The Honda PCX / Honda Forza / SH Forums

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PostPosted: Mon Feb 12, 2018 3:56 pm 
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Joined: Mon Feb 12, 2018 3:46 pm
Posts: 3
Year: 2016
Color: black
hi people I'm new here,
i have a 2016 pcx 125 it just stopped running yesterday as i was riding along. i got it taken home and have had a look today. its got a spark and the fuel pump primes but then the spark goes and the fuel stops pumping.

i have removed the fuel pump and that runs and works. now when I'm cranking the engine i have no earth to the fuel pump the power side is fine, checked all the fuses and easy things.

does this bike have a crank shaft sensor? thanks kevin


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PostPosted: Mon Feb 12, 2018 4:52 pm 
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Joined: Tue May 23, 2017 3:37 pm
Posts: 29
Location: Birmingham,uk
Year: 2016
Color: Red
That is a pain. You say checked easy things, have you checked the battery. My thoughts were battery or alternator. Hoping it is the battery or something else simple


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PostPosted: Mon Feb 12, 2018 5:52 pm 
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Joined: Sat Nov 05, 2016 2:03 pm
Posts: 234
Location: northern ontario
Year: Forza 300
Color: red/2014
Like other FI Hondas, it should have a Crank Position Sensor (Forza's is 110 ohms, 1.6 Vac @ cranking
speed, easy to check with a multitester). They're all +/- built the same, so should have similar specs.

With this sensor defective, there's no spark, no fuel injection (yet it may work for a few seconds
before giving up). Initial pump action is pre-programmed in the ECU and lasts about 2 secs. You'd
need a wiring diagram to see clear through this, but it's fairly easy to locate the sensor's wiring
and test it.


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PostPosted: Mon Feb 12, 2018 8:36 pm 
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Joined: Sat Nov 05, 2016 2:03 pm
Posts: 234
Location: northern ontario
Year: Forza 300
Color: red/2014
UPDATE

If it has the Stop/Start system, its Crank Pos. Sensor is one complicated, multi-wire gimmick,
much more sophisticated in operation (just had a look at the corresponding diagram, available
online by googling 'pcx 125 wiring diagram'. Looks like this thing can't be tested without a
factory shop manual...

Does it show any fault code ?


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PostPosted: Tue Feb 13, 2018 1:42 am 
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Joined: Mon Feb 12, 2018 3:46 pm
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Year: 2016
Color: black
On the fault codes im getting one long blink then to fast ones after it. Yes i would say it has stop start. So is the prankshaft sensor apart of the start motor charging system system?


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PostPosted: Tue Feb 13, 2018 2:00 am 
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Joined: Mon Feb 12, 2018 3:46 pm
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Year: 2016
Color: black
Is there anyway i can do a diagnostics check on this bike where is the connector


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PostPosted: Tue Feb 13, 2018 7:11 am 
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Joined: Sat Nov 05, 2016 2:03 pm
Posts: 234
Location: northern ontario
Year: Forza 300
Color: red/2014
Fault code #12 refers to INJECTOR, on both Hondas I own ( Giorno + Forza ).

- ECU can't diagnose a fuel pump problem.
- CKP problem may or may not have a code #, depending on year/model. If not, shop manual should
indicate resistance/Vac output specs.

You need a shop manual, or a competent dealer...


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PostPosted: Tue Feb 13, 2018 11:11 am 
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Joined: Sat Aug 26, 2017 7:28 am
Posts: 23
Location: Venray, the netherlands
Year: 2014
Color: Pearl white
Hi,

According to the workshop manual you're having a fuel injector circuit malfunction, for troubleshooting send me a PM ;)


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PostPosted: Tue Feb 13, 2018 1:15 pm 
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Joined: Mon Nov 07, 2011 11:15 pm
Posts: 6729
Location: L o n g Island NY
Year: 2015 PCX 150esp
Color: Pearl *White*
Howdy kevgam, welcome aboard! :) Glad our mechanical tooling members have come along to help you get things sorted. I'd also try to get my hands on a shop manual - they are invaluable - best tool in the house!

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