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Frequent problems in Ford. Lack of crank, car is dead. Immobiliser diode is flashing rapidly and no “milage” digits displayed. After 1 minute diode is flashing code 16 (PATS 16 error code). It can be faulty IC cluster, but on the road it is not possible to fix it. You can check few basic things to eliminate IC cluster issue.
1. Check the fuse
2. Check resistance on OBD pins 6 & 14
- 60 Ohms - is correct value
- 120 Ohms - CAN bus connection is broken somewhere. But most likely your IC Cluster is OK!
3. Check E9 socket in engine fuse box
4. Check all sockets in the fuse box in passenger footwell
5. As last resort check sockets c112 & c113 close to the passenger’s door

Even when the sockets look clean and there are no obvious signs of corrosion, it is still very likelly that there is weak contact.

Use some penetrating contact cleaner and try several times to disconnect and reconnect. Those electrical gremlins are really annoying and challenging to fix.

Good luck.