Dtc U1102 Lost Communication With Radar Sensor

Engine Hybrid System. Land Cruiser. Urj200, 202 Grj200 Vdj200
Cruise Control. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (DISTANCE CONTROL ECU - MILLIMETER WAVE RADAR SENSOR)

REPLACE DISTANCE CONTROL ECU

CHECK DTC (DYNAMIC RADAR CRUISE CONTROL SYSTEM)

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 50 km/h (30 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.
  1. Distance control ECU
  2. Harness or connector
  3. Millimeter wave radar sensor

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Cruise Control.Cruise Control System. Dtc U1102 Lost Communication With Radar Sensor


INSPECTION PROCEDURE

NOTICE:
  1. When the distance control ECU is replaced with a new one, initialization must be performed (Click here).
  2. When the millimeter wave radar sensor is replaced with a new one, adjustment of the radar sensor beam axis must be performed (Click here).
  3. 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.
1.CHECK HARNESS AND CONNECTOR (DISTANCE CONTROL ECU - MILLIMETER WAVE RADAR SENSOR)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Cruise Control.Cruise Control System. Dtc U1102 Lost Communication With Radar Sensor

  1. Disconnect the A56 millimeter wave radar sensor connector.

  1. Disconnect the E108 distance control ECU connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A56-3 (LRDD) - E108-22 (LRDD)
    		Always
    		Below 1 Ω
    E108-22 (LRDD) - Body ground
    		Always
    		10 kΩ or higher
    A56-2 (SGND) - Body ground
    		Always
    		10 kΩ or higher
    E108-10 (SGND) - Body ground


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.REPLACE DISTANCE CONTROL ECU

  1. Replace the distance control ECU with a new one (Click here).

  1. Perform initialization (Click here).


NEXT


3.CHECK DTC (DYNAMIC RADAR CRUISE CONTROL SYSTEM)

  1. Using the intelligent tester, enter the following menus: Powertrain / Radar Cruise / Trouble Code.

  1. Clear the DTCs (Click here).

  1. 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 50 km/h (30 mph) or more.

    2. Turn the cruise control main switch on.

    3. Push the -SET switch to activate the dynamic radar cruise control.

  1. Check for DTCs (Click here).

    OK:
    DTC U1102 is not output.


NG
REPLACE MILLIMETER WAVE RADAR SENSOR (Click here)
OK

END (DISTANCE CONTROL ECU IS DEFECTIVE)