CONTROLS/INSTRUMENTS
2 - 12
Caution: Operating the vehicle when the read-
ing is below 1/8 full is not recommended.
18. Oil pressure gauge
Indicates engine oil pressure. Normal reading at
operating temperature should vary from 50 to 70
psi (345 to 483 kPa) at cruising speed.
19. Voltmeter
Indicates electrical system voltage. With engine
operating, normal reading should be 27.5 volts.
20. Transmission oil temperature gauge (op-
tional)
Indicates transmission oil temperature. Normal
reading can vary from 160 to 250°F (70 to 120°
C).
Note: For vehicles equipped with a transmis-
sion retarder, when retarder is operated for ex-
tended periods, it is possible and still acceptable
that transmission oil temperature rises above
250
°
F
(120°
C)but must not exceed 330
°
F
(165
°
C).
21. Turbo boost pressure gauge (optional)
Indicates turbo boost pressure in psi. Reading
depends on engine rpm and load conditions.
22. Window ajar (optional)
Will light when any one or several of the vehi-
cle's windows are opened.
23. Preheating system (optional)
Lights when preheating system is turned on.
For systems description, see pages 2-35 & 2-36.
24. Baggage compartment door lock indicator
(optional)
Will light if any one or several of the baggage
compartment doors are unlocked.
25. Output retarder (optional)
Lights when transmission's output retarder is
activated. For system description, see page 4-
5.
26. Antilock braking system (optional)
Lights until vehicle speed reaches 4 mph (7
km/h), and when the antilock braking system is
malfunctioning.
27. Brake light
Lights when brakes are activated.
28. Transmission "DO NOT SHIFT" light
See page 4-6 for description.
29. Check engine
Will light if a minor engine malfunction is de-
tected by the DDEC (Detroit Diesel Electronic
Control) system. This includes any situation
where the engine coolant reaches 217°F
(103°C) because of cooling system problems or
because of situations described on page 2-11
(item # 16). This light will remain illuminated un-
til malfunction is corrected. Furthermore, this
indicator flashes to indicate engine malfunction
codes when the required procedure outlined on
page 5-7 has been performed.
Note: As a light bulb and systems check, this
indicator will illuminate when the ignition switch
is turned "ON". After about five seconds the
light will turn off.
30. Low fuel level (optional)
Lights when approximately 12 U.S. gallons (45
liters) of fuel remains in the tank(*). It is recom-
mended that you do not exceed a distance of 75
miles (120 km) after light has turned on. Light
will illuminate "ON" & "OFF" just before running
out of fuel. Fill tank as soon as possible.
(*)- Applies to 160 U.S. gallon tank. For other op-
tional tank volumes and distances see below:
- 250 U.S. gallons (160 + 90) = 15 U.S. gal-
lons (57 liters), 90 miles (150 km).
- 208 U.S. gallons = 17 U.S. gallons (64 li-
ters), 100 miles (165 km).
- 298 U.S. gallons (208 + 90) = 21 U.S. gal-
lons (80 liters), 126 miles (210 km).
31. Stop engine
Will light when major engine problems occur.
The engine power will automatically begin to de-
crease gradually and will be followed by an
automatic shutdown after 30 seconds. This 30
second delay period may be repeated using the
"Stop Engine Override Switch" outlined further
on page 2-13 (item #5).
Note: Once engine is stopped, it cannot be re-
started until malfunction is corrected.
As a light bulb and systems check, this indicator
will illuminate when the ignition switch is turned
"ON". After about five seconds the light will turn
off.
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