A malfunction is detected by using a checksum technique for verifying data. The digital data is composed of zeros and ones. A checksum is the total of all ones in a string of data. By comparing the checksum value with a stored value, a malfunction can be detected.
The ECM monitors RAM areas and communication connections between microcontroller and output drivers and sets DTC P0605 if failure is detected.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Internal control module read only memory(ROM) error
? Contact resistance in connectors
? Defective ECM
Enable Conditions
? Ignition ON
Threshold Value
? Interanl check
Diagnostic Time
? 0.1 sec.