Quietpact 40G Diagnostic Repair Manual Model 4700 - Generac Parts

Section 7
DIAGNOSTIC TESTS
4. Connect the positive (+) meter test lead to Terminal J2 on the
Engine Controller Circuit Board. Connect the negative (-) test
lead to a clean frame ground.
5. Crank the engine. The meter should indicate battery voltage.
RESULTS:
1. If continuity is measured in Step 2, repair or replace shorted
Wire No. 18 between J1 Connector and Start-Stop Switch.
2. If continuity was measured in Step 3, repair or replace shorted
Wire No. 18 between J1 Connector and remote panel connector.
Test 31 – Check Fuel Solenoid
(Gasoline Units)
DISCUSSION:
If the Fuel Solenoid fails to open, the engine will not
start.
Figure 7-25. – The 4-tab Connector
RESULTS:
1. If the meter Indicated battery voltage, go to Test 30.
2. If battery voltage was NOT indicated in Step 3 but is indicated
in Step 5, check Wire 14 between the 4-tab connector and the
Engine Controller circuit board.
a. Repair, reconnect or replace Wire 14 as necessary.
3. If battery voltage was not indicated in Step 5, replace the
Engine Controller Circuit Board.
Test 30 – Check Wire 18
DISCUSSION:
Wire No. 18 controls sending the STOP signal to the
Engine Controller Circuit Board. If Wire No. 18 contacts
ground it will initiate a shutdown. Coach manufacturers
sometimes install a 15 to 30 foot remote harness.
A ground on Wire No. 18 in a remote harness
can also cause a shutdown.
PROCEDURE:
1. Remove the remote harness connector from the generator and
re-test. If generator continues to run, a short is present in the
remote harness. Repair or replace the remote harness.
2. Remove the J1 connector from the Engine Controller Circuit
Board. Set the VOM to measure resistance. Connect one test
lead to Pin Location J1-14. Connect the other test lead to a
clean frame ground. Infinity should be measured.
3. Connect one test lead to Pin Location J1-15. Connect the other
test lead to a clean frame ground. Infinity should be measured.
PROCEDURE:
Set the Start-Stop Switch to “START”. The Fuel
Solenoid should actuate.
1. Remove the Control Panel cover to access the back side of the
Fuel Primer Switch.
2. Place a hand on the Fuel Solenoid located at the base of the
carburetor bowl.
3. Connect a jumper between the top and bottom terminals of the
fuel primer switch. This will activate the fuel pump and fuel solenoid.
The fuel solenoid should energize and you should be able
to feel and hear it. If the Fuel Solenoid does not operate, proceed
to Step 4.
14
Figure 7-26. – Connector 3, Fuel Solenoid to Panel
4. Set the VOM to measure DC voltage. Disconnect Connector 3
from the Fuel Solenoid. Connect the positive (+) meter test lead
to Wire No. 14 (Connector 3, Pin 2) that goes to the control
panel. Connect the other test lead to a clean frame ground. Set
the Start-Stop Switch to “START.” Battery voltage should be
measured.
5. Set the VOM to measure resistance. Disconnect Connector 3
from the Fuel Solenoid. Connect one test lead to Wire No. 0
0
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