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 (brake actuator assembly) when the dynamic radar cruise control is operating. The ECM is the only component that has a function to store and output DTCs in the dynamic radar cruise control system. Therefore, if the skid control ECU (brake actuator assembly) detects a communication error from the ECM, it sends a malfunction signal back to the ECM.

DTC No. Detection Item DTC Detection Condition Trouble Area
P1631 Communication Error from ECM to VSC While the dynamic radar cruise control is either preparing for operation or operating, the ECM continuously receives a logic error signal from the skid control ECU (brake actuator assembly) for a certain amount of time, the ECM stores this DTC.

  • Communication circuit

  • ECM

  • Skid control ECU (brake actuator assembly)

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Using the GTS, check if the CAN communication system is functioning normally.

      Click here

      Result
      Result Proceed to
      CAN communication system DTCs are not output OK
      CAN communication system DTCs are output NG

    NG

    GO TO CAN COMMUNICATION SYSTEM Click here

    OK

  2. REPLACE ECM


    1. Replace the ECM with a new one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK FOR DTCS (DTC P1631)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Clear the DTCs.

      Click here

    4. Perform the following to make sure that the DTC detection conditions are met.

      Tech Tips

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


      1. Drive the vehicle at a speed for which cruise control operation is possible.

      2. Turn the dynamic radar cruise control system on using the cruise control main switch (ON-OFF button).

    5. Enter the following menus: Powertrain / Radar Cruise / Trouble Codes.

    6. Check for DTCs.


      Powertrain > Radar Cruise > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      DTC P1631 is output B

    7. Turn the engine switch off.


    A

    END

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here