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 insures that the ECM is functioning properly. If any malfunction is detected, the ECM will illuminate the Malfunction Indicator Lamp (MIL) and set a DTC.

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 one of the following occurs: 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, of 4) any other ECM malfunction is found.

DTC No. DTC Detection Condition Trouble Area

P0604

P0606

P0607

P0657

 ECM internal error ECM

INSPECTION PROCEDURE

Tech Tips

Reed freeze frame data using the intelligent tester. Freeze frame data records the engine condition when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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 OTHER DTC OUTPUT (IN ADDITION TO DTC P0604, P0606, P0607 or P0657)

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

    B

    GO TO RELEVANT DTC CHART

    A

    CHECK AND REPLACE ECM