SFI SYSTEM, Diagnostic DTC:P0604, P0606, P060A, P060B, P060D, P060E, P0657, P1607

DTC Code DTC Name
P0604 Internal Control Module Random Access Memory (RAM) Error
P0606 ECM / PCM Processor
P060A Internal Control Module Monitoring Processor Performance
P060B Internal Control Module A/D Processing Performance
P060D Internal Control Module Accelerator Pedal Position Performance
P060E Internal Control Module Throttle Position Performance
P0657 Actuator Supply Voltage Circuit / Open
P1607 Cruise Control Input Processor

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 CPUs 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 detected in the throttle actuator supply voltage, or 4) any other ECM malfunction is detected.

DTC No. DTC Detection Condition Trouble Area

P0604

P0606

P060A

P060B

P060D

P060E

P0657

P1607

 ECM internal error (1 trip detection logic). ECM

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition 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, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. CHECK WHETHER DTC OUTPUT RECURS


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

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

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC P0604, P0606, P060A, P060B, P060D, P060E and/or P0657 is output A
      DTC is not output B

    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

    REPLACE ECM Click here