DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:P1631

DTC Code DTC Name
P1631 Communication Error from ECM to VSC

DESCRIPTION

The ECM sends signals such as A/T information signals, dynamic radar cruise control operation signals, brake operation demand signals, and buzzer operation demand signals to the skid control ECU when the dynamic radar cruise control is in operation. The ECM is the only component that has a function to record and output the DTCs in the dynamic radar cruise control system. Therefore, if the skid control ECU detects a communication error from the ECM, it sends a malfunction signal back to the ECM.

DTC No. DTC Detection Condition Trouble Area
P1631 While the dynamic radar cruise control is either preparing for operation or operating, if the ECM continuously receives a logical error signal from the skid control ECU for a certain amount of time, the ECM records this logical error code

  • ECM

  • Brake actuator assembly (Skid control ECU)

INSPECTION PROCEDURE

Note

When the ECM is replaced with a new one, initialization must be performed Click here.

PROCEDURE


  1. REPLACE ECM


    1. Replace the ECM (for 2UR-GSE) Click here.


    NEXT

  2. 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 P1631 is not output A
      DTC P1631 is output B

    B

    REPLACE BRAKE ACTUATOR (SKID CONTROL ECU) Click here

    A

    END