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 and brake 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 vehicle speed is 40 km/h (25 mph) or more and the dynamic radar cruise control system is operating (vehicle-to-vehicle distance control mode), if the ECM continuously receives a logical error signal from the skid control ECU (brake actuator assembly) for approximately 1 second or more.

  • Communication circuit

  • ECM

  • Skid control ECU (brake actuator assembly)

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


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

      OK
      CAN communication system is functioning normally.

      Tech Tips

      Refer to CAN Bus Check for the CAN communication system.

      for LHD with Central Gateway ECU: Click here

      for RHD with Central Gateway ECU: Click here

      Result
      Proceed to
      OK
      NG

    NG

    GO TO CAN COMMUNICATION SYSTEM for LHD with Central Gateway ECU: Click here
    GO TO CAN COMMUNICATION SYSTEM for RHD with Central Gateway ECU: Click here

    OK

  2. REPLACE ECM


    1. Replace the ECM with a new one.

      for 2AD-FHV: Click here

      for 2AD-FTV: Click here

      for 2AR-FE: Click here

      for 3ZR-FAE: Click here

      for 3ZR-FE: Click here

      for 2WW: Click here

      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK FOR DTCs


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Make sure that the DTC detection conditions are met.

      Tech Tips

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


      1. Turn the ignition switch to ON.

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

      3. Drive the vehicle at 40 km/h (25 mph) or more for 1 second or more.

    4. Enter the following menus: Powertrain / Radar Cruise1 / Trouble Codes.

    5. Check for DTCs.

      Click here


      1. for 2AD-FHV, 2AD-FTV:


        Powertrain > Radar Cruise1 > Trouble Codes

      2. for 2AR-FE, 3ZR-FE, 3ZR-FAE:


        Powertrain > Radar Cruise1 > Trouble Codes

      3. for 2WW:


        Powertrain > Cruise Control > Trouble Codes
      Result
      Result Proceed to
      DTC P1631 is not output A
      DTC P1631 is output B

    A

    END

    B

    REPLACE ECM Click here