Power Unit

Power Unit Cut-Away View:

PURPOSE
The power unit supplies the ABS system with brake fluid so that the ABS system can operate properly.

LOCATION
The power unit is located under the modulator on the left-hand side of the engine compartment. The modulator is mounted to the firewall next to the under-hood fuse/relay box.

OPERATION
If the pressure in the accumulator exceeds the prescribed level, the pressure switch is turned ON. Approximately 0.5 seconds after receiving the ON-signal, the ABS control unit stops the motor relay operation. In this state, the pressure in the accumulator reaches 3270 psi (23000 kPa, 230 kg/cm2).

If the pressure doesn't reach the prescribed value after the motor has operated continuously for a specified period, the ABS control unit stops the motor and activates the ABS indicator light.

CONSTRUCTION
The power unit consists of a motor, filter, guide, piston rod and cylinder body. Since the guide is positioned offset to the center of the motor shaft, the rotation of the motor and cylinder body provides reciprocating motion to the piston rod. The brake fluid is thus pressurized and fed to the relief valve, accumulator and modulator.