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IACV explained
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max Online
Road Warrior

Auckland New Zealand
Posts: 1,545
Joined: Sep 2017
Post: #21
RE: IACV explained
(02-20-2018 01:37 PM)popgun Wrote:  I have sent Sportsterdoc the info he requested and I would suspect he will post on it later. I would, but I’m letting Max and Doc do the posting. They are better at it Smile

Changing or getting to the IACV is a LOT of work. Thus the heavy labor charge. Just accessing the connector is easy as Doc has shown.

Thanks Popgun, for Dave's info i will post part of an e-mail sportsterdoc sent me that describes the access to the iacv connector;

Lift tank, remove right side throttle body cover
Using right hand, depress connector locking tab with thumb, press, then lift up.

Wish removing IACV were that easy!

iacv connector in place
İmage

iacv connector removed
İmage

Tadaa.

sometimes i get lucky, and the more i practice the luckier i getCool
and; It's always something simple......just not always simple to find.
2020 cb1000r chromos red
2010 cb1100 candy red
2006 cb919 hornet black
1977 cb550 k3 1st owner
02-20-2018 01:59 PM
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SportsterDoc Offline
High Mileage

New Mexico
Posts: 1,447
Joined: Nov 2017
Post: #22
RE: IACV explained
Max, thank you for posting the photos of the IACV on my 2014 standard.

Popgun, thank you for info from FSM pages 5-41 and 5-42

Below are a condensation of those pages:

Note: These tests may be done with IACV mounted, by lifting rear of fuel tank and removing right side throttle body cover.


1. After clearing stored DTC, per page 5-14, recheck for stored DTC 29-1. If none, then prior DTC was intermittent.

2. Measure resistance of each of the four wires at the ICAV connector (disconnected, harness side, not IACV side). Continuity to ground should be infinity. If not, the wiring harness has a short to ground.

3. Check continuity to ECM, from disconnected ECM 33 pin connector to disconnected IACV 4 pin connector
Positions are numbered with locking tab up:
ECM A6 black/yellow to IACV connector postion 1 (left)
A17 black/red, position 2
A16 black/blue, position 3
A7 black/orange, position 4 (right)

4. Measure IACV resistance, (IACV side, disconnected), facing with locking tab up at airbox side (mirror image of connector):
position 4 black/yellow (right)
position 3, black/red
postion 2, black/blue
position 1, black orange (left)
a. black/yellow to black orange (2 outside positions), 99-121 ohms at 77F/25C
b. black/red to black/blue (2 inside positions), 99-121 ohms at 77F/25C
If resistance out of spec, FSM declares IACV faulty

My 2 cents: If IACV and wiring tests good, then if symptoms point to IACV, it may be a piston travel issue or air port issue.

23 Guzzi V7 SE 23 Yam XT250
18 Yam Bolt 22 Triumph St Twin 20 CanAm Ryker
14 Honda CB1100 18 Yam XT250 16 Guzzi V7II
17 Yam TW200 12 Triumph Bonnie 02 Sportster 1200S
03 Sportster 883 76 Honda CB750F 75 Honda CB360
70 Yam CT1 72 Yam CT2 72 Yam AT2
70 Honda SL350 70 Honda CL350 67 Honda CL160
67 Honda CB16062 Honda CA110
02-20-2018 04:23 PM
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Dave Offline
High Mileage

San Diego, ca
Posts: 934
Joined: Jan 2014
Post: #23
RE: IACV explained
Hi Doc, thank you again for all of your help. I don't mean to sound dumb, but can you please clarify how to perform step #3? I assume the ECM is somewhere beneath the seat, and can be easily accessed, or you would have provided instructions for how to locate it. A picture of the disconnected ECM 33 pin that shows the locations of A6, A17, A16, and A7 would be worth a thousand words. Does the ECM 33 pin need to be disconnected from the ECM to perform these resistance tests?

My bike has never exhibited an error code, except when I unplugged the EOT sensor; do I need to perform step #1?

I will perform these tests, but first I would like to clean all of the connections you described in a different post (or maybe it was a PM?). I can clean each connector and perform a test separately, if this would help generate information for the team. I would have to ride the bike about 10 miles after each connector was cleaned to perform any kind of a meaningful test, so it would take me one day between each test. Please advise.

