2012 ST Cranks but wont start... Diag Video Inside - Triumph675.Net Forums
 
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post #1 of 7 Old 03-03-20, 05:33 Thread Starter
Gary Bagley
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Unhappy 2012 ST Cranks but wont start... Diag Video Inside

Hello all, I have a 2012 ST and it just will not start. The battery is bad, as in the voltage has tested to be low (6-7v when cold) but I am currently using a jump pack to crank over, this is likely due to the bike having sat for the entire winter, but the issue occurred before this. I tried getting on one day and the bike fired up, but then it died some 20-30s after turning on. I tried restarting it, but it just cranked and cranked away. Fast forward to now, some 3 months or so later, and still not sure what the issue is.

Ive linked a video with the diagnostic steps I have taken, but suffice it to say, I believe the CPS, STATOR and R/R are all good based on my measurements.

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post #2 of 7 Old 03-04-20, 00:11
MacBandit
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Most likely the CPS. They frequently test good but fail under load.
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post #3 of 7 Old 03-04-20, 11:13 Thread Starter
Gary Bagley
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Originally Posted by MacBandit View Post
Most likely the CPS. They frequently test good but fail under load.
Interesting... Do you know of any other tests to run on it to really nail down that its the CPS? I dont wanna buy parts and just throw em at it ya know?
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post #4 of 7 Old 03-04-20, 11:19
Stephen Pilsworth
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Bump start it, if it fires it's the CPS sensor.

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post #5 of 7 Old 03-04-20, 11:20 Thread Starter
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Quote:
Originally Posted by Stephen Pilsworth View Post
Bump start it, if it fires it's the CPS sensor.

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Doesnt the ECU/Ignition get a signal from the CPS to tell it when to spark? If so, how would bump starting it bypass this?
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post #6 of 7 Old 03-04-20, 12:23
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Doesnt the ECU/Ignition get a signal from the CPS to tell it when to spark? If so, how would bump starting it bypass this?
It does, but you're skipping that by having the wheel turning to fire it up. It's a proven way to test if you're not sure on the readings coming out the CPS

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post #7 of 7 Old 03-04-20, 13:37 Thread Starter
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Quote:
Originally Posted by Stephen Pilsworth View Post
It does, but you're skipping that by having the wheel turning to fire it up. It's a proven way to test if you're not sure on the readings coming out the CPS

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Okay, but how would the engine stay running via bump start if it needs the CPS signal to do spark? That's the part that has me confused. Not saying I wont try it, and I actually spotted this suggestion elsewhere on the triumphrat forums here: https://www.triumphrat.net/threads/s...-starts.869354
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