DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:P1616

DTC Code DTC Name
P1616 Communication Error from ECM to Distance Control ECU

DESCRIPTION

The ECM receives signals from each sensor and ECU, then sends signals such as A/T signals, cruise control operation signals, low speed operation signals, brake control operation signals, and radar beam emission prohibiting signals to the driving support ECU assembly. The ECM is the only component that has a function to store and output DTCs in the dynamic radar cruise control system. Therefore, if the driving support ECU assembly detects a communication error from the ECM, it sends a malfunction signal back to the ECM.

DTC No. Detection Item DTC Detection Condition Trouble Area
P1616 Communication Error from ECM to Distance Control ECU While the dynamic radar cruise control is either preparing for operation or operating, the ECM continuously receives a logic error signal from the driving support ECU assembly for more than a certain amount of time, the ECM stores this DTC.

  • ECM

  • Driving support ECU assembly

INSPECTION PROCEDURE

Note


  • If the ECM is replaced, refer to Registration Click here.

  • 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.

PROCEDURE


  1. REPLACE ECM


    1. Replace the ECM with a new one Click here for 2AR-FE, Click here for 2GE-FE).


    NEXT

  2. CHECK FOR DTCS (DTC P1616)


    1. Connect the Techstream to the DLC3.

    2. Turn the engine switch on (IG).

    3. Clear the DTCs Click here.

    4. Perform the following to make sure that the DTC detection conditions are met.

      Tech Tips

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


      1. Drive the vehicle at a speed for which cruise control operation is possible.

      2. Turn the cruise control main switch on.

    5. Enter the following menus: Powertrain / Radar Cruise / Trouble Codes.

    6. Check for DTCs.

      Result
      Result Proceed to
      DTCs are not output A
      DTC P1616 is output B

    7. Turn the engine switch off.


    B

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    A

    END (ECM WAS DEFECTIVE)