Operation
ACE Operation
Mains supply
The coil of the ACE relay is connected to pin C0647-6 on a BR wire to the ACE ECU. When conditions are correct the ACE ECU provides an earth path for the relay coil, which allows the feed from fuse 15 to energise the coil and close the relay contacts.
When the ACE relay contacts close, the feed from fuse 15 passes through the contacts and passes on a PO wire to pin C0647-28 on the ACE ECU
Road speed signal
The ACE ECU receives a road speed signal from pin C0504-3, via header C0290, to ACE ECU pin C0647-5 on a KG wire.
ACE ECU
The ACE ECU receives two earth connections on B wires from pins C0647-20 and C0647-32 to earth header C0018 LHD/C0017 RHD
ACE upper accelerometer
The ACE ECU provides a power supply output on a YR wire from ECU pin C0647-18 to the upper accelerometer pin C0657-3.
The ACE ECU receives an earth input from the upper accelerometer pin C0657-2 to ECU pin C0647-34 on a YG wire
The ACE ECU receives a signal input from the upper accelerometer pin C0657-1 to ECU pin C0647-17 on an OU wire.
ACE lower accelerometer
The ACE ECU provides a power supply output on a YB wire from ECU pin C0647-12 to the lower accelerometer pin C0656-3
The ACE ECU receives an earth input from the lower accelerometer pin C0656-2 to ECU pin C0647-33 on a YK wire
The ACE ECU receives a signal Input from the lower accelerometer pin C0656-1 to ECU pin C0647-15 on an OS wire.
ACE valve block
The ACE valve block houses the pressure transducer pressure control valve and two directional control valves. The ACE ECU sends and receives inputs and outputs to the valve block components as follows:
Pressure transducer
The ACE ECU provides a power supply output on a KY wire from ECU pin C0647- 13 to the pressure transducer pin C0770-3
The ACE ECU receives an earth input from the pressure transducer pin C0770-1 to ECU pin C0647-21 on a UG wire.
The ACE ECU receives a signal input from the pressure transducer pin C0729-2 to ECU pin C0647-16 on a KW wire.
Pressure control valve
The ACE ECU provides a power output on a P wire from ECU pin C0647-27 to pressure control valve pin C0728-2.
The ACE ECU receives an earth input on a BG wire from ECU pin C0647-25 to the pressure control valve pin C0728-1
Directional control valves
The ACE ECU provides a power supply output on a GR wire from pin C0647-24 to the directional control valve 1 pin C0770-2 and directional control valve 2 pin C0771-2.
The ACE ECU receives an earth input from directional control valve 1 pin C0729-1 to ECU pin C0647-23 on an OG wire
The ACE ECU receives an earth input from directional control valve 2 pin C0771-1 to ECU pin C0647-22 on a YB wire.
Instrument pack
The ACE ECU provides a warning lamp output to the instrument pack from ECU pin C0647-36 to the instrument pack pin C0233-1 on a BO wire.
Engine speed signal
The ACE ECU receives an engine speed input signal from the ECM.
On V8 engine vehicles the signal is passed from ECM pin C0637-17 on a WS wire, via header C0291, to ACE ECU pin C0647-19.
On Td5 engine vehicles the signal is passed from ECM pin C0658-19 on a WS wire, via header C0291, to ACE ECU pin C0647-19.
Reverse gear signal
The feed from fuse 25 in the passenger compartment fusebox is connected to the reverse lamp switch (manual gearbox) or starter inhibitor/reverse light switch (automatic transmission) by a GY wire. When reverse gear is selected the switch closes and the feed is connected to the ACE ECU, by a GN wire via header C0287 LHD/C0294 RHD to provide a reverse gear selected signal The reverse gear selected signal is used by the ACE ECU to set the system in a locked bars condition when reversing.
Diagnostic socket
The ACE ECU provides outputs and receives inputs from the diagnostic socket pin C0040-7 on a K wire via header C0286, to ACE ECU pin C0647-10