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Limp mode

Tiny
AUSTINO
  • MEMBER
  • 2003 JAGUAR S-TYPE
  • 3.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 67,000 MILES
Good evening, can you please send me a labelled diagram showing where all the ECU sensors are located?Thank you in advance!
Wednesday, November 28th, 2018 AT 6:12 PM

16 Replies

Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I am Danny,

Just a quick question first. What sensors are you looking for? I can provide a diagram but I am wondering if you are looking for something specific. The ECU is a computer that controls the engine. Thanks for using 2CarPros.
Danny-
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Wednesday, November 28th, 2018 AT 7:26 PM
Tiny
AUSTINO
  • MEMBER
  • 211 POSTS
Thank you, I am not looking for anything specific. So you can provide me with the diagram? Thanks Danny.
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Thursday, November 29th, 2018 AT 12:55 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Unfortunately they do not list the sensor locations together, you will need to be specific.
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Thursday, November 29th, 2018 AT 1:57 PM
Tiny
AUSTINO
  • MEMBER
  • 211 POSTS
Good evening, okay thanks. Can you send the ECU sensor that allows the car to accelerate? Because the car is just throttling but it is not revving out. Thanks in advance.
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Thursday, November 29th, 2018 AT 4:26 PM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.
It sounds like you are having a problem with the APPS (Accelerator Pedal Position Sensor). The sensor is located above the gas pedal and its function is as a Potentiometer. It is a fly-by-wire system using an electrical connection instead of a throttle cable style linkage. Hope this helps and feel free to ask questions if needed. Thanks again for using 2CarPros.
Danny-
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Thursday, November 29th, 2018 AT 7:42 PM
Tiny
KEN L
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  • 48,363 POSTS
This can also take place if the throttle bore is dirty, puts the car in limp mode. Disconnect the battery and follow this guide then clear the codes.

https://www.2carpros.com/articles/throttle-actuator-service

Please run down this guide and report back.

Cheers, Ken

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Friday, November 30th, 2018 AT 10:45 AM
Tiny
AUSTINO
  • MEMBER
  • 211 POSTS
Thank you very much. I will let you know what happens.
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Saturday, December 1st, 2018 AT 5:57 AM
Tiny
AUSTINO
  • MEMBER
  • 211 POSTS
Good morning, do you know how to test the APPS in order to know if it has really gone? Thank you
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Saturday, December 1st, 2018 AT 8:45 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
You can use a voltmeter to watch the ohms sweep, to tough part is watching for any "noise" the sensor might have which shuts down the PCM into limp mode. The APPS go out all the time. Did you service the throttle bore?
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Saturday, December 1st, 2018 AT 11:36 AM
Tiny
AUSTINO
  • MEMBER
  • 211 POSTS
Thanks.
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Saturday, December 1st, 2018 AT 11:38 AM
Tiny
AUSTINO
  • MEMBER
  • 211 POSTS
Hello, good morning. Can you please send me an image showing the ECU wiring diagram for my Jaguar 2003
S type car? Thanks in advance.
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Monday, December 3rd, 2018 AT 4:26 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Sure, here is the engine wiring diagrams showing the ECM and a guide to help you check the connections:

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (below). Please let us know what you find.

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Monday, December 3rd, 2018 AT 6:39 PM
Tiny
AUSTINO
  • MEMBER
  • 211 POSTS
Thank you. Only the text is a bit not readable. Can you please make it clear if possible. Thank you Ken as always your so helpful sir.
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Tuesday, December 4th, 2018 AT 6:04 PM
Tiny
AUSTINO
  • MEMBER
  • 211 POSTS
I must apologize, I got the text to be readable by zooming. Thank you so much Ken.
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Tuesday, December 4th, 2018 AT 7:51 PM
Tiny
KEN L
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Okay good, let me know what you find.
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Wednesday, December 5th, 2018 AT 10:59 AM
Tiny
AUSTINO
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  • 211 POSTS
Okay I will.
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Wednesday, December 5th, 2018 AT 2:06 PM

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