Electronic Control Module; Electronic Unit Injector; Synchronous Reference Sensor; Figure 2: Electronic Control Module (Ecm) - Detroit Diesel 60 Series Manual

Section 01: ENGINE

2.1 ELECTRONIC CONTROL MODULE

The Electronic Control Module is mounted, on
the starter side of the engine
Considered the "Brain" of the DDEC IV system,
it provides overall monitoring and control of the
engine. It does so by comparing input data from
the various sensors to a set of calibration data
stored in the EEPROM (Electrically Erasable,
Programmable, Read-Only Memory) within the
Electronic Control Module. After comparing the
input data with the calibration data, the ECM
sends high-current command pulses to the
Electronic Unit Injectors (EUI) to initiate fuel
injection. The ECM also receives feedback
regarding the start and end of injection for a
given cylinder. The
Electronic Control Module is factory programmed
by Detroit Diesel. Reprogramming must be done
at a Detroit Diesel authorized service center.
However, some changes may be performed to
the cruise control and road speed limiter using a
diagnostic data reader (see paragraph "DDEC IV
Diagnostic Codes" in this section).

FIGURE 2: ELECTRONIC CONTROL MODULE (ECM)

2.2 ELECTRONIC UNIT INJECTOR

The Electronic Unit Injector is a compact device
that injects diesel
combustion chamber
fuel injected and the Electronic Control Module
(ECM) determines the beginning of injection
timing. The ECM sends a command pulse, which
activates the injector solenoid. The EUI performs
four functions:
•
Creates the high-fuel pressure required for
efficient injection;
(Fig. 2).
EEPROM within
fuel directly into
(Fig. 3). The amount of
• Meters and injects the exact amount of fuel
required to handle the load;
• Atomizes the fuel for mixing with the air in the
combustion chamber;
• Permits continuous fuel flow for component
.
cooling
the

FIGURE 3: UNIT INJECTOR CROSS SECTION

3. SYNCHRONOUS REFERENCE SENSOR

The Synchronous Reference Sensor (SRS) is an
electronic component, mounted to the rear of the
gear case (Fig. 4). The SRS senses a raised
the
metal pin on the rear of the bull gear and sends
a signal to the ECM via a black connector wire.
The SRS sensor extends through a hole in the
gear case. It is positioned near the rear of the
bull gear. A bolt, inserted through a hole in the
SRS bracket, secures the SRS assembly to the
gear case.
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