ACE ECU connector pin details (Front suspension)

A road speed signal is transmitted to the ACE ECU as a pulsed digital signal from the Self-levelling/Anti-lock Braking System (SLABS) ECU. The road speed signal is used by the ACE ECU for on and off-road roll compensation.

When reverse gear is selected, an input is received from the reverse lamp switch. When the ACE ECU detects that reverse gear has been selected, the ACE system reverts to a 'locked bars' condition until reverse gear is disengaged.

The diagnostic connection allows diagnostic interrogation of the ACE ECU. The diagnostic socket allows diagnostic equipment to be connected to interrogate the ACE ECU for fault codes.

When system faults are detected by the ECU, the ACE warning lamp in the instrument pack is illuminated by the ECU continuously in amber for minor faults or flashing red with an audible warning for faults which require the driver to stop the vehicle immediately.

The ACE ECU supplies a control current to the pressure control valve in the valve block. The current supplied by the ECU is determined by a number of input signals from the upper and lower accelerometers, road speed etc.. The pressure control valve controls the hydraulic pressure supplied to the actuators proportional to the current supplied by the ECU.

Power is supplied to the two solenoid operated directional control valves (DCV's) in the valve block by the ECU. Together, the DCV's control the direction of flow of hydraulic fluid to the actuators. When the ECU supplies power to the solenoids the valves open allowing hydraulic fluid to flow to the actuators. When power is removed the valves close.

The pressure transducer in the valve block receives a 5 V supply from the ECU. The pressure transducer measures 2

hydraulic pressures in the range of 0 to 180 bar (0 to 2610 lbf.in ) and returns a linear output voltage to the ECU dependent on hydraulic pressure.

The ECU supplies a 5 V current to each of the accelerometers. Each accelerometer is capable of measuring lateral acceleration in the range of ± 1.10 g. An analogue input to the ECU of between 0.5 and 4.5 V relative to the lateral acceleration sensed is returned by each accelerometer. The ECU processes the two signals received to produce a 'pure' lateral acceleration signal which is then used as the main control signal for the ACE system.

ACE ECU connector pin details