Air Cleaner Restriction Indicator; Fuel Pedal; Fuel Pedal Adjustment; Potentiometer - PREVOST H3-41 Maintenance Manual

SECTION 03 : FUEL SYSTEM
surface of the housing must be cleaned with
a soft clean cloth;
6. Periodically inspect the entire system. Dust-
laden air can pass through an almost
invisible crack or
eventually cause damage to an engine;
7. Never operate the engine without an element
in the air cleaner assembly;
CAUTION
Do not ignore the Warning given by the air
restriction indicator. This could result in
serious engine damage.
8. Store new elements in a closed area free
from dust and possible damage.
8.4 AIR CLEANER RESTRICTION
INDICATOR
A resettable restriction indicator may be installed
on the engine air-intake duct, clearly visible from
the rear engine compartment.
monitors the vacuum level between the air
cleaner and the engine. A red marker is
displayed when the air cleaner is clogged and
must be replaced. Reset by pressing on the
indicator's extremity.
FIGURE 15: RESTRICTION INDICATOR
MAINTENANCE
Air cleaner
Change the filter element when indicated by
the restriction indicator or at the intervals
specified by the Lubrication And Servicing
Schedule in Section 24: LUBRICATION &
SERVICING.
16
PA1615 Maintenance Manual All Series
opening which may
The indicator
01052
|
Section 03 revised September 2016

9. FUEL PEDAL

The EFPA (Electronic Foot Pedal Assembly)
connects the accelerator
potentiometer (a device that sends an electrical
signal to the ECM, which varies in voltage,
depending on how far down the pedal is
depressed). The EFPA is installed in the space
normally occupied by a mechanical foot pedal.
It has maximum and minimum stops that are
built into the unit during manufacturing.

9.1 FUEL PEDAL ADJUSTMENT

The EFPA contains a throttle position sensor
that varies the electrical signal sent to the ECM.
The sensor must be adjusted whenever an
EFPA is serviced. In addition, the sensor should
be adjusted any time codes 21 and 22 are
flashed.
With the ignition "ON" and the proper diagnostic
tool (DDR) (for information regarding the DDR,
see "01 ENGINE" in this manual), check the
throttle counts at idle and full throttle positions.
Proper pedal output should be 20/30 counts at
idle and 200/235 at full throttle. If adjustment is
necessary, remove the potentiometer retaining
screws and rotate the potentiometer clockwise
to increase counts or counterclockwise to
decrease. When correct output is confirmed,
tighten retaining screws.
9.2 POTENTIOMETER REPLACEMENT
1. Disconnect cable harness connector.
2. Loosen the two
potentiometer. Retain for re-assembly.
3. Discard potentiometer (Figure 16).
CAUTION
Note the routing and clamping locations of the
cable before disassembly. Proper cable
routing and fastening is critical to the
operation of this system.
pedal to a
screws and remove