Speedometer not functioning?

2004 NISSAN MAXIMA
204,567 MILES • V6 • 2WD • AUTOMATIC
Avatar
BLESSING EWOBOR
  • MEMBER
  • 753 POSTS
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?
Oct 20, 2022 at 7:32 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
STRAILER
  • CAR REPAIR CONTRIBUTOR
  • 54,189 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.

Images (Click to enlarge)
Attached Media
Attached Media
Attached Media
Attached Media
Attached Media
Attached Media
Attached Media
Oct 21, 2022 at 10:27 AM
Advertisement
Avatar
BLESSING EWOBOR
  • MEMBER
  • 753 POSTS
Thank you very much.
Oct 21, 2022 at 4:02 PM
Avatar
STRAILER
  • CAR REPAIR CONTRIBUTOR
  • 54,189 POSTS
You are welcome, let me know what happens.
Oct 22, 2022 at 1:16 PM
Avatar
BLESSING EWOBOR
  • MEMBER
  • 753 POSTS
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.
Oct 22, 2022 at 7:59 PM
Avatar
STRAILER
  • CAR REPAIR CONTRIBUTOR
  • 54,189 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.
Oct 24, 2022 at 10:50 AM
Avatar
BLESSING EWOBOR
  • MEMBER
  • 753 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.
Image (Click to enlarge)
Attached Media
Dec 19, 2022 at 7:12 PM
Avatar
STRAILER
  • CAR REPAIR CONTRIBUTOR
  • 54,189 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.
Image (Click to enlarge)
Attached Media
Dec 20, 2022 at 11:10 AM
Avatar
BLESSING EWOBOR
  • MEMBER
  • 753 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.
Dec 20, 2022 at 7:31 PM
Avatar
STRAILER
  • CAR REPAIR CONTRIBUTOR
  • 54,189 POSTS
I see, sounds good, basically any oscilloscope that can supply a wave form is good for automotive applications.
Dec 22, 2022 at 2:18 PM
Avatar
BLESSING EWOBOR
  • MEMBER
  • 753 POSTS
Thank you, sir.
Merry Christmas
Dec 24, 2022 at 6:40 PM
Avatar
STRAILER
  • CAR REPAIR CONTRIBUTOR
  • 54,189 POSTS
Please let us know what happens with the repair.
Dec 26, 2022 at 11:10 AM
Avatar
BLESSING EWOBOR
  • MEMBER
  • 753 POSTS
Good evening, sir,

It has been fixed, one of the wires to the sensor connector was bad.
Dec 26, 2022 at 3:58 PM
Avatar
STRAILER
  • CAR REPAIR CONTRIBUTOR
  • 54,189 POSTS
Thanks for letting us know, we are here to help, please use 2CarPros anytime.
Dec 26, 2022 at 4:44 PM
Avatar
BLESSING EWOBOR
  • MEMBER
  • 753 POSTS
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.
Dec 27, 2022 at 8:32 AM