Look up the Pakistani Jeep forum.
Member Institute of Automotive Mechanical Engineers [Ret], ASE Master Medium/Heavy Truck & Auto Technician USA -2002 Licensed Motor Mechanic NSW MVIC 49593....Current
TO DIAGNOSE, TROUBLESHOOT OR FAULT FIND ANY AUTO SYSTEM....
One needs a basic understanding of how system parts interact with one another. GOOD parts can then be systematically established & the NOT GOOD problem/s part/s isolated for repair or replacement.