Thread: ACE.

Originally Posted by V8Ian

Any idea what that means, Simon?

Mate I'm really not sure to be honest. This is from RAVE which may help if there are any asociated signs that go with the errors.

Failure modes
Failures where the vehicle can still be driven safely are indicated by the ACE warning lamp illuminating continuously
with an amber colour. The amber warning lamp will remain illuminated until the ignition is turned off. For all faults the
warning lamp will only illuminate again if the fault is still present. Failures which require the driver to stop the vehicle
immediately are indicated by the ACE warning lamp flashing with a red colour and an audible warning. All faults are
recorded by the ACE ECU and can be retrieved with diagnostic equipment.
The following tables show the type of system failures and their effects on the system operation. Torsion bar 'floppy'
means that fluid is allowed to circulate freely through the system. With no pressure in the actuators the torsion bar will
have no effect on vehicle roll. 'Locked bars' means that all pump flow is directed through the valve block and returns
to the reservoir. Both DCV's close and fluid is trapped in the actuators but can flow from one actuator to the other via
the valve block. In this condition the torsion bar will perform similar to a conventional anti-roll bar, resisting roll but still
allowing the axles to articulate.

Acceleration sensors
Failure Effect
Valve stuck closed - No ACE control
Short circuit - Ground No ACE control
Short circuit - VBatt No ACE control
Loose sensor - Erractic ACE activity when driving in straight line

Pressure transducer
Failure Effect
Short circuit - VBatt - Large sensor dead band - possible random movements

Road speed signal
Failure Effect
Open circuit No ACE control - 'Locked bars' condition
Short circuit - Ground - No ACE control - 'Locked bars' condition
Short circuit - VBatt - No ACE control - 'Locked bars' condition

Engine speed signal
Failure Effect
Open circuit No ACE control - 'Locked bars' condition
Short circuit - Ground No ACE control - 'Locked bars' condition
Short circuit - VBatt No ACE control - 'Locked bars' condition

Reverse gear signal
Failure Effect
Open circuit - No reverse signal to ECU. ACE active in reverse, may give abnormal handling when reversing
Short circuit - Ground - No reverse signal to ECU. ACE active in reverse, may give abnormal handling when reversing
Short circuit - VBatt - Permanent reverse signal to ECU. Permanent 'Locked bars' condition

Ignition ON signal
Failure Effect
Open circuit - ECU does not receive ignition ON signal. No ARC control, 'Locked bars' condition
Short circuit - Ground ECU does not receive ignition ON signal. No ARC control, 'Locked bars' condition
Short circuit - VBatt Permanent ignition ON signal to ECU. Possibility of flat battery

Pressure control valve failure
Failure Effect
Open circuit - No ACE control
Short circuit - Ground - No ACE control
Short circuit - VBatt - No ACE control
Valve stuck open - No ACE control
Valve stuck closed - Maximum system pressure - no proportional control. Pressure relief valve operating at 185 bar (2683 lbf.in 2 )

Directional control valves
Failure Effect
DCV 1 Valve open or stuck open, DCV 2 Valve open or stuck open No ACE control - Anti-roll bars floppy
DCV 1 Valve closed or stuck closed, DCV 2 Valve closed stuck closed No ACE control - 'Locked bars' condition (default)
DCV 1 Valve open or stuck open, DCV 2 Valve closed or stuck closed - Vehicle leans to left when pressure is applied to actuators
DCV 1 Valve closed or stuck closed, DCV 2 Valve open or stuck open - Vehicle leans to right when pressure is applied to actuators

Originally Posted by Pedro_The_Swift

silly question I know, but have you eyeballed both rams and linkages?

Leaks would be obvious, for obvious reasons, but a bent or seized ram might be the culprit. I still reckon it's a ride height sensor, but an educated guess is still a guess.

Originally Posted by Tins

Leaks would be obvious, for obvious reasons, but a bent or seized ram might be the culprit. I still reckon it's a ride height sensor, but an educated guess is still a guess.

The sensors there are for the SLS rather than the ACE. The coil ACE don't have them. That said I have triggered the ACE light when I hit the G sensor in the roof looking for power.

Originally Posted by Slunnie

Mate I'm really not sure to be honest. This is from RAVE which may help if there are any asociated signs that go with the errors.

