Well here's a new one on me, yesterday while attempting to leave the slip neither motor would engage reverse. The shift levers worked fine and forward worked fine , but when in reverse it acted like it was in neutral, the motors would rev as I advanced the levers but not engage. I use the boat frequently and has only been 5 days since it worked fine, transmissions have correct fluid levels and the batteries are fully charged. The boat is a 2003 and the first year of the fully electronic Volvos. I checked all the breakers and everything looks fine, I'm sure there is a trigger wire to engage the transmission, I checked the owners manual but cant find a wiring diagram for this problem. Any help would be appreciated .
41 PC Volvo TAMD 75 EDC wont engage reverse
- Thread starter overboard
- Start date
Hi overboard. I have a 2002 41pc with tamd 74s. I have a problem with the port engine not engaging into forward at times. I do not have the single handle Volvo controls. They are separate transmission and throttle. We changed the solenoid and rebuilt the transmission pressure pump. I had an expert Volvo mechanic look at it and he was stumped. The only thing that helped was switching the engine computers and re-programming the controls. It went away for a whole year but now it rears its ugly head again on occasion. The funny part is that it only happens when the engines are warmed up. Once it's in gear they run perfect. What transmissions do you have? I believe mine are ZF 280-A1. I believe that it's a bad wiring harness. The Volvo engines had a recall on the wiring harness at one time. Do a search you will find a lot on it. Let me know. Divergirl and I have the same boat!! She is having shifting problems also.
Divergirl
Member
Hey there Overboard....I have had a myriad of problems with my TAMD74 engines on my 2002 41 PC. jlazzfp is correct in that the wiring harness was the original fix for a safety recall Volvo Penta issued years ago. I am the 2nd owner of my boat and I have owned it since 2004 so, it was almost brand new with a few hundred engine hours. My first issue was the SB engine throwing itself into forward high gear while in idle or neutral....pretty scary. I did not know this was a safety recall because the yacht broker I used never transferred the engine ownership to me or, did not advise me to do so, therefore VP had no clue I owned the engines and sent the recall to the original owners. They sent a VP mechanic to my boat in 2014, after I contacted them and advised I had never been contacted. This mechanic redid the wiring harness. All seemed fine for awhile and then it continued to rear its ugly head whenever it chose to do so. So far, VP has replaced the EDC pad, the potentiometer, and just last Thurs. they replaced the SB computer. I took her out last Saturday and she ran like a champ but again, this problem is periodic. In 2015 the port started acting up in that there was first a hesitation when engaged in forward and then after a few months of hesitation, it would not move forward at all. Never had a reverse problem in either engine but, there is a guy down here (mechanic told me this) that has a 64 foot flybridge and the same engines and his throw themselves into forward & reverse at top speed. I ended up having the port tranny craned out and sent down to ZF Transmission in Mirimar FL....I live in the Ft. Lauderdale area. They rebuilt the tranny and told me that dirt had caused a scoring of some sort. After the tranny was craned back in and I was bringing my boat back to my dock, it stopped working in forward AGAIN...after $3,500. I was furious. The mechanic I used came to my dock and flushed everything with 5 gallons of mineral water, I believe. He saw a lot of little particles that he said felt almost like sand but, it wasn't. We concluded it must have been metal shavings from the scoring that needed to work itself out. So, far all OK with the tranny and, as I said, I have a brand new computer on SB.
BTW everyone......there is a guy who is a neighbor of mine and he posted on Nextdoor that his VP diesel engines were throwing themselves into gear but weirdly, they are 24v KAMD44PE engines on a 2001 boat. Any commentary on this? I find it pretty interesting that there appears to be different VP diesel engines all with the same problems.
BTW everyone......there is a guy who is a neighbor of mine and he posted on Nextdoor that his VP diesel engines were throwing themselves into gear but weirdly, they are 24v KAMD44PE engines on a 2001 boat. Any commentary on this? I find it pretty interesting that there appears to be different VP diesel engines all with the same problems.
Thanks for the reply jlazzfp, yes I have the ZF 280-A1 transmissions, I also have the single handle control. This is only happening on the starboard transmission, the port works fine, I checked and the solenoid is not engaging, either a bad solenoid or the valve is stuck. I only have 520 hours on the boat and it's the best boat I ever owned, I have the manuals for the transmission and have read all the information. I called a local Volvo marine repair service and I don't believe he has a clue, so I'm going to test the solenoid today and replace/repair as necessary. The fluid is full and as clear as the day it went in, all fluids on the boat are changed annually, I believe this is the first motor with EDC, it has worked flawlessly since new, I'll post what I find.
Andrew
Andrew
Yes guys. We do have the EDC on ours. It's all electronic. Even though we don't have the single handles. Overboard, see if the transmission engages manually from the tranny itself. There may be a bad potentiometer causing lack of current to raise the solenoid. I'm no electrician but if I remember correctly there should be 5mv going to the solenoid. I was also told there was something like a neutral safety switch that should be checked. Please let us know. These VP Tamd engines can be finicky! But when they run they run like crazy!!! BTW my friend 2 boats away from me has a 2000 41 PC with the same engines. He started to have a similar problem just last week. Crazy !!
