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General Description
The process consists of attaching dummy loads in
place of the suspension pressure sensors and
checking the pressures indicated by the payload
meter. In addition, connecting to the payload meter
using a laptop PC in order to confirm the latest soft-
ware version and the rest of the inputs and outputs of
the system.
Tools Required
• Payload Data Manager software
• EF9160 - Download Harness
• EJ3057 - Harness Str, PLMIII test (4 needed).
Checkout Procedure
1. Attach one EJ3057 harness to the left-front sus-
pension connection box. The red alligator clip
attaches to the 39F circuit at TB42-A. The white
alligator clip attaches to the 39FD circuit at
TB42-B. The EJ3057 acts as a dummy load to
simulate a suspension pressure sensor for the
payload system.
2. Attach one EJ3057 harness to the right-front
suspension connection box. The red alligator
clip attaches to the 39F circuit at TB41-A. The
white alligator clip attaches to the 39FC circuit
at TB41-B.
3. Attach one EJ3057 harness to the left-rear sus-
pension connection in the rear suspension con-
nection box. The red alligator clip attaches to
the 39F circuit at TB61-A. The white alligator
clip attaches to the 39FB circuit at TB61-C.
4. Attach one EJ3057 harness to the right-rear
suspension connection in the rear suspension
connection box. The red alligator clip attaches
to the 39F circuit at TB61-A. The white alligator
clip attaches to the 39FA circuit at TB61-B.
5. In the PLMIII junction box, check the input volt-
age on circuit 39G between TB45-B and TB45-
X. This voltage should be 24vdc from the batter-
ies.
6. Turn the key switch ON. The speedometer/dis-
play gauge on the dashboard will scroll the
truck type across the lower display. The payload
meter defaults to 930E.
7. In the PLMIII junction box, check the sensor
supply voltage on circuit 39F between TB46-L
and TB45-X. This voltage should be 18vdc
±1vdc.
M20008 02/05
PLMIII CHECK OUT PROCEDURE
Payload Meter III
8. Return to the cab and check the speedometer/
display gauge. The gauge will display the cur-
rent payload. With the EJ3057 harnesses
attached at the sensor locations, the payload
should be 0.
NOTE: The display can be used to quickly show the
current readings from the four suspension pressure
sensors and the inclinometer. This can be used
during regularly scheduled service periods to check
the state of the suspensions. These displays are live
and will update as the values change. The display is
changed by pressing the 'SELECT' button on the
dashboard. The sequence of displays is:
PL
·
= Payload
Id
·
= Operator ID
tL
·
= Total Shift Tons
LC
·
= Shift Load Counter
LF
·
= Left Front Suspension Pressure
rF
·
= Right Front Suspension Pressure
Lr
·
= Left Rear Suspension Pressure
rr
·
= Right Rear Suspension Pressure
In
·
= Inclinometer
NOTE: The live displays cannot be cleared and the
SET button will have no effect.
NOTE: The units for the display are controlled by the
configuration of the payload meter. The payload
meter defaults to display metric units, the pressures
will be displayed in tenths of kg/cm
202
the display shows
the actual value is 20.2 kg/
2
cm
. If the payload meter is set to display short tons,
the pressures will be displayed in psi (lbs/in
2
convert from kg/cm
to psi, multiply by 14.2233.
2
14.2233 psi (lbs/in
) = 1 kg/cm
NOTE: The inclinometer displays whole degrees of
incline. Positive incline is when front of truck is point-
ing up.
2
. For example, if
2
). To
2
.
M20-53
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