maybe a bad key?
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Senior Member
Joined: Aug 2006
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From: Kentucky
maybe a bad key?
there has been two time that my truck has not started in the in the past two weeks. both times with my wife's key. the first time you crank it it will fire and idle it about 500 rpm for about 2 seconds and die after that it just cranks and no fire. i let it sit for 30 min both times and still nothing. when i let it sit for 2 hour it starts and runs fine. both time it has done it was with my wife's key. do you think it is a bad key? my wife's and my keys are both aftermarket strattec keys but i do have one ford key.
Technical Article Contributor
Joined: Jun 2002
Posts: 10,511
Likes: 10
From: Under the flightpath of old ORD 22R
It is not the PATS key.
The RFID in the key is checked against the list of programmed keys in the HEC in the cluster, to check if it is valid.
If it is valid, the message is sent over the multi comm network to the PCM, to signal a valid key, and proceed as normal ( let the engine start ). After this, the PATS verification is out of the loop.
If the key was having an issue, the symptom would be crank no start, with a flashing theft light. ( it would not get to the running at 500 RPM part ).
If you have a door key cut ( non PATS ), put it in the ignition, and hold a PATS key by the ignition cylinder, the truck would still start and run as normal, until you turn it off.
Have you ever cleaned your IAC ? This is what I would think of for the low idle.
The RFID in the key is checked against the list of programmed keys in the HEC in the cluster, to check if it is valid.
If it is valid, the message is sent over the multi comm network to the PCM, to signal a valid key, and proceed as normal ( let the engine start ). After this, the PATS verification is out of the loop.
If the key was having an issue, the symptom would be crank no start, with a flashing theft light. ( it would not get to the running at 500 RPM part ).
If you have a door key cut ( non PATS ), put it in the ignition, and hold a PATS key by the ignition cylinder, the truck would still start and run as normal, until you turn it off.
Have you ever cleaned your IAC ? This is what I would think of for the low idle.
Thread Starter
|
Senior Member
Joined: Aug 2006
Posts: 584
Likes: 0
From: Kentucky
It is not the PATS key.
The RFID in the key is checked against the list of programmed keys in the HEC in the cluster, to check if it is valid.
If it is valid, the message is sent over the multi comm network to the PCM, to signal a valid key, and proceed as normal ( let the engine start ). After this, the PATS verification is out of the loop.
If the key was having an issue, the symptom would be crank no start, with a flashing theft light. ( it would not get to the running at 500 RPM part ).
If you have a door key cut ( non PATS ), put it in the ignition, and hold a PATS key by the ignition cylinder, the truck would still start and run as normal, until you turn it off.
Have you ever cleaned your IAC ? This is what I would think of for the low idle.
The RFID in the key is checked against the list of programmed keys in the HEC in the cluster, to check if it is valid.
If it is valid, the message is sent over the multi comm network to the PCM, to signal a valid key, and proceed as normal ( let the engine start ). After this, the PATS verification is out of the loop.
If the key was having an issue, the symptom would be crank no start, with a flashing theft light. ( it would not get to the running at 500 RPM part ).
If you have a door key cut ( non PATS ), put it in the ignition, and hold a PATS key by the ignition cylinder, the truck would still start and run as normal, until you turn it off.
Have you ever cleaned your IAC ? This is what I would think of for the low idle.
Last edited by chrism9232; Nov 29, 2009 at 02:33 PM.
Technical Article Contributor
Joined: Jun 2002
Posts: 10,511
Likes: 10
From: Under the flightpath of old ORD 22R
Clean the IAC, and test again.