OPERATING PROCEDURES TMS9000-2 OPERATOR MANUAL
4-12
Published 02-21-2019, Control # 611-05
prevent an accident if the driver is speeding or following too
closely on slippery surfaces.
The ABS control unit contains a self-testing program that is
engaged each time the ignition is turned on. The operator
can verify the testing by listening for the burst of air from the
ABS modulator valves actuating twice in series. To increase
the sound, hold down the foot brake pedal when the ignition
is turned on. The self-test is not finished and the indicator will
stay on until the brake pedal has been pressed. The wheel
speed sensors are tested when the crane starts to move.
ABS Power-Up Sequence
When ignition power is applied, the ECU will illuminate the
ABS indicator lamp, (1) (Figure 4-14), for approximately
three seconds, after which the lamp will extinguish if no
diagnostic trouble codes are detected.
The ECU will cause the ABS indicator lamp to remain on
whenever full ABS operation is not available due to a
diagnostic trouble code, Refer to the Service Manual for
trouble code information.
ABS Switch Operation
The ABS/Traction Control switch, (3) (Figure 4-14) is used to
diagnose system problems along with blink codes displayed
on the ABS indicator, see the Service Manual for more
information.
AUTOMATIC TRACTION CONTROL (ATC)
FUNCTIONAL OVERVIEW
Just as ABS improves vehicle stability during braking, ATC
improves vehicle stability and traction during vehicle
acceleration. The EC-60™ Premium controller (ECU) ATC
function uses the same wheel speed information and
modulator control as the ABS function. The ECU detects
excessive drive wheel speed, compares the speed of the
front, non-driven wheels, and reacts to help bring the wheel
spin under control. The ECU is configured to use engine
torque limiting and differential braking to control wheel spin.
The ATC system is controlled by the ABS ECU. It helps
improve traction on slippery or unstable driving surfaces by
preventing excessive wheel spin. ATC also enhances vehicle
stability by prevention of initial loss of traction.
NOTE: For more information on the ABS/ATC systems
refer to the Service Manual.
CAUTION
If the ABS indicator comes on during driving or does not
go out after a short time after turning on the ignition, take
the crane to a Grove distributor to repair the ABS or brake
system. The crane will not have full function of the ABS
system making it harder for the crane to stop which could
cause moderate to minor injury.
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