ACR Troubleshooting Info
Thread Starter
|
Road Master
Joined: Aug 2007
Posts: 838
Likes: 35
From: Northern California
ACR Troubleshooting Info
Anyone have troubleshooting information on the H-D ACRs? I finally have my 103" conversion ready to ride, but it is very difficult to start, well impossible. I don't think the ACRs are opening on startup.
Thread Starter
|
Road Master
Joined: Aug 2007
Posts: 838
Likes: 35
From: Northern California
Well, I installed the solenoids into the heads. I also installed a wire harness from the electrical caddy to the solenoids. The harness provides power and it also had a wire that went to pin 15 on the ECM connector. My conclusion on the way it works is when you press the starter switch, pin 15 goes to ground and this completes the circuit to energize the ACR solenoid. The documentation that came with the SE ACR wire harness only depicted the harness installation, it did not discuss 'enabling' of the system. Can you provide more details on this process?
Note, that I have a T-Max ECM, Zippers told me it is compatible with the ACRs. However, I disconnected one of the ACR plugs. I inserted a piece of wire inserted into each socket to attach a voltmeter probe. I then hit the starter button (with the starter motor connector disconnected) and neither pin is going low, so I don't think pin 15 on the ECM is going low.
Note, that I have a T-Max ECM, Zippers told me it is compatible with the ACRs. However, I disconnected one of the ACR plugs. I inserted a piece of wire inserted into each socket to attach a voltmeter probe. I then hit the starter button (with the starter motor connector disconnected) and neither pin is going low, so I don't think pin 15 on the ECM is going low.
Last edited by harley_jeff; May 12, 2012 at 10:20 AM.
Ultimate HDF Member
Joined: Jan 2008
Posts: 6,532
Likes: 132
From: SoCal
Well, I installed the solenoids into the heads. I also installed a wire harness from the electrical caddy to the solenoids. The harness provides power and it also had a wire that went to pin 15 on the ECM connector. My conclusion on the way it works is when you press the starter switch, pin 15 goes to ground and this completes the circuit to energize the ACR solenoid. The documentation that came with the SE ACR wire harness only depicted the harness installation, it did not discuss 'enabling' of the system. Can you provide more details on this process?
Note, that I have a T-Max ECM, Zippers told me it is compatible with the ACRs. However, I disconnected one of the ACR plugs. I inserted a piece of wire inserted into each socket to attach a voltmeter probe. I then hit the starter button (with the starter motor connector disconnected) and neither pin is going low, so I don't think pin 15 on the ECM is going low.
Note, that I have a T-Max ECM, Zippers told me it is compatible with the ACRs. However, I disconnected one of the ACR plugs. I inserted a piece of wire inserted into each socket to attach a voltmeter probe. I then hit the starter button (with the starter motor connector disconnected) and neither pin is going low, so I don't think pin 15 on the ECM is going low.
Thread Starter
|
Road Master
Joined: Aug 2007
Posts: 838
Likes: 35
From: Northern California
I didn't see any place to enable ACRs in the t-max s/w.
That is for the return. That is one mystery. On the power side, the new ACR +V leads gets power from the fuse energized from the system relay, which is only closed for a few seconds after the run switch is closed. I was taught that you close the 'run' switch, wait for the fuel pump to stop/light to go out and then hit the starter button. That does not lok like that is going to work with ACRs due to the 3 second window that have power. What is the correct sequence for starting the engine with ACRs? Is that how the system relay works?
That is for the return. That is one mystery. On the power side, the new ACR +V leads gets power from the fuse energized from the system relay, which is only closed for a few seconds after the run switch is closed. I was taught that you close the 'run' switch, wait for the fuel pump to stop/light to go out and then hit the starter button. That does not lok like that is going to work with ACRs due to the 3 second window that have power. What is the correct sequence for starting the engine with ACRs? Is that how the system relay works?
Ultimate HDF Member
Joined: Jan 2008
Posts: 6,532
Likes: 132
From: SoCal
I wish I could give you more info. I am running the factory computer w/sepst and the acr's were installed and enabled as per instructions that came with them. Mine seem to be opened with the start button but I never investigated as they worked as designed and have not failed to open.....yet. I will sometimes wait as you described and sometimes not wait for pump and it all seems to work fine.
Thread Starter
|
Road Master
Joined: Aug 2007
Posts: 838
Likes: 35
From: Northern California
I wish I could give you more info. I am running the factory computer w/sepst and the acr's were installed and enabled as per instructions that came with them. Mine seem to be opened with the start button but I never investigated as they worked as designed and have not failed to open.....yet. I will sometimes wait as you described and sometimes not wait for pump and it all seems to work fine.
Trending Topics
Road Master
Joined: Oct 2006
Posts: 1,124
Likes: 23
From: Mishawaka,Indiana
I just installed a set and the directions say do not plug them in until acr's have been enabled or damage to the acr's may occur. Not sure what difference it makes if they aren't working. has to be a setting in the tmax software. Mike
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Thread Starter
|
Road Master
Joined: Aug 2007
Posts: 838
Likes: 35
From: Northern California
I didn't understand that either - if they are not "enabled" pin 15 on the ECM is going to stay electrically 'open,' right? I disconnected the harness going to the rear ACR and with 12V placed across the two pins the solenoid closed and made a very distinctive sharp sound. So, I know the solenoid itself is working. The problem I believe I have is pin 15 on the ECM is never going to ground. The other question I have has to do with how the system relay works and why the ACR hot leads only stays at 12V for 3 seconds.
Ultimate HDF Member
Joined: Jan 2008
Posts: 6,532
Likes: 132
From: SoCal
I just looked at the sheet and it refers to pin 19 not 15 but this is the sheet I just read so I don't know if it is applicable to you or not. http://www.harley-davidson.com/en_US...ts/-J04441.pdfMaybe I am reading it incorrectly?