The engine brake control depends on vehicle con-
figuration. On some vehicles, there is an engine
brake (ENG BRK) switch located in the right-hand
pod on the steering wheel that is used to turn the
engine brake on and off, and an engine brake level
switch on the dash used to set the intensity—high,
medium, or low. See
Fig. 13.4 and Fig. 13.5.
On vehicles equipped with a column-mounted Detroit
multifunction control, the engine brake is controlled
by the lever position, as shown in
Fig. 13.6. At the
top position, the engine brake is off, and at the three
lower positions, the engine brake is on and the inten-
sity (low, medium, high) increases with each step
down.
NOTE: On vehicles equipped with a Detroit mul-
tifunction control, setting the engine brake with
the cruise control set activates Deceleration
Mode. Setting the cruise control while the en-
gine brake is on activates Descent Control
Mode. For information on these modes, see
"Cruise Control" in
Chapter 5.
On vehicles equipped with an engine brake switch in
the right-hand pod on the steering wheel, operate the
engine brake after the engine is warmed up and the
vehicle is in motion, as follows:
1.
Remove feet from both the clutch and accelera-
tor pedals.
2.
Press the upper half of the on/off switch (see
Fig. 13.4) to turn the engine brake on. The en-
gine brake will engage at the rate last set on the
engine brake intensity switch and the engine
brake lamp will illuminate.
ABS
ABS
CHECK
STOP
OPT 2 OPT 4 OPT 5 OPT 6 OPT 9
05/07/2012 f611094
1
6 7 8 9 10 11
12 13 14 15 16 17
18 19 21 22 24 2520 23
2
3
4 5
IDLE
MGMT
BRAKE
1. Engine Brake
2. Optional
3. Wait To Start
4. Check Transmission
5. Optimized Idle
6. CHECK Engine
7. STOP Engine
8. Malfunction Indicator Lamp (MIL)
9. Vehicle ABS
10. Transmission Overheat
11. Trailer ABS
12. Low Engine Oil Pressure
13. High Coolant Temperature
14. Unfastened Seat Belt
15. Park Brake On
16. Diesel Particulate Filter (DPF)
Status
17. High Exhaust Temperature
(HEST)
18. Left-Turn Signal
19. Low Battery Voltage
20. Water In Fuel
21. Driver Message Center
22. High Beams On
23. Brake Air
24. Cruise Control On
25. Right-Turn Signal
Fig. 13.3, ICU3 Message Center (typical)
Brake Systems
13.6
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