Stalled then no crank

2005 FORD TAURUS
234,000 MILES • 3.0L • V6 • 2WD • AUTOMATIC
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JMAN74
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Okay. Question, is the TN/RD wire suppose to have volts if the harness is not plugged into the TRS?
Nov 25, 2018 at 11:23 AM
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JMAN74
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Meaning I have 8+ volts no matter if the harness is attached or not on the TRS.
Nov 25, 2018 at 11:32 AM
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ASEMASTER6371
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Okay, that is a problem.


That tells me there is no voltage going through the switch.

Roy
Nov 25, 2018 at 11:42 AM
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JMAN74
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If the harness is not attached then where is the 8+ volts coming from on the TN/RD wire?
Nov 25, 2018 at 11:45 AM
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ASEMASTER6371
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The PCM but do not worry about that. You need voltage from the TRS.

Roy
Nov 25, 2018 at 11:53 AM
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JMAN74
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Ah, okay. So get a new TRS?
Nov 25, 2018 at 11:55 AM
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ASEMASTER6371
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That is where I would start, yes.

Roy
Nov 25, 2018 at 11:56 AM
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JMAN74
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Okay, I will order one today.
On a side note; I plugged the old TRS back in just to see if they both had same issue.
The old one has 8+ volts on the BN/PK input wire after plugging it in. So it too is bad. lol
Nov 25, 2018 at 12:15 PM
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JMAN74
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Okay, call me stupid or crazy or maybe I just did not have my leads connected correctly but after putting the second (newer) TRS back in, I decided to ensure I had it adjusted perfectly with the pre-marked lines for being in neutral. Then re-tested volts at start. I now have matching 12+ volts on both the input and output at the TRS. Additionally I decided to see if it was making to PIN 85 on the relay. It does. So all three points match.
Nov 25, 2018 at 12:30 PM
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JMAN74
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Not sure what the next step would be, lol.
Nov 25, 2018 at 12:34 PM
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ASEMASTER6371
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Hood deal.

Now, does it crank?

Roy
Nov 25, 2018 at 12:34 PM
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JMAN74
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Nope. :(
Nov 25, 2018 at 12:36 PM
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ASEMASTER6371
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Does the relay click?

Is the security light on?

Roy
Nov 25, 2018 at 12:39 PM
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JMAN74
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Relay does not click. Checked PIN86 for ground signal on start but it stays at 8+ volts.
Security light goes off when I turn the key to "on" position.
Nov 25, 2018 at 1:07 PM
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ASEMASTER6371
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The PCM is not grounding it.

From here you need a scan tool to see what the PCM sees. You would be able to see the gear that the PCM sees. If it is reading correct, the PCM may be the issue.

Is there any codes now?

Roy
Nov 25, 2018 at 1:12 PM
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JMAN74
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I will have to wait until tomorrow when I can get my hands on a scan tool. I will update you then. Thank you Roy! Things are beginning to look up! :)
Nov 25, 2018 at 1:14 PM
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ASEMASTER6371
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Good deal.

Keep us updated.

Roy
Nov 27, 2018 at 6:52 AM