2006? Crusader 6.0L Throwing a 2123 Code TCP1 Voltage Low

[narnone]

The engine started to bog late last year. At that time no trouble codes were shown.
Using Diacom's software.
As the weather was getting cold, we could not really trouble shoot.

We pulled the engine to do some work on the hull.

Started to trouble shoot last year's problem.
She is now throwing a code:
Code: 2123
Description: TCP1 Voltage Low

The images do not seem to refresh right.
Here are my readings.
I do not have a good wiring diagram.
I did change the TPS on the throttle body. Did not make a difference.
I am not sure what wire is used and is this on the throttle body, or on the rheostat for the throttle.

Everyone has a different name.
I have had issues with the harness on this engine.
Could be a broken wire.
I need a good wiring diagram.
I can put a scope on the lead to what is happening.

 

[Fun Times]

With changing the TPS, it appears you may just be starting out in the wrong direction to follow a path to the engine itself as the TPS is located on the engine while the TCP is located at/as the Throttle Control Handle/Lever itself which ought to make your system a digital control system vs an old-time throttle cable type system.

Throttle Control Position sensor​

In marine engines, TCP1 refers to the Throttle Control Position sensor. It is one of the components that control the throttle or speed of the engine. If the TCP1 voltage is higher than expected, it may indicate an issue with the sensor or its wiring.

For instance, this other fellow boater ended up needing a new throttle control unit,

DTC 2121 Throttle Control Position (TCP) sensor1-2 lower than expected. - PlanetNautique Forums

Just took my 2019 G23 out. Fine for an hour then it threw this code. No throttle. Powered off/on, tried again. Same thing as soon as it gets to quarter throttle. Power off/on and then limped home at 4mph. Boat has 30 hours. My 4th July weekend is a bust. Found the code online but no action other...

www.planetnautique.com

^PS: Not sure of yours being in there but that linked website seems to offer wiring diagrams easily accessible at the very top of the forum highlighted in red... Kind of is all...

Your data log photo only shows the (1) throttle command percentage value at the bottom of the photo while it shows 4 throttle position values...Are there any other Throttle Control value percentages to share?

Might want to check the wiring between the control handle and engine for damage such as maybe a new screw now hitting the wiring harness from say aftermarket accessories, etc.?.

Hope this helps as a starting point, good luck.

 

[narnone]

With changing the TPS, it appears you may just be starting out in the wrong direction to follow a path to the engine itself as the TPS is located on the engine while the TCP is located at/as the Throttle Control Handle/Lever itself which ought to make your system a digital control system vs an old-time throttle cable type system.

Throttle Control Position sensor​

In marine engines, TCP1 refers to the Throttle Control Position sensor. It is one of the components that control the throttle or speed of the engine. If the TCP1 voltage is higher than expected, it may indicate an issue with the sensor or its wiring.

For instance, this other fellow boater ended up needing a new throttle control unit,

DTC 2121 Throttle Control Position (TCP) sensor1-2 lower than expected. - PlanetNautique Forums

Just took my 2019 G23 out. Fine for an hour then it threw this code. No throttle. Powered off/on, tried again. Same thing as soon as it gets to quarter throttle. Power off/on and then limped home at 4mph. Boat has 30 hours. My 4th July weekend is a bust. Found the code online but no action other...

www.planetnautique.com

^PS: Not sure of yours being in there but that linked website seems to offer wiring diagrams easily accessible at the very top of the forum highlighted in red... Kind of is all...

Your data log photo only shows the (1) throttle command percentage value at the bottom of the photo while it shows 4 throttle position values...Are there any other Throttle Control value percentages to share?

Might want to check the wiring between the control handle and engine for damage such as maybe a new screw now hitting the wiring harness from say aftermarket accessories, etc.?.

Hope this helps as a starting point, good luck.

Yes. I will share them tomorrow.
I thought this may be on the throttle.

 

[narnone]

With changing the TPS, it appears you may just be starting out in the wrong direction to follow a path to the engine itself as the TPS is located on the engine while the TCP is located at/as the Throttle Control Handle/Lever itself which ought to make your system a digital control system vs an old-time throttle cable type system.

Throttle Control Position sensor​

In marine engines, TCP1 refers to the Throttle Control Position sensor. It is one of the components that control the throttle or speed of the engine. If the TCP1 voltage is higher than expected, it may indicate an issue with the sensor or its wiring.

