DYNAMIC RADAR CRUISE CONTROL SYSTEM(except 2AR-FE), Diagnostic DTC:C1A52

DTC Code DTC Name
C1A52 Radar Cruise Control Presence Determination Malfunction (Engine / HV)

DESCRIPTION

DTC C1A52 is stored when the ECM cannot recognize the millimeter wave radar sensor assembly.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A52 Radar Cruise Control Presence Determination Malfunction (Engine / HV) Approximately 17 seconds after the ignition switch is ON, the ECM cannot recognize the millimeter wave radar sensor assembly for approximately 1.3 seconds or more.

  • ECM

  • Millimeter wave radar sensor assembly

CAUTION / NOTICE / HINT

Note


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

  • When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed.

    Click here

  • Before replacing the ECM, refer to Service Bulletin.

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs.


      Powertrain > Radar Cruise2 > Clear DTCs

    2. Perform the following procedure.

      Tech Tips

      If the following procedure is not performed, the previously output DTC cannot be detected.


      1. Turn the ignition switch to ON.

      2. Wait for 20 seconds or more.

    3. Check for DTCs.


      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 ECM


    1. Replace the ECM.

      for A25A-FKS: Click here

      for 2GR-FKS: Click here

      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK FOR DTC


    1. Clear the DTCs.


      Powertrain > Radar Cruise2 > Clear DTCs

    2. Perform the following procedure.

      Tech Tips

      If the following procedure is not performed, the previously output DTC cannot be detected.


      1. Turn the ignition switch to ON.

      2. Wait for 20 seconds or more.

    3. Check for DTCs.


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

    A

    END (ECM WAS DEFECTIVE)

    B

    REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY Click here