Direct Electronic Pressure Regulator - Kubota WG1605-E3 Diagnostic Manual

WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, DM

DIRECT ELECTRONIC PRESSURE REGULATOR

(DEPR) (L, N, LN, GL, GLN)
The Direct Electronic Pressure Regulator (DEPR) is
the primary fuel control device, used to maintain both
performance and emissions control. The DEPR contains
an internal computer, which communicates to the
EControls Engine Control Module (ECM), via a
Communications Area Network (CAN), high speed
connection.
The DEPR precisely controls the fuel flow required to
insure Stoichiometric (correct air/fuel mixture for
complete burn) fuel delivery to the engine combustion
chambers. The DEPR also contains internally mounted
fuel pressure and temperature sensors, which provide
input across the CAN link, to the ECM, for fuel
calculation. The ECM will process this information and
command changes back across the CAN link, to the
DEPR, to adjust fueling.
The DEPR internal computer also maintains certain
levels of diagnostics within the system, to ensure
emissions control is always maintained. If the DEPR
detects a fault within the regulator or fuel delivery
system, the DEPR will send that fault information across
the CAN link to the ECM. The ECM will then activate the
Malfunction Indicator Light (MIL), in the operator control
panel. Depending on the type of fault, and its effect on
fuel control, or engine performance, the ECM may
command the DEPR to change fueling, limit fuel
delivery, or in some cases shut down the engine.
The DEPR is connected directly to the mixer on all
certified engines. A special designed inlet fitting, is
mounted to the DEPR, which allows for the connection,
to the DSR. The outlet connection is bolted directly to the
mixer.
The DEPR utilized on USA emission certified
engines is a critical part of the certified emissions
system, and do not require any periodic adjustment.
Figure 15: Direct Electronic Pressure Regulator
(DEPR)
1-49
ECM SYSTEM
KiSC issued 12, 2016 A