DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:P1631

DTC Code DTC Name
P1631 Communication Error from HV ECU to Skid Control ECU

DESCRIPTION

The hybrid vehicle control ECU 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 booster with master cylinder assembly) when the dynamic radar cruise control is operating. Therefore, if the skid control ECU detects a communication error with the hybrid vehicle control ECU, it sends a malfunction signal back to the hybrid vehicle control ECU.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

P1631

Communication Error from HV ECU to Skid Control ECU

While the vehicle speed is 40 km/h (25 mph) or more and the dynamic radar cruise control system is operating, the hybrid vehicle control ECU continuously receives a logical error signal from the skid control ECU (brake booster with master cylinder assembly) for approximately 1 second or more.

  • Communication circuit

  • Hybrid vehicle control ECU

  • Skid control ECU (brake booster with master cylinder 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.

      Tip:

      Refer to CAN Bus Check for the CAN communication system.

    Result

    Proceed to

    OK

    NG
    NG

    GO TO CAN COMMUNICATION SYSTEM

    OK

  2. REPLACE HYBRID VEHICLE CONTROL ECU

    1. Replace the hybrid vehicle control ECU with a new one.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  3. CHECK FOR DTCs

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

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

      Tip:

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

      1. Turn the power switch on (IG).

      2. Turn the dynamic radar cruise control system on using the cruise control main 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

      Powertrain > Radar Cruise1 > Trouble Codes

      Result

      Result

      Proceed to

      DTC is not output

      A

      DTC P1631 is output

      B
    A

    END

    B

    REPLACE SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY)