DTC    P0604    Internal Control Module Random Access Memory (RAM) Error

DTC    P0606    ECM / PCM Processor

DTC    P060A    Internal Control Module Monitoring Processor Performance

DTC    P060B    Internal Control Module A/D Processing Performance

DTC    P060D    Internal Control Module Accelerator Pedal Position Performance

DTC    P060E    Internal Control Module Throttle Position Performance

DTC    P0657    Actuator Supply Voltage Circuit / Open

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DESCRIPTION

The ECM continuously monitors its own internal memory status, internal circuits, and output signals transmitted to the throttle actuator. This self-check insures that the ECM is functioning properly. If any malfunction is detected, the ECM sets the appropriate DTC and illuminates 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 two CPUs also perform continuous mutual monitoring. The ECM illuminates the MIL and sets a DTC if: 1) outputs from the two CPUs are different or 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, or 4) any other ECM malfunction is found.

DTC No.
DTC Detection Condition
Trouble Area
P0604
P0606
P060A
P060B
P060D
P060E
P0657
ECM internal error
(1 trip detection logic)
ECM

INSPECTION PROCEDURE

Read freeze frame data using an 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.
1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO ECM INTERNAL ERROR DTC)

  1. Connect an intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

  1. Read DTCs.

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


B
CHECK FOR INTERMITTENT PROBLEMS (Click here)
A

REPLACE ECM (Click here)