Failure modes
Failures where the vehicle can still be driven safely are indicated by the ACE warning lamp illuminating continuously
with an amber colour. The amber warning lamp will remain illuminated until the ignition is turned off. For all faults the
warning lamp will only illuminate again if the fault is still present. Failures which require the driver to stop the vehicle
immediately are indicated by the ACE warning lamp flashing with a red colour and an audible warning. All faults are
recorded by the ACE ECU and can be retrieved with diagnostic equipment.
The following tables show the type of system failures and their effects on the system operation. Torsion bar 'floppy'
means that fluid is allowed to circulate freely through the system. With no pressure in the actuators the torsion bar will
have no effect on vehicle roll. 'Locked bars' means that all pump flow is directed through the valve block and returns
to the reservoir. Both DCV's close and fluid is trapped in the actuators but can flow from one actuator to the other via
the valve block. In this condition the torsion bar will perform similar to a conventional anti-roll bar, resisting roll but still
allowing the axles to articulate.

Acceleration sensors
Failure Effect
Valve stuck closed - No ACE control
Short circuit - Ground No ACE control
Short circuit - VBatt No ACE control
Loose sensor - Erractic ACE activity when driving in straight line

Pressure transducer
Failure Effect
Short circuit - VBatt Large sensor dead band - possible random movements

Road speed signal
Failure Effect
Open circuit No ACE control - 'Locked bars' condition
Short circuit - Ground No ACE control - 'Locked bars' condition
Short circuit - VBatt No ACE control - 'Locked bars' condition

Engine speed signal
Failure Effect
Open circuit No ACE control - 'Locked bars' condition
Short circuit - Ground No ACE control - 'Locked bars' condition
Short circuit - VBatt No ACE control - 'Locked bars' condition

Reverse gear signal
Failure Effect
Open circuit - No reverse signal to ECU. ACE active in reverse, may give abnormal handling when reversing
Short circuit - Ground No reverse signal to ECU. ACE active in reverse, may give abnormal handling when reversing
Short circuit - VBatt Permanent reverse signal to ECU. Permanent 'Locked bars' condition

Ignition ON signal
Failure Effect
Open circuit - ECU does not receive ignition ON signal. No ARC control, 'Locked bars' condition
Short circuit - Ground ECU does not receive ignition ON signal. No ARC control, 'Locked bars' condition
Short circuit - VBatt Permanent ignition ON signal to ECU. Possibility of flat battery

Pressure control valve failure
Failure Effect
Open circuit - No ACE control
Short circuit - Ground No ACE control
Short circuit - VBatt No ACE control
Valve stuck open - No ACE control
Valve stuck closed - Maximum system pressure - no proportional control. Pressure relief valve operating at 185 bar (2683 lbf.in 2 )

Directional control valves
Failure Effect
DCV 1 Valve open or stuck open, DCV 2 Valve open or stuck open No ACE control - Anti-roll bars floppy
DCV 1 Valve closed or stuck closed, DCV 2 Valve closed stuck closed No ACE control - 'Locked bars' condition (default)
DCV 1 Valve open or stuck open, DCV 2 Valve closed or stuck closed - Vehicle leans to left when pressure is applied to actuators
DCV 1 Valve closed or stuck closed, DCV 2 Valve open or stuck open - Vehicle leans to right when pressure is applied to actuators

Clear as mud, in true Manufacturer's Manual tradition. But, I'll bet the answer is in there. TestBook jargon.

Originally Posted by V8Ian

I occasionally get a red or amber "the doors are falling off" light, on the dash.
Nanocom has recorded an 18-04 fault. Can anyone decipher or explain this, please?

Originally Posted by Slunnie

18-04 fault: Doors fallen off.

Originally Posted by Slunnie

From another place:

Originally Posted by Tins

Got a Nanocom, Ian? Could it simply be a ride height sensor, or somesuch? Can't recall, but does your's have SLS? Mario's thing was almost explosive, which suggests fairly high pressure in the hoses, so a leak would be obvious to say the least. My guess is a sensor.

Yes John, the Nanocom told me the fault code.
If I turn off and restart the car, usually the light goes out.
The doors haven't fallen off, it's not draughty.

Originally Posted by Slunnie

That said I have triggered the ACE light when I hit the G sensor in the roof looking for power.

Say WHAT?? Lordy.

Might be time to change the filter located in the bizzo (can't think of the name) under the drivers side on the chassis rail. Or maybe the pump is on it's way out. Or I could be way wrong on both counts, usually am.

Originally Posted by Tins

Say WHAT?? Lordy.

Mine's a Td5, I'm always looking for power.