- Millimeter wave radar sensor
- Distance control ECU
- Harness or connector
- CAN communication system
| Last Modified: 11-27-2007 | 1.6 C | |
| Service Category: Engine/Hybrid System | Section: Cruise Control | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000003FEF000X |
| Title: CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: DESCRIPTION (2008 LX570) | ||
|
DTC |
U0235 |
Lost Communication with Cruise Control Front Distance Range Sensor |
DESCRIPTION
The distance control ECU sends general vehicle control information, such as vehicle speed, steering angle, etc., to the millimeter wave radar sensor. The millimeter wave radar sensor sends information about whether another vehicle is present in front of the vehicle, the distance between the vehicles, relative speed, etc. to the distance control ECU. The distance control ECU sends this information to the ECM and performs control of cruise control.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
U0235 |
The vehicle speed is 40 km/h (25 mph) or more with the cruise control main switch on (vehicle-to-vehicle distance control mode) and the data sent from the millimeter wave radar sensor to the distance control ECU is abnormal. |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
-
When the distance control ECU is replaced with a new one, initialization must be performed
.
-
When the millimeter wave radar sensor is replaced with a new one, adjustment of the radar sensor beam axis must be performed
.
- As it is possible that this DTC was stored due to a bad connection of a connector, make sure to check that each connector is connected securely.
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (MILLIMETER WAVE RADAR SENSOR - DISTANCE CONTROL ECU) |
|
(a) Disconnect the A44 millimeter wave radar sensor connector. |
(b) Disconnect the E86 distance control ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A44-3 (LRDD) - E86-22 (LRDD) |
Always |
Below 1 Ω |
|
A44-5 (IGB) - E86-13 (IGB) |
||
|
E86-22 (LRDD) - Body ground |
Always |
10 kΩ or higher |
|
E86-13 (IGB) - Body ground |
||
|
A44-2 (SGND) - Body ground |
Always |
10 kΩ or higher |
|
E86-10 (SGND) - Body ground |
|
|
2. |
CHECK DISTANCE CONTROL ECU |
|
(a) Disconnect the A44 millimeter wave radar sensor connector. |
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
E86-13 (IGB) - E86-10 (SGND) |
Engine switch on (IG) |
11 to 14 V |
|
E86-22 (LRDD) - E86-10 (SGND) |
4.5 to 5.5 V |
|
|
3. |
REPLACE MILLIMETER WAVE RADAR SENSOR |
(a) Replace the millimeter wave radar sensor with a new one
.
(b) Adjust the millimeter wave radar sensor
.
|
|
4. |
CHECK DTC (DYNAMIC RADAR CRUISE CONTROL SYSTEM) |
(a) Using the Techstream, enter the following menus: Powertrain / Radar Cruise / Trouble Code.
(b) Clear the DTCs
.
(c) Perform the following to make sure the DTC detection conditions are met.
HINT:
If the detection conditions are not met, the system cannot detect the malfunction.
(1) Drive the vehicle at a speed of 40 km/h (25 mph) or more.
(2) Turn the cruise control main switch on.
(3) Push the -SET switch to activate the dynamic radar cruise control.
(d) Check for DTCs
.
OK:
DTC U0235 is not output.
|
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