My 2011 NT700VAA with 59K miles on the clock has suffered an intermittent and infrequent MIL29 IACV fault for some years. This problem has gradually become more frequent to the point I have had to do some investigation.
All indications so far have been that the problem is a wiring problem around the area of the ECU. But all checks on the wiring as per the workshop manual suggests the wiring is sound. No problems show up with my multimeter even when giving the wiring a vigorous vibration test. I am now wondering if I have a problem with poor connection between the 33 pin plug and ECU in spite of liberal doses of contact cleaner,
Some questions for you knowledgeable folk over there
Is it possible to buy a 33 pin plug as used on the NT700?
Is it possible to depin the 33 pin plug as used on the NT700 and if so how?
Could a sticking IACV throw a MIL29 fault?
The “B” plug on my ECU has a metal “chastity belt” that prevents its removal, why does it have this (No mention of one in manual)?
How is this “chastity belt “ removed apart from cutting it off as the nuts are dummies and the bolt looks like an allen key head but isn’t (just a round recess)?
![rsz_ecu_front.jpg](/forums/data/attachments/10/10567-23edd7be96c416a6c05ffca743a13fec.jpg)
![rsz_ecu_back.jpg](/forums/data/attachments/10/10568-80ff736cc55addc982750dace969ac5d.jpg)
The last couple of times I’ve tried the bike, before riding I’ve checked all four wires to IACV and they look sound with no shorts or breaks, I see the correct resistance, around 107 ohms of the IACV coils on each pair of wires and repeatedly turned the ignition on without a MIL29 showing, I get half a mile down the road and the MIL 29 comes on!
Any suggestions welcomed!
All indications so far have been that the problem is a wiring problem around the area of the ECU. But all checks on the wiring as per the workshop manual suggests the wiring is sound. No problems show up with my multimeter even when giving the wiring a vigorous vibration test. I am now wondering if I have a problem with poor connection between the 33 pin plug and ECU in spite of liberal doses of contact cleaner,
Some questions for you knowledgeable folk over there
Is it possible to buy a 33 pin plug as used on the NT700?
Is it possible to depin the 33 pin plug as used on the NT700 and if so how?
Could a sticking IACV throw a MIL29 fault?
The “B” plug on my ECU has a metal “chastity belt” that prevents its removal, why does it have this (No mention of one in manual)?
How is this “chastity belt “ removed apart from cutting it off as the nuts are dummies and the bolt looks like an allen key head but isn’t (just a round recess)?
![rsz_ecu_front.jpg](/forums/data/attachments/10/10567-23edd7be96c416a6c05ffca743a13fec.jpg)
![rsz_ecu_back.jpg](/forums/data/attachments/10/10568-80ff736cc55addc982750dace969ac5d.jpg)
The last couple of times I’ve tried the bike, before riding I’ve checked all four wires to IACV and they look sound with no shorts or breaks, I see the correct resistance, around 107 ohms of the IACV coils on each pair of wires and repeatedly turned the ignition on without a MIL29 showing, I get half a mile down the road and the MIL 29 comes on!
Any suggestions welcomed!