DTC P0601, P0604, P0606, P0607, P0657: INTERNAL CONTROL MODULE MEMORY CHECK SUM ERROR, RANDOM ACCESS MEMORY (RAM) ERROR, ECM/PCM PROCESSOR, CONTROL MODULE PERFORMANCE & ACTUATOR SUPPLY VOLTAGE CIRCUIT/OPEN
MONITOR 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, and
4) any other ECM malfunction is found
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Monday, January 19th, 2009 AT 9:05 PM
