DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:C1A40

DTC Code DTC Name
C1A40 ENG / EHV Device

DESCRIPTION

When the driving support ECU receives a hybrid control system or SFI system malfunction signal, DTC C1A40 is stored.

DTC Code DTC Detection Condition Trouble Area
C1A40

  1. Diagnosis condition for each system:


    • Pre-crash safety system:


      • Power switch on (IG)


    • Radar cruise control system:


      • Vehicle is being driven at speed of approximately 50 km/h (31 mph) or more and distance control switch is on

  2. Driving support ECU detects problem with hybrid control system transmission signal

  • Hybrid control system

  • Power management control ECU

  • SFI system

  • ECM

  • Driving support ECU

INSPECTION PROCEDURE

Note

If the power management control ECU is replaced, refer to the Service Bulletin.

PROCEDURE


  1. CHECK FOR DTC (HYBRID CONTROL SYSTEM)


    1. Clear the DTCs Click here.

    2. Make sure the following conditions are met:

      Tech Tips

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


      • Pre-crash safety system:

        The power switch on (IG).

      • Radar cruise control system:

        The vehicle is being driven at a speed of approximately 50 km/h (31 mph) or more and the distance control switch is on.

    3. Check for DTCs Click here.

      OK
      Hybrid control system DTCs are not output.

    NG

    GO TO HYBRID CONTROL SYSTEM Click here

    OK

  2. CHECK FOR DTC (SFI SYSTEM)


    1. Clear DTCs Click here.

    2. Make sure the following conditions are met:

      Tech Tips

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


      • Pre-crash safety system:

        The power switch on (IG).

      • Radar cruise control system:

        The vehicle is being driven at a speed of approximately 50 km/h (31 mph) or more and the distance control switch is on.

    3. Check for DTCs Click here.

      OK
      SFI system DTCs are not output.

    NG

    GO TO SFI SYSTEM Click here

    OK

  3. CHECK FOR DTC (PRE-CRASH SAFETY SYSTEM)


    1. Clear the DTCs Click here.

    2. Make sure the following conditions are met:

      Tech Tips

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


      • Pre-crash safety system:

        The power switch on (IG)

      • Radar cruise control system:

        The vehicle is being driven at a speed of approximately 50 km/h (31 mph) or more and the distance control switch is on.

    3. Check for DTCs Click here.

      OK
      DTC C1A40 is not output.

    NG

    REPLACE DRIVING SUPPORT ECU Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  4. REPLACE DRIVING SUPPORT ECU


    1. Replace the driving support ECU with a new one Click here.

      Note

      When replacing the driving support ECU, always replace it with a new one and be sure to perform initialization Click here. If an ECU which was installed to another vehicle is used, the information stored in the ECU will not match the information from the vehicle, and as a result, a DTC may be stored.


    NEXT

  5. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Make sure the following conditions are met:

      Tech Tips

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


      • Pre-crash safety system:

        The power switch on (IG).

      • Radar cruise control system:

        The vehicle is being driven at a speed of approximately 50 km/h (31 mph) or more and the distance control switch is on.

    3. Check for DTCs Click here.

      OK
      DTC C1A40 is not output.

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

    END (DRIVING SUPPORT ECU WAS DEFECTIVE)

  6. REPLACE POWER MANAGEMENT CONTROL ECU


    1. Replace the power management control ECU with a new one Click here.


    NEXT

  7. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Make sure the following conditions are met:

      Tech Tips

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


      • Pre-crash safety system:

        The power switch on (IG).

      • Radar cruise control system:

        The vehicle is being driven at a speed of approximately 50 km/h (31 mph) or more and the distance control switch is on.

    3. Check for DTCs Click here.

      OK
      DTC C1A40 is not output.

    NG

    REPLACE ECM Click here

    OK

    END (POWER MANAGEMENT CONTROL ECU WAS DEFECTIVE)