| Last Modified: 08-21-2023 | 6.11:8.1.0 | Doc ID: RM100000001YNYQ |
| Model Year Start: 2022 | Model: Avalon HV | Prod Date Range: [08/2021 - ] |
| Title: PRE-COLLISION: PRE-COLLISION SYSTEM: U023A87; Lost Communication with Image Processing Module "A" Missing Message; 2022 MY Avalon Avalon HV [08/2021 - ] | ||
|
DTC |
U023A87 |
Lost Communication with Image Processing Module "A" Missing Message |
DESCRIPTION
for HV Model:
-
The forward recognition camera communicates with the skid control ECU (brake booster with master cylinder assembly) via CAN communication.
If a communication error is detected between the skid control ECU (brake booster with master cylinder assembly) and forward recognition camera, the forward recognition camera stores this DTC.
for Gasoline Model:
-
The forward recognition camera communicates with the skid control ECU (brake actuator assembly) via CAN communication.
If a communication error is detected between the skid control ECU (brake actuator assembly) and forward recognition camera, the forward recognition camera stores this DTC.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
|
U023A87 |
Lost Communication with Image Processing Module "A" Missing Message |
for HV Model:
for Gasoline Model:
|
|
CAUTION / NOTICE / HINT
NOTICE:
- When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
-
When the forward recognition camera is replaced with a new one or the windshield glass is replaced or removed/installed, make sure to read Before Starting Adjustment, then perform optical axis alignment for the forward recognition camera and clear the vehicle control history for each system.
HINT:
Forward recognition camera axis alignment can be performed by using either One Time Recognition, Sequential Recognition or Driving Adjustment.
One Time Recognition: Click here
![2022 MY Avalon Avalon HV [08/2021 - ]; CRUISE CONTROL: FRONT CAMERA: TARGET ADJUSTMENT(ONE TIME RECOGNITION)](/t3Portal/stylegraphics/info.gif)
Sequential Recognition: Click here
Driving Adjustment: Click here
PROCEDURE
|
1. |
CONFIRM MODEL |
(a) Choose the model to be inspected.
|
Result |
Proceed to |
|---|---|
|
for HV Model |
A |
|
for Gasoline Model |
B |
| B |
|
|
|
2. |
CHECK FOR DTCs (ABS/VSC/TRAC/EPB) |
(a) Using the Techstream, check for electronically controlled brake system DTCs.
Chassis > ABS/VSC/TRAC/EPB > Trouble Codes
HINT:
If DTC U023A87 and electronically controlled brake system DTCs are output, perform troubleshooting for the electronically controlled brake system first.
|
Result |
Proceed to |
|---|---|
|
Electronically controlled brake system DTCs are not output |
A |
|
Electronically controlled brake system DTCs are output |
B |
| B |
|
|
|
3. |
PERFORM TEST MODE (ELECTRONICALLY CONTROLLED BRAKE SYSTEM) |
HINT:
When entering Test Mode, the skid control ECU (brake booster with master cylinder assembly) communicates with the forward recognition camera to judge whether the vehicle is equipped with the pre-collision system. Therefore, do not exit Test Mode within 5 seconds of entering Test Mode.
(a) Procedure to enter Test Mode
(1) Turn the ignition switch off.
(2) Check that the steering wheel is centered.
(3) Check that the shift lever is in P.
(4) Connect the Techstream to the DLC3.
(5) Turn the ignition switch ON.
(6) Turn the Techstream on.
(7) Switch the skid control ECU (brake booster with master cylinder assembly) to Test Mode using the Techstream. Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Utility / Signal Check.
Chassis > ABS/VSC/TRAC/EPB > Utility
|
Tester Display |
|---|
|
Signal Check |
HINT:
Do not exit Test Mode within 5 seconds of entering Test Mode. If Test Mode is exited within 5 seconds of entering Test Mode, DTC U023A87 may be stored. If DTC U023A87 is output after exiting Test Mode, enter Test Mode again, wait at least 5 seconds, then recheck for DTCs.
