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CRUISE CONTROL SYSTEM (for 1WW), Diagnostic DTC:C1A52

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DTC Code DTC Name
C1A52 Driving Support ECU Communication Abnormal
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DESCRIPTION

The DTC C1A52 is stored when the ECM cannot recognize the driving support ECU.

DTC Code DTC Detection Condition Trouble Area
C1A52 While vehicle is being drive at speed of approximately 40 km/h (25 mph) or more and cruise control main switch is on, ECM does not recognize driving support ECU or ECM rejects cruise control request from driving support ECU.

  • ECM

  • Driving support ECU
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INSPECTION PROCEDURE

Note:

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

  • After turning the ignition switch off, make sure to wait at least 6 minutes before disconnecting the ECM connector or replacing the ECM.

  • After replacing the ECM, the new ECM needs registration (Click here) and initialization (Click here).

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PROCEDURE


  1. Click here

    CHECK FOR DTC


    1. Clear the DTCs (Click here).

    2. Check for DTCs (Click here).

      OK
      DTC C1A52 is not output

  2. Click here

    USE SIMULATION METHOD TO CHECKClick here

  3. Click here

    REPLACE ECM


    1. Replace the ECM with a new one (Click here).


  4. Click here

    CHECK FOR DTC


    1. Clear the DTCs (Click here).

    2. Check for DTCs (Click here).

      OK
      DTC C1A52 is not output
      Table 1. Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

  5. Click here

    END (ECM WAS DEFECTIVE)

  6. Click here

    REPLACE DRIVING SUPPORT ECUClick here

  7. Click here

    REPLACE DRIVING SUPPORT ECUClick here