CRUISE CONTROL SYSTEM(for 8NR-FTS), Diagnostic DTC:P057504, P057549

DTC Code DTC Name
P057504 Cruise Control System Internal Failure
P057549 Cruise Control Internal Electronic Failure

DESCRIPTION

A DTC is stored when the ECM detects a malfunction in its internal circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area
P057504 Cruise Control System Internal Failure 0.4 seconds have passed after cruise cancel input signal (STP input) is input to the ECM ECM
P057549 Cruise Control Internal Electronic Failure STP signals input to the ECM supervisory CPU and control ECU are different for 0.15 seconds or more ECM

CAUTION / NOTICE / HINT

Note

Before replacing the ECM, refer to Service Bulletin.

Tech Tips

The ECM receives signals from each sensor to control all functions of the cruise control system. When a DTC is detected, the fail-safe function remains on until the engine switch is off.

PROCEDURE


  1. CHECK FOR DTCS (DTC P057504 AND P057549)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Clear the DTCs.

      Click here


      Powertrain > Cruise Control > Clear DTCs

    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 system operation is possible.

      2. Turn the cruise control system on using the cruise control main switch (ON/OFF).

      3. Push the cruise control main switch to -SET to begin control of vehicle speed using the cruise control system.

    5. Check for DTCs.

      Click here


      Powertrain > Cruise Control > Trouble Codes
      Result
      Result Proceed to
      DTC P057504 and P057549 are not output A
      DTC P057504 or P057549 is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE ECM Click here