ELECTRIC SYSTEM 16000 SERVICE/MAINTENANCE MANUAL
3-30
Published 05-03-17, Control # 228-03
CHECKING ELECTRICAL INPUTS/OUTPUTS
See Figure 3-4 for the following procedure.
Troubleshoot components on the main display first. Any
further testing should be completed with in-line test boards at
the universal nodes. The in-line test boards can be ordered
from the Manitowoc Crane Care Lattice Team.
The node number and pin numbers for each component to
be checked are contained in the node Test Volt tables.
To test a problem component at a universal node with an in-
line test board, use the following:
1. Shut down the engine and turn the engine key switch to
the run position.
2. Determine the universal node (3 through 5) and keyed
connector (W3, W4, or W6) where the problem
component is located.
3. Remove the cable to the correct connector and insert
the keyed in-line test board between the cable and
universal node. At least one cable to the node computer
must remain connected when testing.
4. Determine the wire number(s) of the item to be checked.
5. To test for the correct voltage, use the following:
a. Close the knife switch across the test terminal on
the board.
b. Select voltage on the meter.
c. Connect the meter negative lead to the problem
component ground terminal on the test board.
d. Connect the meter positive lead to the problem
component signal terminal on the test board.
e. Enable the test component and check the voltage
reading on the meter.
NOTE: A meter reading of 9 volts can indicate an output is
turned on and is an open circuit. A meter reading of
3 volts can indicate that a circuit is turned off and is
an open circuit.
6. To test for the correct amperes, use the following:
a. Open the knife switch across the test terminal.
b. Select amperes on the meter.
c. Connect the meter leads across the test board
problem component terminal.
d. Enable the test component and check the ampere
reading on the meter.
7. To test for a communication problem, use the following:
a. Make sure the engine is off and the engine key
switch is in the run position, with all brakes and
locks engaged.
b. Access the desired node to install the
communication in-line test board.
c. Remove the cable from the node at the W1 or W7
connector.
d. Connect the communication in-line test board
between the cable and universal node connector.
e. Check from terminal C (CAN high) to D (ground) or
from terminal F (CAN low) to D (ground).
NOTE: A reading of 1 to 3 volts indicates normal
communication between nodes. A steady reading
of 0 or 2.5 volts can indicate no communication on
the CAN Bus.
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