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 PCM 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 |
•
Check RAM Area / Communication connections | 1. Contact resistance in connectors 2. Faulty PCM |
Enable Conditions |
•
Ignition ON | |
Threshold Value |
•
RAM test / Checksum / SPI communication : failure | |
Diagnostic Time |
•
0.1 second | |
MIL On Condition |
•
Immediate |
