ABS ECU and Modulator

ABS ECU and Modulator

The ABS ECU (C0506) provides outputs to the ABS modulator (C1591 on LHD, C0501 on RHD) as follows:

The ABS modulator LH front outlet valve is driven by the ABS ECU via an SW wire. The ABS modulator LH front inlet valve is driven by the ABS ECU via an SR wire. The ABS modulator RH front outlet valve is driven by the ABS ECU via an SG wire. The ABS modulator RH front inlet valve is driven by the ABS ECU via an SU wire. The ABS modulator LH rear outlet valve is driven by the ABS ECU via an SY wire. The ABS modulator LH rear inlet valve is driven by the ABS ECU via an SN wire. The ABS modulator RH rear outlet valve is driven by the ABS ECU via an SP wire. The ABS modulator RH rear inlet valve is driven by the ABS ECU via an SK wire.

The ABS ECU (C0504) and the modulator (C1592 on LHD, C0500 on RHD) are both earthed on B wires.

The ABS modulator (C1591 on LHD, C0501 on RHD) provides outputs to the ABS ECU (C0506) as follows:

An earth monitoring signal is provided to the ABS ECU on a B wire. A brake pedal signal is provided to the ABS ECU on an RB wire.

Engine Control Module

The Engine Control Module (ECM) provides information to the ABS ECU to enable optimum TC performance. The ECM (C0658) is connected to the ABS ECU (C0504) as follows:

The ECM provides the ABS ECU with a Pulse Width Modulated (PWM) signal on an SP wire. This signal includes information on engine torque, engine throttle, engine type, and throttle type. The ECM provides the ABS ECU with pulsed voltage signal on a YK wire. This signal informs the ABS ECU of engine speed. The ECM provides the ABS ECU with two voltage pulses per engine revolution.