It’s been a while but even though there isn’t yet a positive conclusion I thought I’d give an update for the interest of those who have given advice and are interested.
I bought a bunch of cheap pin removal tools off eBay, found the one I needed which was basically just a thin strip to poke down the side of the pins and which in theory should have pushed back the plastic locking catch and released the pin. I couldn’t release the pins! I was reluctant to push really hard on the tool or pull too hard on the wire in case I did irreversible damage. In the end I gave up, put everything back together and with the fault now permanently there took the bike off the road.
The other day I generated enough enthusiasm to strip the bike down and access the IACV on the throttle body. I disconnected and reconnected the 4 pin plug and the fault went!! It has remained off so far since. The logical conclusion is now that the problem lies at the IACV end rather than the ECU end which seemed the logical conclusion earlier. As the saying goes “it’s doing me ‘ead in”
I’ve removed the IACV and it seems to be ok. Its clean and the motor spins as it should. My understanding of how the IACV works is that one pair of the 4 wires from the ECU drives the IACV piston all the way down and covers an airway to the throttle body. The second pair of wires then drives the piston back an amount depending on the temperature of the engine. Is this an accurate description of operation?
I also assume that the ECU only returns an error for an electrical problem. If the IACV piston was sticking for some reason the ECU wouldn’t return error although the bike may not idle correctly. Is that too an accurate assessment?
I will persevere!
I bought a bunch of cheap pin removal tools off eBay, found the one I needed which was basically just a thin strip to poke down the side of the pins and which in theory should have pushed back the plastic locking catch and released the pin. I couldn’t release the pins! I was reluctant to push really hard on the tool or pull too hard on the wire in case I did irreversible damage. In the end I gave up, put everything back together and with the fault now permanently there took the bike off the road.
The other day I generated enough enthusiasm to strip the bike down and access the IACV on the throttle body. I disconnected and reconnected the 4 pin plug and the fault went!! It has remained off so far since. The logical conclusion is now that the problem lies at the IACV end rather than the ECU end which seemed the logical conclusion earlier. As the saying goes “it’s doing me ‘ead in”
I’ve removed the IACV and it seems to be ok. Its clean and the motor spins as it should. My understanding of how the IACV works is that one pair of the 4 wires from the ECU drives the IACV piston all the way down and covers an airway to the throttle body. The second pair of wires then drives the piston back an amount depending on the temperature of the engine. Is this an accurate description of operation?
I also assume that the ECU only returns an error for an electrical problem. If the IACV piston was sticking for some reason the ECU wouldn’t return error although the bike may not idle correctly. Is that too an accurate assessment?
I will persevere!