Conditions for Setting the DTC: P0604: Notes

The PCM is unable to correctly write and read to and from random access memory (RAM) during the following conditions:

• Key up initialization for one count. Each count is a read and write sample. Each sample is 100 milliseconds. This portion runs once per ignition cycle.
• Counter increments by 10 for each sample that does not correctly read and write to the RAM, and decrements by 1 for each correct sample. No more than 20 counts which do not read and or write correctly. Each read and write sample is 100 milliseconds. This portion runs continuously.
• Counter increments by 10 for each sample that does not correctly read and write to the desired throttle position RAM and decrements by 1 for each correct sample. No more than 20 counts which do not read and/or write correctly. Each read and write sample is 12.5 milliseconds. This portion runs continuously.