DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:C1A52

DTC Code DTC Name
C1A52 Driving Support ECU Communication Abnormal

DESCRIPTION

DTC C1A52 is stored when the hybrid vehicle control ECU cannot recognize the driving support ECU assembly.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A52 Driving Support ECU Communication Abnormal Approximately 17 seconds after the power switch is turned on (IG), the hybrid vehicle control ECU cannot recognize the driving support ECU assembly for approximately 1.3 seconds or more.

  • Hybrid vehicle control ECU

  • Driving support ECU assembly

CAUTION / NOTICE / HINT

Note


  • Before replacing the hybrid vehicle control ECU, refer to Service Bulletin.

  • When replacing the driving support ECU assembly, always replace it with a new one. If a driving support ECU assembly which was installed to another vehicle is used, the information stored in the driving support ECU assembly will not match the information from the vehicle. As a result, a DTC may be stored.

  • First check the CAN communication system by following How to Proceed with Troubleshooting. After checking that there are no malfunctions in the CAN communication system, proceed with troubleshooting.

    Click here

PROCEDURE


  1. CHECK FOR DTC (RADAR CRUISE 2)


    1. Clear the DTCs.

      Click here


      Powertrain > Radar Cruise2 > Clear DTCs

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

      Tech Tips

      If the detection conditions are not met, the system cannot detect the malfunction.

    3. Check for DTCs.

      Click here


      Powertrain > Radar Cruise2 > Trouble Codes
      Result
      Result Proceed to
      DTC C1A52 is not output A
      DTC C1A52 is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  2. REPLACE HYBRID VEHICLE CONTROL ECU


    1. Replace the hybrid vehicle control ECU.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK FOR DTC (RADAR CRUISE 2)


    1. Clear the DTCs.

      Click here


      Powertrain > Radar Cruise2 > Clear DTCs

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

      Tech Tips

      If the detection conditions are not met, the system cannot detect the malfunction.

    3. Check for DTCs.

      Click here


      Powertrain > Radar Cruise2 > Trouble Codes
      Result
      Result Proceed to
      DTC C1A52 is not output A
      DTC C1A52 is output B

    A

    END (HYBRID VEHICLE CONTROL ECU WAS DEFECTIVE)

    B

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here