DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:U1102

DTC Code DTC Name
U1102 Lost Communication with Radar Sensor

DESCRIPTION

The millimeter wave radar sensor and distance control ECU transmit the data for general vehicle control and diagnosis function along the communication line. The distance control ECU determines the curve radius information based on signals from the steering wheel and yaw rate and acceleration sensor. The distance control ECU transmits the current vehicle speed and curve radius information to the millimeter wave radar sensor.

DTC No. DTC Detection Condition Trouble Area
U1102 The ECM detects a communication error signal (from the distance control ECU to the millimeter wave radar sensor) for 0.15 sec. or more while the dynamic radar cruise control is in operation

  • Communication circuit

  • Millimeter wave radar sensor

  • Distance control ECU

WIRING DIAGRAM

A0160AJE01

INSPECTION PROCEDURE

Note


  • When the distance control ECU is replaced with a new one, initialization must be performed Click here.

  • When the millimeter wave radar sensor is replaced with a new one, adjustment of the radar sensor beam axis must be performed Click here.

PROCEDURE


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


    1. A01639UE02

      Disconnect the distance control ECU and millimeter wave radar sensor connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J17-23 (LRRD) - B9-4 (LRRD) Always Below 1 Ω
      J17-13 (IGB) - B9-5 (IGB) Always Below 1 Ω
      J17-23 (LRRD) - Body ground Always 10 kΩ or higher
      J17-13 (IGB) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. REPLACE DISTANCE CONTROL ECU


    1. Replace the distance control ECU Click here.

    2. Initialize the distance control ECU Click here.


    NEXT

  3. CHECK DTC


    1. Clear the DTC Click here.

    2. Turn the cruise control main switch on.

    3. Drive the vehicle at the require speed (45 km/h (27 mph) or higher).

    4. Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTC U1102 is not output A
      DTC U1102 is output B

    B

    REPLACE MILLIMETER WAVE RADAR SENSOR Click here

    A

    END