freightliner WALK-IN VAN CHASSIS Operator's Manual page 132

Hydraulic Hybrid
If the propulsion system ready indicator does not illu-
minate, the message START ENGINE will appear on
the message display screen and the hydraulic hybrid
system will not allow the transmission to shift until
the system is charged. To charge the system, the
engine must be running in order to drive the primary
pump to pressurize fluid in the high pressure accu-
mulator. Turn the ignition to the START position to
start the engine. When the engine starts, WAIT will
appear in the message display screen. The WAIT
message will disappear and the propulsion system
ready indicator will illuminate once the charging pro-
cess is complete. The engine will turn off as long as
the engine coolant is at the proper operating tem-
perature.
Shift Inhibit Indicator
The amber shift inhibit indicator illuminates whenever
all conditions for safe transmission shifting have not
been met. SHIFT INHIBIT will also appear in the
message display screen when the indicator illumi-
nates. See Fig. 16.11 for an example of the shift in-
hibit indicator. The shift inhibit indicator will illuminate
due to one or more of the following conditions:
•
The propulsion system ready indicator is not
illuminated.
•
The temperature of the hydraulic fluid is less
than 0°F (–18°C).
•
A transmission shift is attempted when the ve-
hicle's speed is above 5 mph (8 km/h). When
this occurs, the gearbox will be forced to shift
into neutral (N) and the current gear will dis-
play N on the shift pad. The selected gear will
continue to flash on the shift pad until either
the previous gear or neutral (N) is selected.
The indicator and message will turn off, and the
transmission can be shifted when all of the following
conditions are met:
•
The propulsion system ready indicator illumi-
nates.
•
The temperature of the hydraulic fluid is 0°F
(–18°C) or higher.
•
Vehicle speed is below 5 mph (8 km/h).
Low Traction Control Indicator
The amber low traction indicator illuminates when
wheel slippage is detected by the HCM. See
16.9
Fig. 16.11 for an example of the low traction control
indicator. LOW TRACTION will appear on the mes-
sage display screen. The hybrid system will reduce
power output until slippage is no longer detected.
Message Displays
The hydraulic hybrid vehicle uses the same instru-
ment panel, by Ametek, as the standard diesel
Walk-In Van. The panel operates the same way un-
less noted otherwise here. See
ments for a detailed description of the Ametek instru-
ment panel.
The following messages can appear on the message
display screen. Brief descriptions for the various
messages follow.
•
low pressure reservoir (LPR) air pressure
•
check transmission/check hybrid
•
stop transmission/stop hybrid
•
hood open
•
hybrid communication fault
•
hydraulic oil filter monitor
•
low traction
•
shift to neutral or park
•
shift inhibit
•
low vehicle battery voltage
Low Pressure Reservoir (LPR) Air
Pressure
LOW LPR AIR PRESSURE will appear on the mes-
sage display screen when LPR pressure falls below
35 psi (241 kPa) and a warning chime will sound.
Check Transmission/Check Hybrid
A message will appear along with the check trans-
mission warning indicator when the transmission con-
trol module (TCM) or the hybrid control module
(HCM) detects a fault in the hydraulic hybrid system.
When the red stop transmission indicator illuminates,
the message center will display STOP TRANS and/or
STOP HYBRID, due to a malfunction in the hydraulic
hybrid system. The vehicle will shut down immedi-
ately, in order to avoid damaging the hydraulic hybrid
system. Contact a certified hydraulic hybrid service
technician to determine the corrective action to take.
Chapter 2, Instru-