Wittke FEATHERWEIGHT, Maintenance Manual

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Electrical System
63
Ensure that the Labrie system and the chassis system are communicating correctly by checking the
engine RPM as explained earlier.
Checking Control Module (Node) Supply Voltage
A benefit to the IFM multiplex control systems used on W
ITTKE
™ products is the ability to verify
inputs and outputs through the display screen quickly, without the need to connect a diagnostic
reader or laptop PC. However, prior to checking the status of these outputs, the supply power voltage
for each control module (Node) must be checked to ensure that it is at least 12 volts.
Effective on production models manufactured in early 2017, the diagnostic features of the IFM
multiplex control system have been further enhanced; supply voltages for the control modules
(Nodes) may now be checked through the on-board display, as follows:
1) Turn the ignition switch to the “run” position, activating the IFM display.
2) On the IFM display, select “Menu”, then select “I/O Status”.
3) Using the up/down arrows on the directional pad, scroll down and select “Others”.
4) The real-time supply voltages of the control modules (Nodes) will be displayed:
If voltage(s) are below 12 volts, check the supply power to the module; if all voltages are below
12 volts, check the chassis battery voltage.
This helps diagnose error messages such as a module disconnected or functions of a module not
receiving their outputs. Once the supply voltages have been verified, further troubleshooting of
various outputs may then be investigated.