ENGINE AR 7E9882 - Caterpillar

Illustration 1 g00873376
Block diagram for the electronic control system for the auxiliary hydraulicsThe auxiliary hydraulic system consists of switches, an ECM, indicators, and actuators.The auxiliary hydraulic ECM gathers information from the switches. The information is processed by the software. The ECM will then activate the indicators and solenoids.The auxiliary hydraulic ECM will communicate with the Caterpillar Electronic Technician (ET) over the Cat Data Link.The auxiliary hydraulic ECM utilizes the following components for the input signals:
Switch (armrest)
Switch (seat)
Switch (parking brake)
Switch (work tool lockout)
Switch (continuous flow)
Switch (interlock override)
Switch (auxiliary hydraulics) (A1)
Switch (auxiliary hydraulics) (A2)
Position sensor (auxiliary control)
Switch (two speed) High Flow Models only
Switch (high flow) (HF1)
Switch (high flow) (HF2)Note: The position sensor (if equipped) is used in place of the switches for the auxiliary hydraulics (A1 and A2).Note: All of the switch inputs must be in the neutral state when power is applied to the machine.The auxiliary hydraulic ECM controls the following components:
Modulating valve (auxiliary hydraulics) (A1)
Modulating valve (auxiliary hydraulics) (A2)
Solenoid valve (pressure release) (later models)
Solenoid valve (two speed)
Indicator (interlock override)
Indicator (two speed) High Flow Models only
Solenoid valve (high flow) (H1)
Solenoid valve (high flow) (H2)The auxiliary hydraulic ECM and the interlock ECM share the inputs of the following switches:
Switch (armrest)
Switch (seat)
Switch (parking brake)
Switch (work tool lockout)