SFI SYSTEM, Diagnostic DTC:P0604, P0606, P0607, P0657

DTC Code DTC Name
P0604 Internal Control Module Random Access Memory (RAM) Error
P0606 ECM / PCM Processor
P0607 Control Module Performance
P0657 Actuator Supply Voltage Circuit / Open

DESCRIPTION

The ECM continuously monitors its internal memory status, internal circuits, and output signals sent to the throttle actuator. This self-check ensures that the ECM is functioning properly. If any malfunction is detected, the ECM will set the appropriate DTC and illuminate the MIL.

The ECM memory status is diagnosed by internal "mirroring" of the main CPU and the sub CPU to detect Random Access Memory (RAM) errors. The 2 CPUs also perform continuous mutual monitoring. The ECM illuminates the MIL and sets a DTC if: 1) outputs from the 2 CPUs are different and deviate from the standards, 2) the signals sent to the throttle actuator deviate from the standards, 3) a malfunction is found in the throttle actuator supply voltage, and 4) any other ECM malfunction is found.

DTC No. DTC Detection Condition Trouble Area

P0604

P0606

P0607

P0657

 ECM internal error (1 trip detection logic) ECM

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE


  1. READ OUTPUT DTC


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Clear the DTCs Click here.

    5. Turn the engine switch off and turn the tester off.

    6. Disconnect the tester.

    7. Disconnect the cable from the negative (-) battery terminal and wait for 1 minute.

    8. Connect the cable to the negative (-) battery terminal.

    9. Connect the tester to the DLC3.

    10. Turn the engine switch on (IG) and turn the tester on.

    11. Enter the following menus: Powertrain / Engine / DTC.

    12. Read the DTCs.

      Result
      Result Proceed to
      DTC P0604, P0606, P0607 and/or P0657 are output A
      DTC is not output B

    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

    REPLACE ECM Click here