Briggs & Stratton 076000NG Service & Troubleshooting Manual page 47

TEST 4 - Check Fuel Supply Pressure
1. Install Briggs & Stratton manometer
#19495 as illustrated in (Figure 38) to
verify that fuel pressure is available to the
fuel solenoid. LP or NG fuel supply
pressure should be 7 to 11 inches of
water (in W.C.) at full load with all gas
appliances turned on and operating.
Figure 38
• If the proper fuel pressure is not
present, repair and/or replace the fuel
delivery system, then re-test the fuel
pressure as described above.
• If fuel pressure is acceptable, go to
TEST 5 - Check ECU Inputs.
TEST 5 - Check ECU Inputs
The ECU needs to receive several inputs before
an engine start will occur. It must receive:
• A connection to battery negative (-)
terminal through Pin #10, Wire #0.
• Battery voltage during engine crank at
Pin #15, Wire #14A.
• Battery voltage during engine crank at
Pin #5, Wire #14B.
• Battery voltage at Pin #11, Wire #15A.
• Battery voltage at Pin #3, Wire #56A.
• A frequency signal at Pins #22 and #23
from the engine RPM sensor.
When all of these conditions are present the
ECU will connect Wire #56A and #14B to
ground. This closes the Power Relay to supply
battery voltage to the ignition and engine
alternator, and opens the fuel solenoid.
To Test ECU Inputs:
1. Turn the SYSTEM switch to OFF.
2. Remove the 15 Amp fuse from the system
control panel.
3. Gain access to the system control panel.
SEE HOW TO ACCESS SYSTEM CONTOL PANEL
ON PAGE 17.
4. Disconnect the wiring harness from the
ECU.
5. Set the meter to measure continuity. Insert
one test lead in Pin #10, Wire #0 and the
other test lead to the negative (-) battery
terminal. Continuity should be measured
(Figure 39).
NOTE: When inserting a test lead into the ECU
connector, use caution to not damage terminals.
Figure 39
• If continuity is measured, proceed to
Step 6.
• If no continuity is measured, repair/
replace wiring between Pin #10, Wire
#0and the negative (-) battery terminal.
6. Set the meter to measure DC Voltage.
Connect the positive (+) meter test lead to
Pin #15, Wire #14A, and connect the
negative (-) meter test lead to battery
ground (Figure 40).
15
Figure 40
2
10
43