Test K: The Fire Suppression Module (FSM) Does Not Respond To The Diagnostic Tool

PINPOINT TEST K: THE FIRE SUPPRESSION MODULE (FSM) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

K1-K2:

K3-K4:

Normal Operation
The FSM (if equipped) communicates with the diagnostic tool through the controller area network (CAN) circuits 1827 (WH/LG) and 1828 (PK/LG). The FSM also uses the international standards organization (ISO) 9141 communications network circuit 70 (LB/WH). The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open in one of the network circuits, damage to the DLC C251, the FSM C3281a, or a problem in the in-line connectors.

Possible Causes
- CAN data plus circuit 1827 (WH/LG) open
- CAN data minus circuit 1828 (PK/LG) open
- ISO 9141 circuit 70 (LB/WH) open
- FSM C3281a
- FSM