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RSLyrick · 09-25-2024

Hey,

I had a quick look at the FSM for in detail description of the DTCs.

"DTC(s) 14, 21, ARE STORED IN THE SELECTIVE RIDE CONTROL
(SRC) MODULE SENSES THAT THE CORRESPONDING ELECTRICAL
ACTUATOR IS MOVING TOO SLOWLY OR NOT RECEIVING THE
CORRECT FEEDBACK SIGNAL"

"DTC(s) 31, 32, 33 OR 34 ARE STORED IF THE SELECTIVE RIDE
CONTROL (SRC) MODULE SENSES THAT THE CORRESPONDING
ELECTRICAL ACTUATOR HAS NOT FOUND THE END STOP
POSITION ON THE SHOCK ABSORBER DURING INITIALIZATION"

The principle of the FX3 system is to adjust the actuator while sensing its position to ensure that the "instruction / shock setting" sent to the actuator has been correctly applied.

DTC 14 seems like the FX3 control system doesn't receive the feedback value at all or that the actuator is not reacting quick enough to the instruction (the feedback values being read out but the actuator actually didn't really have the time to reach its final position, leading of course to an error). Same issue with the DTC32 of the EGR system...

You should refer first to the 3G-9 diagnostic diagramm in the FSM.

DTC 31, 32, 33.

You confirmed that the shock actuators are moving freely.

You should refer first to the 3G-14 diagnostic diagramm in the FSM.

Additionnal info :

When installing new shocks it is mandatory to re-use the position of the actuator used after removing the old shocks (that's what's written in the FSM) :

"Actuator onto cup assembly retainer.
? Use position noted during removal"

My guess is that if you do not reinstall the actuator in its original position, you create some kind of "mechanical offset". What the FX3 think is 0° is actually maybe 5° it didn't reinstall the actuator as it was. It will try to set the shock to 60° upon start up (standard procedure), leading to read back 65° from the feedback signal.

This is just a supposition. If the actuator gear wheel allows you to connect it in every possible position when reinstalling the shocks, this is a really bad design.

They should have made the gear in a way that it's only possible to connect it in a single position. I'm curious to know about how it looks like. In the FSM, the selector gear looks perfectly symetrical allowing it to be connected in every possible way to the actuator...That would explain why they state in the FSM "Use position noted during removal"....Maybe other member can comment on that.

09-25-2024	#4
RSLyrick Join Date: Oct 2023 Location: Germany Posts: 35	Re: FX3 upgrade from 1990 to 1992 Hey, I had a quick look at the FSM for in detail description of the DTCs. "DTC(s) 14, 21, ARE STORED IN THE SELECTIVE RIDE CONTROL (SRC) MODULE SENSES THAT THE CORRESPONDING ELECTRICAL ACTUATOR IS MOVING TOO SLOWLY OR NOT RECEIVING THE CORRECT FEEDBACK SIGNAL" "DTC(s) 31, 32, 33 OR 34 ARE STORED IF THE SELECTIVE RIDE CONTROL (SRC) MODULE SENSES THAT THE CORRESPONDING ELECTRICAL ACTUATOR HAS NOT FOUND THE END STOP POSITION ON THE SHOCK ABSORBER DURING INITIALIZATION" The principle of the FX3 system is to adjust the actuator while sensing its position to ensure that the "instruction / shock setting" sent to the actuator has been correctly applied. DTC 14 seems like the FX3 control system doesn't receive the feedback value at all or that the actuator is not reacting quick enough to the instruction (the feedback values being read out but the actuator actually didn't really have the time to reach its final position, leading of course to an error). Same issue with the DTC32 of the EGR system... You should refer first to the 3G-9 diagnostic diagramm in the FSM. DTC 31, 32, 33. You confirmed that the shock actuators are moving freely. You should refer first to the 3G-14 diagnostic diagramm in the FSM. Additionnal info : When installing new shocks it is mandatory to re-use the position of the actuator used after removing the old shocks (that's what's written in the FSM) : "Actuator onto cup assembly retainer. ? Use position noted during removal" My guess is that if you do not reinstall the actuator in its original position, you create some kind of "mechanical offset". What the FX3 think is 0° is actually maybe 5° it didn't reinstall the actuator as it was. It will try to set the shock to 60° upon start up (standard procedure), leading to read back 65° from the feedback signal. This is just a supposition. If the actuator gear wheel allows you to connect it in every possible position when reinstalling the shocks, this is a really bad design. They should have made the gear in a way that it's only possible to connect it in a single position. I'm curious to know about how it looks like. In the FSM, the selector gear looks perfectly symetrical allowing it to be connected in every possible way to the actuator...That would explain why they state in the FSM "Use position noted during removal"....Maybe other member can comment on that.