Dynamic Radar Cruise Control System

CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: U1102-738: Communication Error from Distance Control ECU to Radar Sensor
U1102-738 - Communication Error from Distance Control ECU to 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.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* When the distance control ECU is replaced with a new one, initialization must be performed Installation.
* When the millimeter wave radar sensor is replaced with a new one, adjustment of the radar sensor beam axis must be performed Adjustments.

PROCEDURE

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

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

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

Standard Resistance:





(c) Reconnect the distance control ECU and millimeter wave radar sensor connectors.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (DISTANCE CONTROL ECU - MILLIMETER WAVE RADAR SENSOR)
OK -- Continue to next step.

2. REPLACE DISTANCE CONTROL ECU

(a) Replace the distance control ECU Components.

(b) Initialize the distance control ECU Installation.

NEXT -- Continue to next step.

3. CHECK DTC OUTPUT

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTCs Dynamic Radar Cruise Control System.

(e) Perform the following to make sure that the DTC detection conditions are met.

HINT
If the detection conditions are not met, the malfunction cannot be detected.

(1) Drive at a speed of between 45 and 140 km/h (27 and 87 mph).

(2) Turn the cruise control main switch on.

(3) Push the -SET switch to activate the cruise control.

(f) Enter the following menus: Powertrain / Radar Cruise / Trouble Codes.

(g) Read the DTCs Dynamic Radar Cruise Control System.

Result:





B -- REPLACE MILLIMETER WAVE RADAR SENSOR Components

A -- END