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PCM relay power problem

Tiny
J PHILLIPS
  • MEMBER
  • 1998 LINCOLN TOWN CAR
  • 4.6L
  • 110,000 MILES
PCM relay not activating. Relay is good. Will not start, only cranks over no ignition. Jumped PCM relay and started fine and ran great. No activation voltage to relay.
Monday, January 14th, 2019 AT 3:50 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

I attached a wiring diagram for you to view.

You jumped pins 30 and 87 for it to run.

You need to check for power on pin 86. If you have power, then you need to check 85 for ground.

The PCM grounds the relay to allow power to the ignition system.

Roy
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Tuesday, January 15th, 2019 AT 3:37 AM

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