PFQ (ABAP) - ABAP System not available (PFQ (ABAP))
Root cause: 
The ABAP system PFQ did not respond to availability checks, as indicated by the alert details. The specific components that failed to respond were not explicitly identified in the provided incident details.  
 
Resolution steps: 
All the Instances are active in SM51. 
Manually checked the HTTP availability in SMICM and the port is active.