Manitowoc Published 10-01-2012, Control # 045-08 10-29
777 SERVICE MANUAL TROUBLESHOOTING
10
Test 2 – Electric Fuel Control (EFC) Box Test Points
To determine if the correct voltage is available from the hand
and foot throttle, use a digital multimeter to test at the EFC
box. With engine off and power on, verify 7.75 volts DC at
TB1-9, 4.40 volts DC at TB1-10, and 4.50 volts DC at TB1-
11. While in low idle, verify 7.80 volts DC at TB1-9, 4.70 volts
DC at TB1-10, and 4.55 volts DC at TB1-11. Use the engine
as the ground contact when testing at these terminals.
To determine if the correct voltage is available from the
engine RPM transducer, use a digital multimeter to test at the
EFC box. While in low idle, verify 9.25 volts AC is present
between TB1-5 and TB1-6. If this reading is not obtained, the
engine RPM transducer may require servicing. See Test 5.
Item Description Item Description
1 Terminal block TB1 2 EFC relay
TB1 Test Points – EFC for Cummins C330 Engine
TB1-1 Battery (+) TB1-6 Magnetic pick up (0) TB1-11 Remote speed pot (68L)
TB1-2 Battery (-) TB1-7 Shield TB1-12 No contact
TB1-3 Actuator (3EFC) TB1-8 Shield TB1-13 No contact
TB1-4 Actuator (4EFC) TB1-9 Remote speed pot (68J) TB1-14 Gain select
TB1-5 Magnetic pick up (24) TB1-10 Remote speed pot (68K) TB1-15 Gain select
2
1
AA305
FIGURE 10-3
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