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Technicaldan
Technicaldan, Technician
Category: Nissan
Satisfied Customers: 104
Experience:  Accredited
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I bought an 04 Nissan with a bad crash sensor and so it had

Customer Question

I bought an 04 Nissan with a bad crash sensor and so it had vdc,abs, etc lights on but still ran and drove fine. After letting the truck idle for about 20 min one day I noticed my speedometer wasn't working. I had a front left wheel bearing go bad and thought that speed sensor was the culprit. I've sense replaced it but still no speedometer. Neither the dash digital speedo work nor an obd2 scan tool hooked up to it read any speed. I checked for voltage at the front left speed sensor plug and do not have any on either wire. I currently have a p0500 cel code. I'm starting to think abs module could be the culprit. Any suggestions?
Submitted: 3 months ago.
Category: Nissan
Expert:  Technicaldan replied 3 months ago.

Hi, i'm Danny, I hope you are well.

From memory, these use the abs sensors to calculate the speed from the wheels and this information is used for the speedometer, etc, as you have already said yourself.

When testing abs wheel sensors and other similar sensors, a oscilloscope is needed, not a multimeter, the signal is effectively a square wave signal, not a increasing or decreasing voltage.

P0500 is vehicle speed sensor fault, in the case transmission based speed sensors. In this case, it can be lack of communication to the abs module or lack of signal from the abs module, again, as you have already suspected yourself.

My concern is that the cost and effort to replace the abs module are reasonably high, with no actual proof as yet, I wonder if you are able to get to a local Autozone or similar and have the codes scanned, with a unit that is capable of reading all the modules in the car, i.e., the ecu, abs and dash, as opposed to a cheap obd reader that can only read basic ecu fault codes.

I would then suggest you report back with the information and dtc's obtained.