2–11 62-11637
Figure 2.7 Power Control Module
1. Fuse (F5=30 amp), Power Enable Relay
2. Fuse (F1=5 amp), Main Microprocessor/Buzzer
Power
3. Fuse (F3=5 amp), Stepper Valve/Engine Con-
trol Unit Power
4. Relay, Power Enable
5. Relay, Fuel Heater
6. Buzzer (B)
7. Relay, AutoFresh Air Exchanger
8. Fuse (F7 = 80 amp) Main Power
9. Battery Positive Connection (T1)
10. Battery Negative Connection (T2)
11. Fuse (F6), AutoFresh Air Exchange
12. Alternator Output Connection (T3)
13. Engine Preheater Power Connection (T4)
14. Fuse (F14 = 15 amp), Fuel Heater
15. Fuse (F12 = 5 amp), Satellite Comm. Power
16. Fuse (F11 = 5 amp), Light Bar
17. Fuse (F10 = 20 amp), Relay Power
18. Fuse (F8 = 5 amp), Fuel Level Sensor
- - - - -
a. Power Control Module
The power control module (PCM - see Figure 2.7) is
responsible for distribution of power from the battery to
the system components, when starting, and then from
the alternator to the system components and to the
battery (for charging) once the unit has started.
The module houses the system relays, fuses and the
current transformer (CT). The current transformer is
located within the PCM and provides a reading of the
total 12 VDC system current draw (amps) to the main
microprocessor at terminal 2MM12 (see schematic dia-
gram, Section 10)
b. Main Microprocessor Module
The main microprocessor module (MM) houses the
main system microprocessor, is totally self contained,
and does not contain any serviceable components.
c. SVM Module
The stepper valve module (SVM) houses the CSMV &
EVXV operating microprocessor. The SVM communi-
cates with the control system through the CAN network
and also sends information on the position of the door
switch and remote switch be displayed as required and
recorded in the DataLink data recorder. The module is
totally self contained and does not contain any service-
able components.
d. Microprocessor Status LED
Microprocessor activity within the main microprocessor
or SVM Module can be determined by observing the
status LED, located just to the right of the module bar
code. The LED will:
• blink, green in color, once per second to indicate
that the microprocessor is operating correctly
• be off indicating no power to the module
• be on steadily, green in color, to indicate that the
microprocessor is not communicating (check
CAN bus)
• be on steadily, red in color, to indicate an internal
failure or loss of software.
F5
F1
F3
F8
F10
K1
K2
K3
F12
F14
F11
F6 (10 amp) located at the AutoFresh Exchange solenoid harness connector.
F7
1
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3
4
5
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7
8
9
10
11
12
13
14
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