Disco 2 ACE values

tom1979 · Nov 7, 2018

afternoon all,

The search facility seems to have gone again on here. @sierrafery kindly provided some good standard values for the ACE diagnostics - can’t find them now!

I replaced Some sections of ACE pipes today and want to do a system test however I cannot get the residual pressure to below 7.5 bar, it’s sitting consistently around 9 - 10 bar.

sierrafery · Nov 7, 2018

No worries with the 7.5 residual pressure, it happens butbthere are other problems there... the pipes you fitted were the same ID like the originals? any difference in the ID of pressure pipes can mix up the readings

Here's the list:
CORRECT ACE INPUTS

1. DCVs (both) - .001A

2. Pressure control valve: 0 - .012A

3. Pressure sensor: varies between 16 and 19 but if it's out of that range the transducer is gone

4. Residual pressure: between 3 - 6 Bar but can be higher after the vehicle was driven or the ambient temp is low

5. System pressure: around 6 Bar fluctuating upwards a bit

6. Accelerometers: 0.01

for troubleshooting purpose: the resistance of both DCVs(top of the valve block, DCV1-toward front; DCV2-toward rear)= 2.7 Ohm, pressure control solenoid(on the left side of block) = 5.7 Ohm.

tom1979 · Nov 7, 2018

sierrafery said:
No worries with the 7.5 residual pressure, it happens butbthere are other problems there... the pipes you fitted were the same ID like the originals? any difference in the ID of pressure pipes can mix up the readings

Here's the list:
CORRECT ACE INPUTS

1. DCVs (both) - .001A

2. Pressure control valve: 0 - .012A

3. Pressure sensor: varies between 16 and 19 but if it's out of that range the transducer is gone

4. Residual pressure: between 3 - 6 Bar but can be higher after the vehicle was driven or the ambient temp is low

5. System pressure: around 6 Bar fluctuating upwards a bit

6. Accelerometers: 0.01

for troubleshooting purpose: the resistance of both DCVs(top of the valve block, DCV1-toward front; DCV2-toward rear)= 2.7 Ohm, pressure control solenoid(on the left side of block) = 5.7 Ohm.

Hi mate, the hose sections are 1/4”

Photo:

sierrafery · Nov 7, 2018

Then don't expect the factory readings but as long as you feel the system working well and no fault codes it's no problem IMO

tom1979 · Nov 7, 2018

sierrafery said:
Then don't expect the factory readings but as long as you feel the system working well and no fault codes it's no problem IMO

Many thanks. With the residual pressure reading a bit high we’re unable to perform the system test but it seems ok at the moment.

What is the ID of the standard pipes? (I’ve left it at work but 1/4” is about 6mm - can’t be far off ?)

sierrafery · Nov 7, 2018

That's a question for @MJI i think... i dont know exactly, you coud have measured them when you removed them though but at a so sensitive system even 1mm can make a difference in readings but as long as the warning stays off and the system behaves well i dont consider it big issue

MJI · Nov 7, 2018

1/4" BSP is OK for the ram pipes but I had to replace my pump sections with 3/8" BSP otherwise I got speed of operation errors.

Only a mm or so different inside but it makes a lot of difference to fault codes.

Original pipes are 3/8" or 9.5mm external diameter about 7mm internal, 1/4" BSP is about 6.25mm internal.

Enough to trigger the odd error.

My pump sections which are 1/4BSP at the block end are around 9.5mm internal

tom1979 · Nov 7, 2018

MJI said:
1/4" BSP is OK for the ram pipes but I had to replace my pump sections with 3/8" BSP otherwise I got speed of operation errors.

Only a mm or so different inside but it makes a lot of difference to fault codes.

Original pipes are 3/8" or 9.5mm external diameter about 7mm internal, 1/4" BSP is about 6.25mm internal.

Enough to trigger the odd error.

My pump sections which are 1/4BSP at the block end are around 9.5mm internal

Excellent, many thanks. I’m going back up the workshop tonight so will measure but 3/8 to 1/4 would explain the slight pressure increases.

I didn’t replace all the pipes in the system, just all the pipes about a foot or so either side of the pump, as I had some pipes starting to leak where they enter the valve block.

MJI · Nov 8, 2018

tom1979 said:
Excellent, many thanks. I’m going back up the workshop tonight so will measure but 3/8 to 1/4 would explain the slight pressure increases.

I didn’t replace all the pipes in the system, just all the pipes about a foot or so either side of the pump, as I had some pipes starting to leak where they enter the valve block.

That is the standard technique.

Mine are about 900mm long and join just back of the front springs.

Disco 2 ACE values

tom1979

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sierrafery

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tom1979

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sierrafery

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tom1979

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MJI

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tom1979

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