How do you clean the solenoid? They are the two solenoids on trans with wires marked primary and secondary. Was going out for snakedown and no forward on stRboard.Third yeR i have had her and no problems yet. Funny i had an issue getting into slip last week and blamed it on wind and withbow and stern thrusters never thought about her not going into gear.
To clean the solenoid itself you have to remove the electronic control mechanism on primary. Then unscrew the solenoid from the transmission. I was told to clean the screen on the solenoid with mineral spirits. Did you check the EDC control pad ? See if there was an error code. May give you more information.
Yes was on phone with Mechanic and he walked me thru it. But no codes. Waiting for him right now. Also i believe 2000 was the first year they went drive by wire - mine is a 2000.
Okay so mechanic came and after 15 minutes we both thought it was the Solenoids, so we took them out cleaned the screens and reinstalled, still no Forward on Starboard Engine.
Next we switched the solenoids, still no forward on Starboard, So Solenoids were not the issue - just to be sure we took solenoids off on Port engine and put in Starbaord engine - confirmed our thoughts Solenoids are good,
Thank God because they are $1800 each.
Next we cleaned every connection along the way - still no fix -
next we proceed to check the potentiometers and switch them - port shift now works starboard motor and Starboard shifter controls port motor now port motor has no forward - so both potentiometers are good
Wiring from potentiometer to solenoid is now our plan of attack.
Apparently I have Semi drive by wire - Both Throttles and Shifters have cables that go to box which converts to drive by wire
Not to find this box - Engine Room, Bilge, behind frog, under cushions in rear bedroom, dash panel removed, throttles removed, panels at the helm by my feet removed still no luck - finally stick our hands into hole starboard at foot level find the box and wiggle the connections and now she goes into forward but we cannot disconnect and clean terminals because we will not be able to plug them back in - So I am not a happy boster we found where the problem is but can do nothing but wiggle wires. Getting late and other issues need to be addressed so finish all up and put her back together - tried her 10 times and she worked every time. Do not feel warm and fuzzy.
Next we switched the solenoids, still no forward on Starboard, So Solenoids were not the issue - just to be sure we took solenoids off on Port engine and put in Starbaord engine - confirmed our thoughts Solenoids are good,
Thank God because they are $1800 each.
Next we cleaned every connection along the way - still no fix -
next we proceed to check the potentiometers and switch them - port shift now works starboard motor and Starboard shifter controls port motor now port motor has no forward - so both potentiometers are good
Wiring from potentiometer to solenoid is now our plan of attack.
Apparently I have Semi drive by wire - Both Throttles and Shifters have cables that go to box which converts to drive by wire
Not to find this box - Engine Room, Bilge, behind frog, under cushions in rear bedroom, dash panel removed, throttles removed, panels at the helm by my feet removed still no luck - finally stick our hands into hole starboard at foot level find the box and wiggle the connections and now she goes into forward but we cannot disconnect and clean terminals because we will not be able to plug them back in - So I am not a happy boster we found where the problem is but can do nothing but wiggle wires. Getting late and other issues need to be addressed so finish all up and put her back together - tried her 10 times and she worked every time. Do not feel warm and fuzzy.
Hi Botjem. I’ve never seen this hybrid system. Unless you have a different system than I do the potentiometer on the control lever changes it from mechanical to electrical. If you take you control levers out both transmission and throttles a wiring harness is directly connected to the potentiometer. There are no cables on my system at all. My dock mate has the same boat as you do and has the same control system as I do. We’ve both had the controls out and replaced the potentiometers with no real help to our problems. Must be lower in the wiring harness. I believe the the problem is in the harness that goes from the computer to the transmission.
Divergirl
Member
Hi Botjem….I believe that Jlazzfp means the computer on the engine. In fact, VP ended up replacing the computer on the SB engine in July of 2018 which, did not help the situation of the SB engine engaging itself into high forward gear all on its own...in neutral! I finally found a VP mechanic in Delray Beach FL who researched and found a fix issued in 2015 which is a black box that is installed somewhere around the potentiometers and that was my fix. I am still incredulous that even VP did not suggest this as they kept sending Jas Marine to my boat up to 7/18. This turned out to be a $1,300 fix...parts & labor! Not one mechanic at Jas Marine knew about this part issued in 2015....one hand did not know what the other hand was doing sort of thing!
When my port engine lost engagement in forward....back end of 2015, beginning of 2016...I ended up having the port tranny craned out and rebuilt at ZF Transmission in Miramar FL. I never lost reverse but they replaced that clutch as well, and all has been fine since then.
When my port engine lost engagement in forward....back end of 2015, beginning of 2016...I ended up having the port tranny craned out and rebuilt at ZF Transmission in Miramar FL. I never lost reverse but they replaced that clutch as well, and all has been fine since then.
Hi guys. Yes that is the computer that I’m speaking of. I can’t find the black box that was “supposedly “ Installed in the boat since Volvo says the wiring harness recall was done! Any ideas where to look. I think I checked all the likely places under the dash and under the throttle controls. I’m stumped. My mechanic friend and I are going down tomorrow to try to disconnect all the harnesses, clean them and see what happens. I’m amazed no one has a fix for this issue. I can’t even get a response from Formula tech!