Speed Sensor question - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Carbonsnail · 06-22-2023, 03:11 PM

I have a manual 1992 S13 whose speedometer works but the odometer does not. Will a new speed sensor fix this problem? Thank you in advance.

AKADriver · 06-22-2023, 07:25 PM

No, the speed sensor drives both and if it were bad they would both be dead.

This is a mechanical failure in the odometer drive, there's a stepper motor which drives some nylon gears, the gears can slip out of line and get stripped.

https://imgur.com/a/kgCLBOO

You can see the stripped gear here, it's the one driven by the worm gear on the stepper motor.

In mine I moved the gear back into place, used a dab of CA glue to try to keep it from sliding sideways on the shaft again, used a small pick to re-form the gear teeth a bit, then added a fresh drop of 3in1 oil. It's been working fine since!

Carbonsnail · 06-23-2023, 06:46 PM

@AKADriver: Thank you very much for taking the time and effort. Your info and photo greatly helped me, and I may decide to forego removing the panel and trying to fix it. Thanks again,
have a great summer.

06-22-2023, 03:11 PM	#1
Carbonsnail Join Date: Aug 2020 Location: Lancaster CA Age: 61 Posts: 34 Trader Rating: (0) Feedback Score: 0 reviews	Speed Sensor question I have a manual 1992 S13 whose speedometer works but the odometer does not. Will a new speed sensor fix this problem? Thank you in advance.

06-22-2023, 07:25 PM	#2
AKADriver Post Whore! Join Date: May 2002 Location: Springfield, VA Age: 42 Posts: 3,475 Trader Rating: (1) Feedback Score: 1 reviews	No, the speed sensor drives both and if it were bad they would both be dead. This is a mechanical failure in the odometer drive, there's a stepper motor which drives some nylon gears, the gears can slip out of line and get stripped. https://imgur.com/a/kgCLBOO You can see the stripped gear here, it's the one driven by the worm gear on the stepper motor. In mine I moved the gear back into place, used a dab of CA glue to try to keep it from sliding sideways on the shaft again, used a small pick to re-form the gear teeth a bit, then added a fresh drop of 3in1 oil. It's been working fine since! Last edited by AKADriver; 06-22-2023 at 08:03 PM..

06-23-2023, 06:46 PM	#3
Carbonsnail Join Date: Aug 2020 Location: Lancaster CA Age: 61 Posts: 34 Trader Rating: (0) Feedback Score: 0 reviews	@AKADriver: Thank you very much for taking the time and effort. Your info and photo greatly helped me, and I may decide to forego removing the panel and trying to fix it. Thanks again, have a great summer.