DESCRIPTION SERVICE MANUAL NUMBER 22
Page 5A-26 90-860074--1 FEBRUARY 2002
Fuel Management
Control
As stated previously, the Electronic Diesel Injection (EDI) is controlled by an Engine Control
Module (ECM). This module is the nerve/decision center of the system. It uses all the
information it gathers to manage and deliver increased fuel economy and maximum engine
performance.
The EDI system has been designed so that the ECM controls the injected quantity and
timing by the ECM. This electronic control allows the ECM to maintain optimum engine
performance and the lowest exhaust emissions possible.
Recall that the EDI system uses inputs from sensors to make decisions on the quantity of
fuel and amount of pump timing advance or retard allowed.
In order for the ECM to properly calculate advance, it must always know the engine speed.
The ECM also performs a diagnostic function check of the system. It can recognize
operational problems and store a code or codes, which identify the problem areas to aid the
technician in making repairs.
75343
Engine Control Module (ECM)
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