall CUW.
D. The Calibration Update Wizard (CUW) launches automatically when a calibration file link is selected (or clicked).
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Verify that the CUW version is 6.0 or higher. If not, refer to the Note below. The CUW will guide you through the steps to download the
calibration file to the Diagnostic Tester Program Card. Click NEXT on the first screen (Figure 7).
NOTE
If the CUW does not launch, or the version is older than 6.0, install Diagnostic Software (ETAS Diagnostic Applications Installer). Specific
installation instructions (Reprogramming with CUW 6.0) are located under Diagnostics (Arrow) ECU Flash Reprogramming (Figure 6).
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E. Confirm the Diagnostic Tester has the appropriate software for the type of calibration file that was downloaded.
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F. Confirm the Diagnostic Tester software version and connections to the ETAS workstation are correct.
G. Place the Diagnostic Tester in the "GET CAL FROM PC" mode to receive the calibration file (Figure 10) Click NEXT on the ETAS
workstation. Once communications begin between the PC and the Diagnostic Tester, the Diagnostic Tester display will flash CONNECTED.
H. The CUW determines if there is enough memory to store the calibration file on the Diagnostic Tester Program Card. If there is insufficient
memory, the CUW will ask you to select the calibration file(s) to delete from the Diagnostic Tester Program Card to make room for the new
calibration file. If necessary, check the calibration file(s) to delete, as shown in Figure 11. Click DELETE.
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NOTE:
If there is adequate memory to store the calibration file, skip to Step J.
I. The CUW will now delete the calibration file(s) selected (see Figure 12).
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J. The top half of the CUW screen displays the calibrations currently stored on the Diagnostic Tester Program Card. The bottom half of the
screen displays the new calibration to be loaded onto the Diagnostic Tester Program Card (see Figure 13). Click NEXT to continue the
process.
K. Confirm the calibration file to be sent to the Diagnostic Tester Program Card (Figure 14). Click SEND.
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L. The calibration file will now be downloaded to the Diagnostic Tester Program Card. This process takes approximately 2-6 minutes (see
Figure 15).
M. The CUW will prompt when the calibration file is completely downloaded. Click OK to close the CUW (Figure 16).
The Diagnostic Tester now has the calibration file stored and you may proceed to the next step to reprogram the vehicle ECU.
Reprogramming ECU With Tester:
3. Reprogram the vehicle ECU with the Diagnostic Tester.
NOTICE:
Errors during the flash reprogramming process can permanently damage the vehicle ECU. Minimize the risks by following the steps below.
- Battery voltage MUST NOT FALL BELOW 11.4 volts during reprogramming.
- Confirm battery voltage is higher than 11.4 volts, but be sure voltage DOES NOT RISE ABOVE 16.0 volts during reprogramming.
- Turn off all electrical accessories (e.g. Audio system, A/C, interior lights, DRL, etc.).
- Do not add to or significantly change the vehicle's electrical load while reprogramming.
- Confirm the hood is open and ensure under hood temperatures do not exceed 158锟斤拷F.
- Confirm cable connections between the vehicle and Diagnostic Tester are secure. (Reference TSB0449, "ECU Flash Reprogramming
Error Message.")
- Do not disconnect or turn off the Diagnostic Tester or the vehicle ignition during reprogramming.
- Set the parking brake.
- Complete ALL flash calibration updates provided for each ECU.
If the battery's state of charge or capacity are in question, test with SST No. J-44350, "Midtronics Battery Tester."
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To ensure stable battery voltage, a battery charger may be connected during reprogramming if:
- Voltage does not fall below 11.4 volts.
- Voltage does not rise above 16.0 volts.
- Setting is on SLOW charge and not BOOST.
A. Connect the Diagnostic Tester to the vehicle and select CURRENT ECU CAL from the ECU REPROGRAM MAIN MENU. Determine the
vehicle's current ECU calibration. (See Figure 17.)
NOTE:
The vehicle may contain up to 3 separate calibration ID numbers. In the example shown, the vehicle ECU contains only 2 calibration IDs.
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Continue to update the ECU calibration file following the screen flow (Figure 18). Details for selected screens are shown in Figure 19.
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NOTE:
- Each flash calibration update will take approximately 15 to 45 minutes.
- Screens E through J (Figure 18) will need to be repeated for each flash calibration update (calibration ID number).
- All updates must display "YES" to complete the entire calibration file update for the vehicle ECU.
- Failure to complete all updates may result in PERMANENT ECU DAMAGE!
Confirm Update:
4. Confirm successful flash calibration update and affix calibration update sticker.
Follow these steps to confirm the calibration was reprogrammed to the ECU.
A. The new calibration file should be displayed as the current ECU calibration file.
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B. Using a permanent marker or ball point pen, enter the required information on the Authorized Modifications Label (Figures 21).
C. Affix this label under the hood in the location determined by the specific vehicle TSB or Campaign.
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