09080-07820 GOVERNOR ASSY, MEC Denso Cross

Standard Preamble
The first four bytes of every IID contain a standard preamble.50xxyyzz (IID specific data)The 50 indicates M5X protocol.xx is the module identifier of the sending module.
Table 1
XX     Module    
00     Host Device    
01     CCM    yy is the Instruction Identifier.
Table 2
yy     IID    
00     Special Parameter Command    
10     Broadcast Response    
11     Activate a Broadcast List.    
12     Deactivate a Broadcast List.    
13     Program a Broadcast List.    
15     Status Response to IID 11, 12, and 13    
24     Single Parameter Read Request    
25     Single Parameter Read Response    
34     Single Parameter Write Request    
35     Single Parameter Write Response    zz is the number of bytes in the message after this byte. zz does not include the checksum. This value will change depending on the data that is associated with the IID.Checksum Calculation
The checksum is an important part of the M5X message. By using the checksum, the integrity of the message is determined. The second to last byte of every IID is the checksum, which is followed by an ASCII carriage return ($0D). The checksum is a 2's complement value of the summation of all the data bytes in the message. The message is a good message if all the bytes and the checksum add to zero (0).The following message is an example.5000240400580082AE<cr>The checksum for this message is AE. Although the message is sent in ASCII, the checksum must be calculated by using the hexadecimal value.
Table 3
Byte     ASCII Value     Hexadecimal Value    
50     $35 $30     $50    
00     $30 $30     $00    
24     $32 $34     $24    
04     $30 $34     $04    
00     $30 $30     $00    
58     $35 $38     $58    
00     $30 $30     $00    
82     $38 $32     $82    
Total         $152    
Truncated to LSB         $52    
2's Compement     $41 $45     $AE    
Total         $100    
Truncated to LSB         $00    CCM Heartbeat
You should check the connection to the CCM before you log in to the CCM. You should also check the connection (heartbeat) to the CCM during normal operation from time to time. The recommended PID is $F0 $12. Use PID $F0 $12 to read the current Security Level at a regular interval as a heartbeat. If the CCM does not answer to the read request, then there is a problem with the connection. This PID will also monitor the Security Level, which may have been changed.Security Levels
Every PID has an associated security level (0, 1, 2, or 3) within the CCM. A user within a particular security level may use PID's in that level or lower levels. PID's cannot be accessed by the user in levels higher than the password allows. For example, a user at