- Distance control ECU
- Harness or connector
- Millimeter wave radar sensor
| Last Modified: 11-27-2007 | 1.6 C | |
| Service Category: Engine/Hybrid System | Section: Cruise Control | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000003FEG000X |
| Title: CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: DESCRIPTION (2008 LX570) | ||
|
DTC |
U1102 |
Lost Communication with Radar Sensor |
DESCRIPTION
The distance control ECU sends the vehicle speed and estimated curve information 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 |
|---|---|---|
|
U1102 |
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 distance control ECU to the millimeter wave radar sensor 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 (DISTANCE CONTROL ECU - MILLIMETER WAVE RADAR SENSOR) |
|
(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 |
|
E86-22 (LRDD) - Body ground |
Always |
10 kΩ or higher |
|
A44-2 (SGND) - Body ground |
Always |
10 kΩ or higher |
|
E86-10 (SGND) - Body ground |
|
|
2. |
REPLACE DISTANCE CONTROL ECU |
(a) Replace the distance control ECU with a new one
.
(b) Perform initialization
.
|
|
3. |
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 U1102 is not output.
|
|
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