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 transmitted to the throttle actuator. This self-check ensures that the ECM is functioning properly. If any malfunction is detected, the ECM stores the appropriate DTC and illuminates the MIL.

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

DTC No. DTC Detection Condition Trouble Area

P0604

P0606

P0607

P0657

 An ECM internal error (1 trip detection logic). ECM

INSPECTION PROCEDURE

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0604, P0606, P0607 OR P0657)


    1. Connect the intelligent tester to the DLC3.

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

    3. Enter the following menus: Powertrain / Engine and ECT / DTC.

    4. Read the DTCs.

      Result
      Result Proceed to
      DTC P0604, P0606, P0607 or P0657 output A
      P0604, P0606, P0607 or P0657 and other DTCs output B

    B

    GO TO DTC CHART Click here

    A

    REPLACE ECM Click here