SCP Network Failure Modes
NOTE:
When a network failure is indicated, use a DVOM for diagnosis. A scan tool is only capable of testing network signals.
An open circuit in a SCP high (+) or SCP low (-) wire will not stop communication. Data will only be transferred with good circuits and chassis grounds. If both wires are open, some data will be lost and signal communication will stop at the open circuit. Communication will continue between modules on same side of open. Different circuit conditions will give different network conditions. See NETWORK COMMUNICATION FAILURE CONDITIONS table.
NETWORK COMMUNICATION FAILURE CONDITIONS
| Wire | Condition | Communication |
|---|---|---|
| SCP High (+) | Open | Yes, If SCP Low (-) Is Functioning |
| SCP High (+) | Short To Ground | Yes, If SCP Low (-) Is Functioning |
| SCP High (+) | Short To Battery | No |
| SCP High (+) | Short To SCP Low (-) | No |
| SCP Low (-) | Open | Yes, If SCP High (+) Is Functioning |
| SCP Low (-) | Short To Ground | No |
| SCP Low (-) | Short To Battery | Yes, If SCP High (+) Is Functioning |
| SCP Low (-) | Short To SCP High (+) | No |