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

  • Communication circuit

  • ECM

  • Brake actuator assembly (Skid control ECU)

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK DTC (CAN COMMUNICATION SYSTEM)


    1. Check for DTCs Click here.


    NG

    GO TO CAN COMMUNICATION SYSTEM Click here

    OK

  2. REPLACE ECM


    1. Replace the ECM (for 2GR-FE) Click here.


    NEXT

  3. CHECK DTC (RADAR CRUISE CONTROL SYSTEM)


    1. Clear the DTCs Click here.

    2. 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 of 50 km/h (31 mph) or more.

      2. Turn the cruise control main switch on.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC P1631 is output B

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    END