Test O
PINPOINT TEST O: NO STANDARD CORPORATE PROTOCOL (SCP) NETWORK COMMUNICATIONTest O1:
Test O1-O3:
Test O3-O5:
Test O5-O7:
Test O7-O9:
Test O9-O12:
Test O12-O14:
Test O14-O16:
Test O17-O21:
Normal Operation
The smart junction box (SJB), powertrain control module (PCM), instrument cluster, anti-lock brake (ABS) module, dual automatic temperature control (DATC) module (or the function selector switch), and the speed control actuator communicate with the diagnostic tool through the SCP communications network circuits. If one of the bus wires become shorted to ground or voltage, or if some but not all termination resistors are lost, communications can continue at a degraded level. If a module is lost due to internal concerns, communications can continue to all other modules. Check the SCP communications network circuits between the networked modules and the DLC C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open in one or both SCP communications network circuits, damage to the module connector, a problem with a in-line connector, or a problem with the DLC C251. If, after individual checks of each circuit leading to a module show resistance values less than 5 ohms, and no in-line connector issues present, the data link diagnostics test must be run with the module in question disconnected. If the data links diagnostics test passes with the module in question disconnected it is the source of the concern and should be removed and a new module installed.
Possible Causes
- SCP circuits 914 (TN/OG) and 915 (PK/LB), shorted to ground or open
- SJB
- PCM
- instrument cluster
- ABS module
- DATC module or the function selector switch
- speed control actuator