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Speedometer not functioning?

Tiny
BLESSING EWOBOR
  • MEMBER
  • 2004 NISSAN MAXIMA
  • V6
  • 2WD
  • AUTOMATIC
  • 204,567 MILES
Good morning, sir,
The vehicle speedometer is not functioning, but the transmission is working perfectly (shifting into gears). I thought the transmission should not upshift since the speedometer is not functioning. How can the combination meter be tested to know if the problem is not from the combination meter? Could I get a circuit diagram showing the relationship between transmission, combination meter and ECU?
And what other tests could be done?
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Thursday, October 20th, 2022 AT 7:32 PM

14 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
It does sound like the cluster is no good and you will need to get a rebuilt unit. Here are the wiring diagrams for the speedometer and vehicle speed sensor to the PCM. They call it a revolution sensor. Check out the images (below). Please let us know what you find. We are interested to see what it is.
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Friday, October 21st, 2022 AT 10:27 AM
Tiny
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Thank you very much.
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Friday, October 21st, 2022 AT 4:02 PM
Tiny
KEN L
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You are welcome, let me know what happens.
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Saturday, October 22nd, 2022 AT 1:16 PM
Tiny
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Good morning, sir,

Sir, is there any way for someone to know how the system operates?
For some make, I know that once the speedometer is not functioning the vehicle will not upshift. This information cannot be gotten from the circuit diagram.
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Saturday, October 22nd, 2022 AT 7:59 PM
Tiny
KEN L
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  • 47,643 POSTS
Not really, if the power and grounds are good and there is no code for the VSS then it is pointing to the instruments cluster as the problem.
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Monday, October 24th, 2022 AT 10:50 AM
Tiny
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  • MEMBER
  • 671 POSTS
Good morning, sir,

I am planning to get an oscilloscope, but I don't know if this product has all the requirements for diagnosing automotive problems or if it is good, please I need advice. I am sincerely sorry for posting it here.
Wishing you merry Christmas and new year in advanced.
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Monday, December 19th, 2022 AT 7:12 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
I would not get an oscilloscope for this problem, lets try to replace the VSS sensor instead. Here is the location of the sensor.
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Tuesday, December 20th, 2022 AT 11:10 AM
Tiny
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  • MEMBER
  • 671 POSTS
Good morning, sir,

I want to buy oscilloscope, but I don't know how to select a better one, the image that I posted earlier was one of the types I saw online but I don't know if it is good for the automotive problem. The oscilloscope is not for this problem but I wanted to add it to my tools, that is why I am asking sir.
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Tuesday, December 20th, 2022 AT 7:31 PM
Tiny
KEN L
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I see, sounds good, basically any oscilloscope that can supply a wave form is good for automotive applications.
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Thursday, December 22nd, 2022 AT 2:18 PM
Tiny
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Thank you, sir.
Merry Christmas
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Saturday, December 24th, 2022 AT 6:40 PM
Tiny
KEN L
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Please let us know what happens with the repair.
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Monday, December 26th, 2022 AT 11:10 AM
Tiny
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  • MEMBER
  • 671 POSTS
Good evening, sir,

It has been fixed, one of the wires to the sensor connector was bad.
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Monday, December 26th, 2022 AT 3:58 PM
Tiny
KEN L
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Thanks for letting us know, we are here to help, please use 2CarPros anytime.
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Monday, December 26th, 2022 AT 4:44 PM
Tiny
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Thank you very much, 2CarPros has been of help to me, I really appreciate your patience towards me. Thank you very much once again, forever grateful.
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Tuesday, December 27th, 2022 AT 8:32 AM

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