(b) Confirm the system has entered Test Mode.
(1) Confirm that the ABS warning light, brake system warning light (yellow indicator) and slip indicator light indicate the Test Mode pattern (blinking at 0.25 second intervals).
HINT:
- When in Test Mode, "Traction Control Turned Off" is displayed on the multi-information display.
- When entering Test Mode, if the parking brake is engaged, the parking brake indicator light (red) will illuminate, and if the parking brake is not engaged, the parking brake indicator light (red) will blink in the Test Mode pattern (blinking at 0.25 second intervals).
(c) End of Test Mode
(1) Turn the ignition switch off.
(2) Disconnect the Techstream.
|
|
4. |
CHECK FOR DTCs |
(a) Clear the DTCs.
Body Electrical > Pre-Collision System > Clear DTCs
(b) Make sure that the DTC detection conditions are met.
HINT:
If the detection conditions are not met, the system cannot detect the malfunction.
(c) Check for DTCs.
Body Electrical > Pre-Collision System > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTC U023A87 is not output |
A |
|
DTC U023A87 is output |
B |
| A |
|
END |
| B |
|
|
5. |
CHECK FOR DTCs (Brake/EPB) |
(a) Using the Techstream, check for electronically controlled brake system DTCs.
Chassis > Brake/EPB > Trouble Codes
HINT:
If DTC U023A87 and electronically controlled brake system DTCs are output, perform troubleshooting for the electronically controlled brake system first.
|
Result |
Proceed to |
|---|---|
|
Electronically controlled brake system DTCs are not output |
A |
|
Electronically controlled brake system DTCs are output |
B |
| B |
|
|
|
6. |
PERFORM TEST MODE (ELECTRONICALLY CONTROLLED BRAKE SYSTEM) |
HINT:
When entering Test Mode, the skid control ECU (brake actuator assembly) communicates with the forward recognition camera to judge whether the vehicle is equipped with the pre-collision system. Therefore, do not exit Test Mode within 5 seconds of entering Test Mode.
(a) Procedure to enter Test Mode
(1) Turn the ignition switch off.
(2) Check that the steering wheel is centered.
(3) Check that the shift lever is in P.
(4) Connect the Techstream to the DLC3.
(5) Turn the ignition switch to ON.
(6) Turn the Techstream on.
(7) Switch the skid control ECU (brake actuator assembly) to Test Mode using the Techstream. Enter the following menus: Chassis / Brake/EPB / Utility / Signal Check.
Chassis > Brake/EPB > Utility
|
Tester Display |
|---|
|
Signal Check |
HINT:
Do not exit Test Mode within 5 seconds of entering Test Mode. If Test Mode is exited within 5 seconds of entering Test Mode, DTC U023A87 may be stored. If DTC U023A87 is output after exiting Test Mode, enter Test Mode again, wait at least 5 seconds, then recheck for DTCs.
(b) Confirm the system has entered Test Mode.
(1) Confirm that the ABS warning light, brake system warning light (yellow indicator) and slip indicator light indicate the Test Mode pattern (blinking at 0.25 second intervals).
HINT:
- When in Test Mode, "Traction Control Turned Off" is displayed on the multi-information display.
- When entering Test Mode, if the parking brake is engaged, the parking brake indicator light (red) will illuminate, and if the parking brake is not engaged, the parking brake indicator light (red) will blink in the Test Mode pattern (blinking at 0.25 second intervals).
(c) End of Test Mode
(1) Turn the ignition switch off.
(2) Disconnect the Techstream.
|
|
7. |
CHECK FOR DTCs |
(a) Clear the DTCs.
Body Electrical > Pre-Collision System > Clear DTCs
(b) Make sure that the DTC detection conditions are met.
HINT:
If the detection conditions are not met, the system cannot detect the malfunction.
(c) Check for DTCs.
Body Electrical > Pre-Collision System > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTC U023A87 is not output |
A |
|
DTC U023A87 is output |
B |
| A |
|
END |
| B |
|
|
|