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Well maxiiiboy? Speedo quit working, 2001 Maxima, Doesn't Have Speed Sensor
So a few days ago, made my first post here looking for info. 2001 max, speedo not working, code P0500.
Asking cause there WAS some confusion over if this car had a speed sensor in the tranny or used the ABS sensor. Well maxiboy berated me basically saying of course dumbass just replace it. Well it don't, so thanks a lot for that.
But more to the point, I didn't get around to changing the sensor today, probably tomorrow. However I'm a bit concerned, if the ABS sensor was bad you'd think I'd have ABS problems, I don't. I haven't tried to lock the brakes or anything but there's no ABS light on, they aren't acting up, etc.
Well it's clear now that I'm going to have to dig into this further, fun.
So the speedometer, odometer, and cruise aren't working, all else is still fine. This and the above cross my fingers fixes not working tells me either the combination meter speedo/gauge has an issue or there's an electrical fault between the ABS control unit and the combination meter. Best guess would be the later, given that the speedo functions are the only part of the combination meter not working.
I'm not looking forward to digging into it looking for a problem in either one of these. Nor do I have much in the way of electrical diagnostic tools just a basic ODB reader and a DVOM. Is there anything that is common? What is this gauge test, I can't think of any easy way to test the combination meter?
The FSM on this site which is BTW so far the best I've found shows error when clicking the bookmark to the super multiple junction, anyone have better info on this?
I haven't found anything useful on the cruise control yet, is cruise a function within the ECM or a separate unit? I'm just considering that if it's a separate unit, it not working may be an indicator of where the fault is.
Similar with the odometer, and trip meter, they're just a readout from the ECM correct? Or are trip meter functions in the combination meter? Trip and odometer still read out but do not change. Can any info be gained from that? Likely I would think this to indicate that the combination meter is fine, it just lacks a speed signal thus isn't sending a speed signal to the ECM.
Well cruise is a 01/02 change as well, but looks like mine is 02 style, vacuum and a separate control unit. While 02 is electric and controlled by the ECM. Both versions get the speed signal from the speedo, just from different pins. How this meshes with mine not having a VSS and using the ABS instead I'm not sure yet.
However it doesn't seem to mater, working theory is still no input to speedo = no output from speedo.
1995 through 2001 engines used wire to control the throttle. These cars had a separate control module for the speed control and a vacuum diaphragm to operate the throttle. The speed signal comes from the transmission.
2002 and later use an electrically controlled throttle. These cars have the cruise control built into the ECU and the ECU operates the throttle . The speed signal comes from the ABS unit.
Both these systems work similarly in that a speed signal is sent to the speedometer and the speedometer relays the speed signal to whatever controls the cruise control. No speed signal, no cruise control.
Since your transmission doesn't have a VSS, then look at your throttle and see if it is electricall operated. Going on the assumption that your car is the 2002 style, then run the self diagnostic on the ABS unit and see if it returns any errors.
Since your transmission doesn't have a VSS, then look at your throttle and see if it is electricall operated. Going on the assumption that your car is the 2002 style, then run the self diagnostic on the ABS unit and see if it returns any errors.
I looked last night before the last post. The cruise is vacuum not electric, but I have no VSS, so bit of both worlds. Presumably cause vacuum I still have an ASCD unit.
The only variation that appears to matter in this regard is that the ECU version and ASCD version use different pins on the Combination Meter to get there speed signal from.
I'm not a big stock modern tech guy, what's an ABS self diagnostic, how do I do that? I had simply been assuming that had there been any errors an ABS light would be flashing at me.
It's going to be a while till I can find the time to really dig into the car, I can't have it down for long. Trying to learn as much as possible before I do, given that at the moment it's just an instrumentation issue.
A self diagnostic is a test that is built into the unit. There are several self diagnostics for various parts of the car.
For the ABS, the procedure is in the BR (Brakes) section. It is best to use the second edition of the 2000 FSM because it has a more complete listing of error codes.
A self diagnostic is a test that is built into the unit. There are several self diagnostics for various parts of the car.
For the ABS, the procedure is in the BR (Brakes) section. It is best to use the second edition of the 2000 FSM because it has a more complete listing of error codes.
So check this out, yesterday morning I did the gauge test that Child uv Korn suggested. Then some time later, after some time driving, the gauge started working again.
I think your speedometer is defective and it's not sending the speed signal from the ABS on to the cruise. This could of course also be the wiring between the ABS and the speedo, or something related.
I think your speedometer is defective and it's not sending the speed signal from the ABS on to the cruise. This could of course also be the wiring between the ABS and the speedo, or something related.
I had this problem earlier this year replaced both sensors and it actually turned out to be gauge cluster. Replaced and never had a problem.
I think your speedometer is defective and it's not sending the speed signal from the ABS on to the cruise. This could of course also be the wiring between the ABS and the speedo, or something related.
So it started working again tonight, I'm thinking it might be temperature related. It's started working again twice and both times were on long night drives where the defrost was on high. This tends to heat the dash and area behind it.
So looking more towards taking the dash apart to check and tighten.
11-23-2016, 05:55 PM
