The Honda PCX / Forza / ADV150 / SH Forums

Someone tried to steal my scooter (2013 PCX 150), ended up tearing apart some wiring in the process so I went in and rewired the severed wires. All was connected back together but the bike didn't start... Weird. I rechecked all the wiring, even the sidestand switch was showing continuity between the Green/White and Blue/Green wires going into the ECM. But still just nothing. I would turn the key to on, the engine light would come on, but shut off shortly afterward. No clicking from the starter, but checked the battery and starter relay, both were good. Figured I'd try one more time through the checklist. I'm hoping someone can explain what's wrong because the wiring diagram and other posts don't make it obvious.

Number 4 in the troubleshooting (6-5), "Sidestand Inspection". Checks for continuity between the green/white wire and ground. This is where I missed it. Originally I had used a simple continuity checker (i.e. light-up tester) and the light came on dimly, so I figured there was continuity. But the second time around I used a multitester that showed about 1350 (ohms?) instead of 0. Just for test, I jumpered the green/white wire to ground and the scooter fired right up but disabling the sidestand safety.

What confuses me is that I have continuity between the two wires, but no ground connection. So many of the sidestand-switch bypass articles talk about just connecting the two wires, but wouldn't that disable the ground also? Where is the green/white wire supposed to be grounded?

Any help would be greatly appreciated. I ordered a new (used) sidestand switch, but I'm not 100% sure that's going to fix it.

Sound like you have poor grounding in general, at least to the side stand switch. From the circuit diagram, which you seem to have or can find, one of the ground wires runs to pin 14 of the ECM and that also feeds through to the ground connection of the side stand switch. If you ground the other wire and it fires up, and you have 1.3K ohms for the ground connection, that's your problem.
I'd check all the ground connections from where they go to to battery earth is very low impedance (ohms) and that the ground block to the chassis is solid (also check the battery ground is near zero to the chassis.

I do have the circuit diagram, but as far as I can see it doesn't show a ground to pin 14, it's only the Blue/Green wire which connects to many things - including one of the wires in the sidestand switch. I don't see that it connects anywhere to ground for the 13 model. That's why I'm confused, I don't actually see which wire connects to ground and where. Is it at the sidestand switch itself?

Have you checked the left brake lever starter activation switch and wiring?

rh4444 wrote:I do have the circuit diagram, but as far as I can see it doesn't show a ground to pin 14, it's only the Blue/Green wire which connects to many things - including one of the wires in the sidestand switch. I don't see that it connects anywhere to ground for the 13 model. That's why I'm confused, I don't actually see which wire connects to ground and where. Is it at the sidestand switch itself?

Not sure what size bike you have (125/150) or where you are located, but I had a look at a 125 and 150 circuit diagram for a 'bulb' model, so definitely not a new style LED UK version of a 125, and on both it shows the blue ground wire from the switch going to a main ground but also spurring off to pin 14 of the ECU - however, for the bike to start that should be ok, I'd still worry about any ground wire having anything but fractions of an ohm (or very low resistance) to battery ground.

I think where I'm confused is that I even though I see the blue/green wire going everywhere, I don't actually see it connected to ground on the circuit diagram, it just goes all over the place. I have a 2013 PCX 150 in the US (MN). The step-by-step troubleshooting steps also have me checking the green/white wire for ground, not the blue/green wire. I just wish I knew how that wire was grounded - if it's through the switch from the blue/green, fine, I just don't see where it connects. Sorry, it's all a bit confusing to me.