Table of Contents
Advertisement
X1
X1
X2
X2
X3
X3
X4
X4
ECM
BATTERY
TO KEY SWITCH
Pump Operation
• The VT 275 has an ECM controlled
chassis mounted electric fuel pump.
At key-on, the ECM will operate the
fuel pump for up to 60 seconds to
prime the system. Priming allows
the pump to pressurize the system
and to allow air in the system to
bleed out through an orifice
between the filter housing and the
fuel return circuit.
When the engine is in run mode, the
pump will operate continuously. If
the engine dies or is shut down, or
if it is not started within 60 sec-
onds, the ECM will stop the pump.
X3-1 WIF
X4-15 FPM
X3-9 FPC
2
1
TO
RUN / ACC
RELAY
200 A
2
FUEL HEATER RELAY
1
Circuit Operation
• To operate the pump, the ECM
provides a ground at ECM pin X3-9
to latch the fuel pump relay. The
relay takes power from fuse F11
and provides it to pin 1 of the pump
connector. The ECM monitors the
relay's operation through ECM pin
X4-15. Battery voltage should be
present at X4-15 when the relay is
commanded on. If the ECM does
not detect the voltage, a DTC will
be logged.
Fuel Heater
• The Horizontal Fuel Conditioning
Module (HFCM) contains a fuel
heater. When the key is ON, the fuel
heater relay latches and provides
power to pin 1 of the heater
connector. The heater element
contains
a
controls the heater operation.
International
ELECTRONIC CONTROL SYSTEM
PDC
5
TO
FUEL
IGNITION
PUMP
POWER
RELAY
3
F11
F19
5
3
GRD
Water-In-Fuel Sensor
• The pump module contains a
Water-In-Fuel (WIF) sensor. The
WIF sensor receives voltage from
the key switch. If the filter detects
water, the sensor sends the voltage
to ECM pin X3-1. The ECM then
activates the dash WIF lamp.
thermostat
that
®
VT 275 V6 Engine
PDC#
Device
F11
20A...FUEL PUMP
F19
20A...FUEL HEATER
HFCM
1
2
2
HEATER
1
2
PUMP
1
35
Advertisement
Table of Contents