Thanks again to the entire team. I can't remember the last time I have seen such incredible team work!
02-20-2018 07:06 PM
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SportsterDoc Offline
High Mileage

New Mexico
Posts: 1,447
Joined: Nov 2017
Post: #24
RE: IACV explained
(02-20-2018 07:06 PM)Dave Wrote:  ...please clarify how to perform step #3? I assume the ECM is somewhere beneath the seat, and can be easily accessed, or you would have provided instructions for how to locate it. A picture of the disconnected ECM 33 pin that shows the locations of A6, A17, A16, and A7 would be worth a thousand words. Does the ECM 33 pin need to be disconnected from the ECM to perform these resistance tests?

3. Check continuity to ECM, from disconnected ECM 33 pin connector to disconnected IACV 4 pin connector
Positions are numbered with locking tab up:
ECM A6 black/yellow to IACV connector postion 1 (left)
A17 black/red, position 2
A16 black/blue, position 3
A7 black/orange, position 4 (right)

A sketch of ECM connector is on page 5-41 of FSM and the details of section 3, including isolating the ECM connector to IACV connector.

The ECM is under the fuel tank, per FSM 17-2 diagram.

(02-20-2018 07:06 PM)Dave Wrote:  My bike has never exhibited an error code, except when I unplugged the EOT sensor; do I need to perform step #1?

Need to, no, but it would be interesting to know if a 29-1 code was ever set

(02-20-2018 07:06 PM)Dave Wrote:  I will perform these tests, but first I would like to clean all of the connections you described in a different post (or maybe it was a PM?). I can clean each connector and perform a test separately, if this would help generate information for the team. I would have to ride the bike about 10 miles after each connector was cleaned to perform any kind of a meaningful test, so it would take me one day between each test. Please advise.

When you disconnect the IACV, if it looks sanitary, you may not need to do anything. If you see any signs of corrosion or crud, then contact cleaner and perhaps a soft tooth brush would be helpful. Same with ECM connector. Both are sealed connectors...so, main concern may be a damaged/tweaked contact.

If the IACV stepper is cycling (stepping/attempting to step) then wire continuity is not likely an issue...unless a break makes contact intermittent.

First recommended step is to simply disconnect IACV, inspect wires and contacts, clean as appropriate, then reconnect and go for a ride.

23 Guzzi V7 SE 23 Yam XT250
18 Yam Bolt 22 Triumph St Twin 20 CanAm Ryker
14 Honda CB1100 18 Yam XT250 16 Guzzi V7II
17 Yam TW200 12 Triumph Bonnie 02 Sportster 1200S
03 Sportster 883 76 Honda CB750F 75 Honda CB360
70 Yam CT1 72 Yam CT2 72 Yam AT2
70 Honda SL350 70 Honda CL350 67 Honda CL160
67 Honda CB16062 Honda CA110
(This post was last modified: 02-21-2018 09:47 AM by SportsterDoc.)
02-21-2018 09:40 AM
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SportsterDoc Offline
High Mileage

New Mexico
Posts: 1,447
Joined: Nov 2017
Post: #25
RE: IACV explained
Looking at the throttle body assembly on-line, it appears that the assembly is very complete, not only including the TPS, IACV, but all the hoses, tubes, pipes, 4 way and 5 way vacuum fittings, and even fuel injectors. No wonder is it a "fix".

http://www.2wheelpros.com/oem-parts/2014...mbly.html#

For those cured by throttle body assembly replacements, note that doing so eliminates, for their application, the following:

1. ECM
2. ECM program (unless a new program loaded with the TB replaced)
3. MAP
4. EOT
5. IAT
related wiring and connectors

4800 miles since 7 Nov 2017
only ran errands today (~40 miles), 48 MPG, typical 51 MPG
Cycle Gear has a sale on Freeze-Out thermals
Already had the pants/long johns (block the wind through jeans, very well)
Got the long sleeve T for $19.97 (67% off).
Not many sizes on the rack, but can be ordered on-line.
Hoping to go across the desert to Los Angeles in a couple weeks.

23 Guzzi V7 SE 23 Yam XT250
18 Yam Bolt 22 Triumph St Twin 20 CanAm Ryker
14 Honda CB1100 18 Yam XT250 16 Guzzi V7II
17 Yam TW200 12 Triumph Bonnie 02 Sportster 1200S
03 Sportster 883 76 Honda CB750F 75 Honda CB360
70 Yam CT1 72 Yam CT2 72 Yam AT2
70 Honda SL350 70 Honda CL350 67 Honda CL160
67 Honda CB16062 Honda CA110
02-26-2018 04:38 PM
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