EDI TSG-416, Service Manual

Page: 168 / 228

TSG ‐ 416 Engine Controls
08 ‐ 3

It can be programmed to provide up to four
specific speeds with use of a matching
toggle switch

It can be programmed to provide an infinite
variety of speeds (with customer-specified
minimum and maximum) based on a variable
signal input.

It can be an electronic replacement for a
throttle cable with maximum speed
governing (throttle-bywire).

Or it can switch between throttle-by-wire
and a second fixed or variable input
based on a neutral/ parking brake
signal.
With the GCP system, a laptop and a
communications cable, diagnosis becomes
simpler. The technician can either view engine
data with a real time graphing program, or store
that data into a numeric data file.
Every time a fault is set, the laptop will give you
detailed information about the fault, including:

when it happened

if the fault still exists

a list of essential engine data from the
time of the fault.
It can also display a 10 second graph of critical
engine data, from 8 seconds before the fault
occurred to two seconds after.
With many OEMs using control modules to
control their machinery, the GCP has the ability
to communicate engine data to and receive
commands from other control modules through a
Controller Area Network (CAN) link, with
messages written in the J1939 protocol.
This allows large amounts of data to move
throughout the machine through only two wires,
and can be used to run some module based
gauge packages.
The GCP also carries auxiliary features that can
be programmed to control OEM devices,
allowing the OEM to eliminate components from
their machinery.
The GCP is also equipped with multiple safety
and protection devices that protect the user and
engine from hazards such as:

over speed

over temperature

over voltage

low oil pressure

unauthorized tampering

over cranking starter motor.
The GCP controls the following:

Fuel metering system

Ignition timing

On-board diagnostics for engine
functions
The GCP constantly observes the information
from various sensors. The GCP controls the
systems that affect engine performance. The
GCP performs the diagnostic function of the
system. It can recognize operational problems,
alert the operator through the Malfunction
Indicator Lamp (MIL), and store diagnostic
trouble codes (DTC’s). DTC’s identify the
problem areas to aid the technician in making
repairs.
The GCP supplies either 5 or 12 volts to power
various sensors or switches. The power is
supplied through resistances in the GCP which
are so high in value that a test light will not light
when connected to the circuit. In some cases,
even an ordinary shop voltmeter will not give an
accurate reading because its resistance is too
low. Therefore, a digital voltmeter with at least
10 megohms input impedance is required to
ensure accurate voltage readings. The GCP
controls output circuits such as the fuel injectors,
electronic governor, etc., by controlling the
ground or the power feed circuit through
transistors or other solid state devices.
The GCP is designed to maintain exhaust
emission levels to government mandated
standards while providing excellent operation
and fuel efficiency. The GCP monitors numerous
engine functions via electronic sensors such as
the throttle position (TP) sensor and the heated
oxygen sensor (HO2S).
GCP Inputs (operating conditions read)

Engine Coolant Temperature

Crankshaft Position

Exhaust Oxygen Content

Manifold Absolute Pressure

Battery Voltage

Throttle Position / Electronic Actuator

Fuel Pump Voltage

Intake Air Temperature

Camshaft Position