Codes B1681and B1352, engine cranks but does not start?

TONY423

MEMBER
2000 FORD F-150
5.4L
V8
4WD
AUTOMATIC
250,000 MILES

I have a old truck that the Pat's system has disabled the truck from starting. I have instrument cluster code B1681 and a B1352 code. And help would be appreciated.

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Tuesday, September 26th, 2023 AT 5:11 PM

6 Replies

JACOBANDNICKOLAS

MECHANIC
108,269 POSTS

Hi,

The B1352 isn't listed for this vehicle, but I know it is a Ford code specific to the Ignition key in circuit failure and focuses more on the door chime. So, I don't (at this point) feel that is causing a no-start condition.

On the other hand, the B1681 is specific to the PATS. This will prevent the engine from starting. The code can be caused by a loss of power to the transceiver, a loss of a ground path, or a faulty PATS transceiver.

I attached the diagnostics below for the B1681. Take a look through them and let me know if you are comfortable performing them.

Take care and let me know if you have questions.

Joe

See pics below.

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Tuesday, September 26th, 2023 AT 7:29 PM

TONY423

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12 POSTS

Thank you Joe! This is exactly the response I needed. I will post updates and questions if I have any.

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Wednesday, September 27th, 2023 AT 11:29 AM

TONY423

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12 POSTS

Okay, seems to be a problem on circuit 1216 voltage is 2.7v and resistance is OL.

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Wednesday, September 27th, 2023 AT 3:36 PM

JACOBANDNICKOLAS

MECHANIC
108,269 POSTS

Hi,

It sounds like a broken wire. The OL (open line) may be a bit difficult to find. Take sections of the wire and keep checking for resistance until you find continuity.

Let me know.

Joe

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Wednesday, September 27th, 2023 AT 8:13 PM

TONY423

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I'm doing continuing testing on sections on that circuit and will let you know the results. Thanks again! And I was wondering, this is an old truck with lots of miles. I've read there's a way to disable PAT'S through a binary file within the PCU under the Vehicle ID block. I have a Topdon Artidiag Pro scan tool with bi directional capabilities and online CPU coding and also have access to an IDS. So my question is, what file or wording would I be looking for and what parameters would need to be changed to disable the PAT'S so the PCU would simply ignore the PAT'S and allow the Vehicle to start?