Honda PCX Scooter Speedo not moving + Engine light on

[leo182]

Hi,

My speedo is not moving and I've got a amber engine warning light on any ideas?

Bike seems to run ok other than that and when you turn the ignition on the speedo does a 'sweep'


Thanks.

[leo182]

Anyone any ideas at all?

[FSEngineer]

From the symptoms you mention my money would be on the speed sensor or associated wiring - someone seems to have had a similar issue here:

https://www.hondapcx.org/viewtopic.php?f=19&t=...

[leo182]

FSEngineer said:

From the symptoms you mention my money would be on the speed sensor or associated wiring - someone seems to have had a similar issue here:

https://www.hondapcx.org/viewtopic.php?f=19&t=...

Thanks pal, looks like it could be that don't suppose there is a way to test it with say a multimeter?

[Charlie Croker mk2]

Some so called engineers just guess and throw parts at the problem , but reading up it is a known fault in the wiring from the speed sensor around / under the swing arm . I fit was mine i would test for power and ground at the sensor only after I had carefully inspected / wiggled al the wiring .

[FSEngineer]

Charlie Croker mk2 said:

Some so called engineers just guess and throw parts at the problem

But some do a bit of reading around first and draw the same conclusions as people who purport to know better

[FSEngineer]

leo182 said:

Thanks pal, looks like it could be that don't suppose there is a way to test it with say a multimeter?

Looks from this diagram like it'll have 3 wires:

https://www.hondapcx.org/viewtopic.php?f=15&t=...

Pink/Green being signal to the clocks, Black/White ignition live, Green/Orange going to the ECM - apparently feedback for things like the start/stop system (who heard of one of those on a bike?!).

From your issues I'd expect it's likely a break in the black/white ignition live wire (because the ECM light is on as well as the speedo not working). Simple check for that is whether it reads +12v with the ignition on. The other two wires would be a bit more complicated and probably not too easy to diagnose without a scope and some knowledge of the sort of signals the sensor puts out.

Like Charlie ^ says, if there's a known rub/failure point for the wiring I'd be looking there first - might be that a small repair can avoid you shelling out on a new sensor for it not to fix the problem.

[leo182]

Thanks guys for that, that is very helpful.

I'll check the wiring before a pull the trigger on a new sensor... so nearly did!