ELECTRICAL SYSTEM CONTINUED
Electronic Brake Control
The ECM controls the service brakes on the machine. The ECM uses PWM input from a position sensor on the
service brake pedal in order to send the appropriate current signal to the proportional brake solenoid. The ECM
control of this solenoid determines the amount of braking that is applied to the left hand service brake according to
the position of the brake pedal.
The ECM also monitors the status of the parking brake system and the secondary brake system. The ECM is not
the primary controller of these two systems. The ECM has secondary control over these two systems and it will
control the parking brake solenoid and the secondary brake solenoid when certain machine conditions occur.
The autoshift function allows the operator to preset the gear speed for directional shifting. The autoshift function
allows a directional shift that differs from a normal shift. Normally, the machine shifts from 1F to 1R.
With the autoshift switch, the operator can select either 1F to 2R, 2F to 2R, or 2F to 1R. The autoshift indicator
displays the status of the autoshift function to the operator. The indicator is on the left side of the dash. The
indicator is near the autoshift switch. The operator selects the autoshift operation with the autoshift switch. The
autoshift indicator shows the selected mode. The modes are 1F2R or 2F2R or 2F1R. When all LED indicators are
OFF, the autoshift function is OFF.
Auto Kickdown Operation
When the ECM detects that the torque converter output speed has fallen below an engine speed dependent pre-
set shift point, the ECM will automatically downshift the transmission.
There are several auto kickdown setpoints. The operator can scroll through the setpoints or turn the auto kickdown
function ON or Off by depressing the auto kickdown switch. For example, if the auto kickdown function is OFF
when the operator presses the auto kickdown switch, the function will be turned ON and the first setpoint is
activated. When the auto kickdown switch is pressed again, a different setpoint is activated.
On some models, a third setpoint can be activated. When the auto kickdown switch is pressed after all of the
setpoints have been scrolled, the auto kickdown function is turned OFF. The auto kickdown indicator displays the
status of the auto kickdown operation to the operator. The indicator is located on the right side of the dash near the
auto kickdown switch.
N OT E
The auto kickdown operation is inhibited when the brakes are applied.
Backup Alarm Operation
The backup alarm alerts the surrounding personnel that the machine is backing up. Whenever the transmission
direction control lever is in the REVERSE position, the ECM activates the backup alarm.
Neutral Start Operation
The powertrain electronic control system and the parking brake switch perform the neutral start function. The
starting motor will not activate unless the parking brake switch is in the ON position. Whenever the operator places
the parking brake switch in the ON position, the ECM will shift the transmission to Neutral and Third Speed