Grove Published 01-29-2015, Control # 512-01 7-7
TMS700E SERVICE MANUAL POWER TRAIN
ENGINE CONTROL SYSTEM
Description
The engine control system is an electronically operated fuel
injection system that optimizes fuel economy and reduces
exhaust emissions. It accomplishes this by controlling the
torque and horsepower curve, air fuel control function,
engine high speed, low idle and road speed. The system
monitors critical engine temperatures and pressures, and will
log diagnostic faults when an abnormal operating condition
occurs. If an out of range condition exists, and engine derate
action is to be initiated, the operator will be alerted by an in-
cab warning light. The warning light will flash when out-of-
range conditions continue to get worse.
NOTE: See Operator Manual for additional information on
“Engine Controls and Indicators”
Functional Operation
Five key switch phases govern the operation of the engine
control system:
1. Ignition switch in the on position, engine diagnostics idle
switch off, engine not cranking or running.
2. Ignition switch in the on position, engine diagnostics idle
switch on, engine not cranking or running.
3. Ignition switch in the on position, engine cranking.
4. Ignition switch in the on position, engine running, engine
diagnostics idle switch off.
5. Ignition switch in the on position, engine running, engine
diagnostics idle switch on.
With the ignition switch on, the diagnostic test switch off and
the engine not cranking or running, the Electronic Control
Module (ECM) performs diagnostic and status operations. It
reads the logic inputs from the brake, clutch, and cab
switches and analog inputs from sensors such as the engine
coolant temperature sensor and the manifold boost pressure
sensor. During this phase the data link is active and can be
accessed by the applicable service tools. The ECM opens
the fuel shutoff valve so the engine is ready to be started.
Additionally when the key switch is turned on but the
diagnostic switch remains off, the indicator lights illuminate
for approximately two seconds to verify they are working and
then go out. This is part of the normal operation of the power-
up sequence. However, if an active fault is present, one of
the lights remains illuminated, determined by the type of fault
being sensed.
When the engine diagnostics idle switch is turned on, the red
and amber indicator lights illuminate and remain illuminated
if there is no active fault. If there is an active fault, the lamps
flash in a sequence of pulses to indicate that specific fault
code.
During the cranking phase, with the ignition switch in the
start position, the ECM commands all of the fuel needed to
start the engine. There is no need to use the throttle pedal
while cranking the engine.
While the engine is cranking the ECM is performing
additional diagnostic and status operations. An active fault
causes one of the two indicator lamps to illuminate and
remain lit. Which lamp is illuminated depends on the severity
of the fault.
Normal operation occurs when the engine is running and the
engine diagnostics idle switch is off.
Engine Control System Switches and
Indicator Lights
Engine Diagnostics/Idle Switch (+/-)
This switch is a two position (+/-) momentary rocker switch
on the right side panel in the carrier cab. It provides idle-
control inputs that increase and decrease the engine idle
during normal operating mode, or diagnostic code inputs
when in diagnostic mode.
Regen Initiate/Inhibit Switch
This switch, located on the right side of the front console in
the carrier cab, is used to initiate or inhibit a stationary
exhaust regeneration. The switch must be cycled on and off
to initiate regeneration. The Regen Inhibit Switch is a
maintained ON switch, when selected to manually override
the regen process.
The clutch and brake pedals must also be released. The
engine will automatically change speed as needed. The
cycle will take approximately 20 minutes.
If regeneration (active or stationary) is not desired, press the
inhibit side (bottom) of the switch. The regeneration inhibit
indicator should illuminate. When the switch is in the center
position, the engine will perform an active regeneration as it
requires and is able.
Hand Throttle Switch (Engine Increment/
Decrement Switch)
This switch, located on the right side console in the
superstructure cab, is used to set the engine operating
speed. It is a two position (+/-) momentary switch.
Pushing the top of the switch quickly increases (+) engine
RPM to the maximum allowed operating speed. Pushing the
bottom of the switch quickly decreases (-) engine RPM to
idle speed. Pushing and holding either side of the switch will
increase or decrease engine speed. Releasing the switch
will hold the engine at the current speed. Pressing the foot
pedal will increase engine speed above the “hold” speed.
Releasing the foot pedal causes the engine to return to the
“hold” speed.
Reference Only
To Next Page
Loading...
Need help?
General
