Pressure Switch
The pressure switch, screwed into the control valve, controls the hydraulic system pressure between the control valve and the multi disc clutch.The electrical contact opens when pressure rises and this signals the control unit when the required hydraulic pressure to operate the multi disc clutch is available.
The control valve is mounted on the bracket for the oil pressure regulator with the hydraulic accumulator. It is an electrically operated 2/3 way seat valve. In the neutral position, the hydraulic cylinder chamber is connected to the return line and the oil pressure supply is blocked from the hydraulic accumulator. This releases the multi disc clutch, disengaging the four wheel drive.
If the control valve receives voltage from the electronic control unit, the return line is closed and the hydraulic accumulator is connected to the hydraulic cylinder chamber. This applies fluid pressure to the multi disc clutch, engaging the four wheel drive. The solenoid valve is supplied with voltage by the electronic control unit (ECU) and in this way, its functioning is monitored during driving, the control valve is constantly provided with voltage except when the brake pedal is actuated at a speed higher than 25 km/h.When the engine is switched off, the control valve receives no voltage. A hydraulic throttle in the control valve permits soft engagement of the multi disc clutch while driving
hey good man thanx rl give you something for it,i brought a 2nd hand accumulator setup a while back and all was well for a month and its not working again now! thanx chris
got another pressure switch from crhris 2day but sadly the codes 31 no engine rpm+32 pressure switch faullty appear,code 33 however(solenoid valve h voltage) didnt,
check that power was reaching the pressure switch and it is,any ideas?
thanx for your trouble anyway chris i appreciate your help,
also i disconected the wires to da press switch and had the flashing 4x4 light,doesnt that mean stuck in 4x4?as my car wasnt when i did this
sounds like the green wire to the 4x4 ecu (above the fus box) is dodgy, I'm sue this is a 'common' problem. tom was running a comedy wire from the -Ve coil terminal, out the bonnet and in the drivers door to the 4x4 ECU to help diagnose the problem.
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