Generac Power Systems NP-40G - Manual (Page 112)

Section 7.2- ENGINE DC CONTROL SYSTEM
Test 17- Check ignition Power
Suppiy
DISCUSSION:
During startup, the Engine Controller circuit
board delivers DC power to the Ignition Module via
Wire 14. If the engine cranks but won’t start, one
possible cause Is loss of this power supply.
The DC power from the Engine Controller board
is delivered to a 4-tab terminal connector. From that
connector, it is routed to the Ignition Module.
These components are ail housed In the control
panel.
TEST PROCEDURE:
In the control panel, inspect the Wire 14 connec­
tions at the 4-tab connector. Check Wire 14. Check
the power supply as follows:
1. Set a VOM to read battery voltage.
2. Connect the VOM test leads across the 4-tab
connector and frame ground.
3. Hold the engine Start-Stop switch at "START".
The meter should read batte^ voltage.
RESULTS:
1. If DC voltage is NOT indicated, go to Test 21.
2. If pc voltage is good, go on to Test 18.
Test 18- Check ignition Sensor
DISCUSSION:
Refer to Section 6.4, “ENGiNE IGNITION SYSTEM".
TEST PROCEDURE:
See Section 6.4.
RESULTS:
1. Replace Sensor, if bad.
2. If Sensor checks good, go to Test 19.
Test 19- Check ignition Coii
DISCUSSION:
See Section 6.4, "ENGINE IGNITION SYSTEM".
TEST PROCEDURE:
See Section 6.4.
RESULTS:
1. Replace ignition Coll if bad.
2. If coil Is good, go to Test 20.
Test 20- Test ignition Moduie
DISCUSSION:
See Section 6.4, "ENGINE IGNITION SYSTEM".
TEST PROCEDURE:
Refer to Section 6.4.
RESULTS:
Replace Ignition Module if bad.
Test 21- Check Engine Controiier
Board Output to Wire 14
DISCUSSION:
if the engine cranks when the Start-Stop switch
is set to "START", battery voltage must be available
to the Engine Controller circuit board.
if the engine cranks tiut won’t start, it Is possible
that a failure in the circuit board has occured and
DC power is not being delivered to the Wire 14
circuit
This test will determine if circuit board action will
deliver battery voltage to the necessary engine
components.
PROCEDURE:
Set a VOM to read battery voltage. Connect the
meter test leads across Terminal J2 of the Engine
Controller board and Pin 12 of the circuit board
connector (to which common ground Wire 0 con­
nects). Crank the engine and the meter should read
batteiV voltage.
RESULTS:
1. If DC voltage was NOT indicated In Test 17, but
IS indicated now, repair, reconnect or replace Wire
14 between board and Ignition Module.
2. If no DC voltage in Tests but good voltage now,
replace Wire 14 between board and fuel pump.
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