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 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 fire suppression module must be installed whether or not the fire suppressors have deployed. In addition, make sure the area of the fire suppression module 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 attached to the vehicle. Disruption of the fire suppression module 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
- Fire suppressors
- Fire suppression 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. NOTE: Make sure to use the latest scan tool software release.
If the cause is not visually evident, connect the scan tool to the data link connector (DLC).
5. NOTE: The vehicle communication module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM.
If the scan tool does not communicate with the VCM:
- Check the VCM connection to the vehicle.
- Check the scan tool connection to the VCM.
- Refer to Information Bus (Module Communications Network), No Power To The Scan Tool, to diagnose no communication with the scan tool.
6. If the scan tool does not communicate with the vehicle:
- Verify the ignition key is in the ON position.
- Verify the scan tool operation with a known good vehicle.
- Refer to Information Bus (Module Communications Network) to diagnose no response from the powertrain control module (PCM).
7. Carry out the network test:
- If the scan tool responds with no communication for one or more modules, refer to Information Bus (Module Communications Network).
- If the network test passes, retrieve and record the continuous memory DTCs.
8. Clear the continuous DTCs and carry out the self-test diagnostics for the fire suppression module.
9. If the DTCs retrieved are related to the concern, go to the Fire Suppression Module Diagnostic Trouble Code (DTC) Index. For all other DTCs, refer to Body Control Systems (Multifunction Electronic Control Module). Diagnostic Trouble Code Tests and Associated Procedures
10. If no DTCs related to the concern are retrieved, GO to Symptom Chart. Symptom Related Diagnostic Procedures