Dtc P0604 Internal Control Module Random Access Memory (Ram) Error
Engine. Lexus Gs430, Gs300. Uzs190 Grs190
MONITOR DESCRIPTION
INSPECTION PROCEDURE
CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0604, P0606, P0607 or P0657)
DTC P0604 Internal Control Module Random Access Memory (RAM) Error |
DTC P0606 ECM / PCM Processor |
DTC P0607 Control Module Performance |
DTC P0657 Actuator Supply Voltage Circuit / Open |
MONITOR 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 set the appropriate DTC and illuminate 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 2 CPUs also perform continuous mutual monitoring. The ECM illuminates the MIL and sets a DTC if: 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, and 4) any other ECM malfunction is found.DTC No.
| DTC Detection Condition
| Trouble Area
|
P0604
P0606
P0607
P0657
| ECM internal error (1 trip detection logic)
| ECM
|
INSPECTION 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
|