For instance, this other fellow boater ended up needing a new throttle control unit,

DTC 2121 Throttle Control Position (TCP) sensor1-2 lower than expected. - PlanetNautique Forums

Just took my 2019 G23 out. Fine for an hour then it threw this code. No throttle. Powered off/on, tried again. Same thing as soon as it gets to quarter throttle. Power off/on and then limped home at 4mph. Boat has 30 hours. My 4th July weekend is a bust. Found the code online but no action other...

www.planetnautique.com

^PS: Not sure of yours being in there but that linked website seems to offer wiring diagrams easily accessible at the very top of the forum highlighted in red... Kind of is all...

Your data log photo only shows the (1) throttle command percentage value at the bottom of the photo while it shows 4 throttle position values...Are there any other Throttle Control value percentages to share?

Might want to check the wiring between the control handle and engine for damage such as maybe a new screw now hitting the wiring harness from say aftermarket accessories, etc.?.

Hope this helps as a starting point, good luck.

Well, this is not looking like just a swap of a part.
I have PN 3817845 for a throttle control.
Turns out, it's a Volvo item, which I found out my ECM is also Volvo. Found that out years ago.
It looks like Crusader came out with a design with PM R119005A which states my ECM has to be flashed.
Volvo's 3817845 number became 21560199 which is in a kit 21157475.
I will have to talk to Crusader tomorrow to which way this is going. Not even sure this relates to me.
Would like to swap to the later one. Uses a GM throttle sensor. Cheap to purchase going forward.

 

[makomark]

maybe this will help...

 

[narnone]

Spoke to Crusader. The Throttle Control Lever Volvo P/N 3817845 has been updated to Crusader P/N R119005A.
In order to use this, Crusader sent me the download to flash the ECM.
Diacom can flash the ECM.
Once I have the new Throttle Control, I will flash the ECM.
I will keep you informed.

 

[narnone]

I would like to thank Fun Times for leading me in the right direction.
It was the Throttle Lever Rheostat that had the issue.
This 6.0L used the Volvo 3817845 originally.
Crusader updated to their part number R119005A, which is a kit that replaced the Volvo 3817845.
In order to utilize the new part, the ECM had to be flashed.
I have the Rinda/Diacom software. It is capable of flashing OEM ECM’s.
I would like to thank Crusader and Rinda for their swift responses.
I had two choices, send the ECM to Crusader and they would flash the ECM for a nominal charge, or do it myself.
I chose to do it myself.
Crusader sent me the files and instructions.
Rinda explained how to access my ECM. This Crusader has two ports. One is for pulling engine data, the other is the communication network (CAN).
All Flashing need to be done on the CAN connector.
I have to say, the Rinda/Diacom software has been great and the company has really stepped up to help with any issues I have ever had.
Same can be said for Crusader.
Ran the engine on the stand, no trouble codes.
As with any marine engine, the real test is under power.

 

[narnone]

With changing the TPS, it appears you may just be starting out in the wrong direction to follow a path to the engine itself as the TPS is located on the engine while the TCP is located at/as the Throttle Control Handle/Lever itself which ought to make your system a digital control system vs an old-time throttle cable type system.

Throttle Control Position sensor​

In marine engines, TCP1 refers to the Throttle Control Position sensor. It is one of the components that control the throttle or speed of the engine. If the TCP1 voltage is higher than expected, it may indicate an issue with the sensor or its wiring.

For instance, this other fellow boater ended up needing a new throttle control unit,

DTC 2121 Throttle Control Position (TCP) sensor1-2 lower than expected. - PlanetNautique Forums

Just took my 2019 G23 out. Fine for an hour then it threw this code. No throttle. Powered off/on, tried again. Same thing as soon as it gets to quarter throttle. Power off/on and then limped home at 4mph. Boat has 30 hours. My 4th July weekend is a bust. Found the code online but no action other...

www.planetnautique.com

^PS: Not sure of yours being in there but that linked website seems to offer wiring diagrams easily accessible at the very top of the forum highlighted in red... Kind of is all...

Your data log photo only shows the (1) throttle command percentage value at the bottom of the photo while it shows 4 throttle position values...Are there any other Throttle Control value percentages to share?

Might want to check the wiring between the control handle and engine for damage such as maybe a new screw now hitting the wiring harness from say aftermarket accessories, etc.?.

Hope this helps as a starting point, good luck.

Tthanks for your help