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ELECTRONIC CONTROL SYSTEM
BAP
APS / IVS
PDC#
Device
F46
5A...ECM KEY PWR
Accelerator Pedal Position
Sensor / Idle Validation Switch
(APS/IVS)
• The APS/IVS sensor has two
components built into one housing:
the Accelerator Pedal Position
Sensor
(APS)
and
Validation Switch (IVS).
• The APS is a potentiometer type
sensor. The ECM supplies a
reference voltage (Vref) and ground
to the potentiometer and the sensor
sends a voltage signal back to the
ECM indicating the pedal position.
The idle validation switch receives
12 volts from the chassis harness
and signals the ECM when the
pedal is in the idle position. If the
ECM detects an APS signal out of
range high or low, the ECM will
ignore the APS signal and operate
at low idle.
36
IN CAB CRUISE SWITCHES
X4-6 COO
X3-14 RAS
X3-21 SCS
X3-24 BAP
X4-18 APS
X4-24 GRD
A
X4-4 V
B
REF
B
X4-12 IVS
C
E
D
PDC
F
TO KEY SWITCH
F46
• If a disagreement in the state of IVS
and APS is detected by the ECM,
and the ECM determines that the
IVS is at fault, the ECM will allow a
maximum of 50% of APS. If the
ECM cannot determine that the IVS
is at fault, the engine will be
restricted to low idle only.
the
Idle
Barometric Absolute Pressure
(BAP) sensor
• The BAP sensor is mounted in the
cab. The BAP sensor provides
altitude information to the ECM, so
fuel quantity and timing, glow plug
on time, intake heater on time, and
the operation of the Boost Control
Solenoid can be adjusted to
compensate
changes.
International
RIGHT BANK INJECTORS
LEFT BANK INJECTORS
ECM
X1
X1
X2
X2
X3
X3
X4
X4
Cruise Control
• Cruise
controlled through the ECM. Two
switches in the cab are used to
signal the operator's intention for
speed control. The switches receive
battery voltage through fuse 46 in
the Power Distribution Center
(PDC). The Cruise On/Off (COO)
switch sends a voltage signal to
ECM pin X4-6. With the COO
switch on, the operator can use the
Set (SCS) and resume (RES)
switch to control the vehicle speed.
for
air
density
®
VT 275 V6 Engine
X1
X1
X2
X2
X3
X3
IDM
EGR
DRIVE
MODULE
BCS
IPR
EGR
VALVE
control
operation
is
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