Won't Start and Theft light is on

LORIANDWILLIE

MEMBER
1998 FORD EXPEDITION
V8
4WD
AUTOMATIC
170,000 MILES

My expedition had a miss. My husband changed the plugs and wires. It was running fine and he got ready to go to the store and it just died. He checked the fuel pump relay in the fuse box it was fine. He checked the fuel pump and there is no power going to it.
The theft light is now on. Can anyone give me any advice please

1 Reply

DAVE H

MECHANIC
13,383 POSTS

Passive anti-theft system uses PCM to enable or disable vehicle's engine. Within one second after engine start, PCM must receive an enable signal or the engine will be disabled.
When system is functioning properly and ignition switch is turned to RUN or START position, THEFT indicator light will turn on for 2 seconds, then turn off. Vehicle will be enabled to start and run.
If THEFT indicator light is on continuously for 2 seconds then flashes for one minute, followed by Diagnostic Trouble Code (DTC) 16 that flashed 10 times, key code has been received but there is no PCM verification. If vehicle starts, PCM is not communicating with PATS module. If vehicle does not start, Multiplex Communications Network (MCN) may be faulty. Go to SELF-DIAGNOSTIC SYSTEM.
If THEFT indicator flashes for one minute, no key code was received. This is due to a damaged key, a non-encoded key, faulty wiring or PATS module fault.
If THEFT indicator flashes for 15 minutes. Key code received is invalid. Vehicle has been disabled due to key not being programmed. See KEY INITIALIZATION under SERVICE PROCEDURES.