G424F(FE) Service Manual 289 Appendix
Manual Override Screens 1 & 2
There are two manual override screens available for
the technician to test for failed components or to
isolate problems during troubleshooting. Manual
overrides can override normal system function
regardless of engine state. Active, suspected and
occurred faults are displayed on each override
screen for quick reference along with the ability to
clear all faults.
Manual Override Screen 1
Components that can be overridden on override
screen 1 include the Main Power Relay, LP fuel
Lock-off, Fuel Select Switch, Electric Fuel Pump (Bi-
Fuel Units), Fuel Trim Valves, O2 Sensor, and the
Cold Start Valve.
Figure 14. Manual Override Screen 1
CAUTION
Be aware of fuel flow and ignition when
performing any manual override of a system
component as engine damage may result.
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