Organizational Troubleshooting (continued)
TEST OR INSPECTION
Reading obtained in step j at 20 percent rpm should be at
least 10 psig higher than reading obtained in step g at 20
percent rpm. Replace FCU if reading obtained is less than 10
m. Start engine and note readings on pressure gauge. At no-load
condition reading should be between 230 and 250 psig. At
full load reading should be between 250 and 280 psig.
n. After engine shutdown, disconnect pressure gauge, remove tee,
and reconnect fuel line removed in step d.
FUEL SHUTDOWN SOLENOID MALFUNCTION.
If the fuel shutdown solenoid is suspected of malfunction, test the solenoid
a. Disconnect battery. Disconnect electrical connector from
Check resistance between pins A and B of fuel solenoid.
Resistance should be 25 to 35 ohms. If not, replace solenoid
If solenoid is good check wire G78A20 from P4-8 to P2-U. If
CONTROL PANEL WIRING HARNESS DIODE MALFUNCTIONS.
Diodes are installed in some wires in the control panel harness. If these
diodes are suspected of malfunctioning, test the diodes as follows:
Disconnect battery and lower control panel.