Inspection and Verification
INSPECTION AND VERIFICATIONWARNING:
- Always wear safety glasses when repairing a fire suppression system vehicle and when handling a fire suppressor. This will reduce the risk of injury in the event of an accidental deployment.
- To reduce the risk of accidental deployment, never probe the connectors on the fire suppressors. Failure to follow this instruction may result in personal injury.
- The fire suppression module (FSM) orientation is critical for correct system operation. If a vehicle equipped with a fire suppression system has been involved in a collision in which the rear floor panel area has been damaged, inspect the mounting bracket for damage. If the mounting bracket is damaged, a new FSM must be installed whether or not the fire suppressors have deployed. In addition, make sure the area of the FSM mounting area is restored to its original condition.
- If the vehicle is equipped with a fire suppression system, be sure that nobody is under the vehicle or near the rear axle area when the battery is connected due to possibility of an accidental fire suppression system deployment. Failure to follow these instructions may result in personal injury.
- Diagnosis of the fire suppression system must be performed with the fire suppression module (FSM) attached to the vehicle. Disruption of the FSM chassis to vehicle ground while probing wiring may result in fire suppressors deployment. Failure to follow this instruction may result in personal injury.
1. Verify the customer concern.
Visual Inspection Chart:
2. NOTE: If the fire suppression system has been activated, the following components must be replaced with new components:
- fire suppression module (FSM)
- fire suppressors
- fire suppressor manifolds
- fire suppression manual switch (if the plastic cover is damaged)
Visually inspect for obvious signs of mechanical or electrical damage.
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. If the cause is not visually evident, connect the diagnostic tool to the data link connector (DLC) and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
- check that the program card is correctly installed.
- check the connections to the vehicle.
- check the ignition switch position.
5. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
6. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
- ISO, SCP, or CAN circuits fault; all electronic control units no response/not equipped, refer to Information Bus (Module Communications Network).
- No response/not equipped for FSM, refer to Body Control Systems (Multifunction Electronic Control Module).
- System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out the self-test diagnostics for the FSM.
7. If the DTCs retrieved are related to the concern, go to the Fire Suppression Module (FSM) Diagnostic Trouble Code (DTC) Index. Diagnostic Trouble Code Tests and Associated Procedures
8. If no DTCs related to the concern are retrieved, GO to Symptom Chart. Symptom Related Diagnostic Procedures