Generac Power Systems NP-40G User Manual
Page 105
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Section 7.2- ENGINE DC CONTROL SYSTEM
TEST 15-CHECK
IGNITION SPARK
WEAK OR NO SPARK
SPARK
' G O O D ■
TEST 16-CHECK
SPARK PLUG
GOOD,
TEST 3- CHECK
POWER TO
FUEL PUMP
(NOTE 1)
TEST 17- CHECK
IGNITION POWER
SUPPLY (WIRE 14)
BAD
I
POWER TO PUMP GOOD
BUT PUMP DOESN’T WORK
i
■ GOOD
NO IGNITION
POWER SUPPLY
1
CLEAN AND REGAP
OR REPLACE
SPARK PLUG
REPLACE FUEL PUMP
TEST 18-CHECK
TEST 19-TEST
TEST 20- TEST
IGNITION
...........GOODii^
IGNITION
IGNITION
SENSOR
COIL
MODULE
b
I
d
b
I
d
b
I
d
DML
REPLACE SENSOR
I
REPLACE COIL
NO DC VOLTAGE TO FUEL PUMP ■
\
REPLACE
MODULE
TEST 21- CHECK
ENGINE
CONTROLLER
BOARD OUTPUT
TO WIRE 14
GOOD.
REPAIR RECONNECT
OR REPLACE BAD
WIRE(S)14AS
NECESSARY
NOTE 1:- For units with LP gas fuel
system, check for 12 VDC to the
gaseous fuel lockoff solenoid.
BAD<
REPLACE ENGINE CONTROLLER
CIRCUIT BOARD
f
POWER TO FUEL PUMP IS GOOD AND PUMP OPERATES ■
TEST 22- TEST
AUTOMATIC
CHOKE
GOODai.^
TEST 23- CHECK
CARBURETION
ADJUST OR REPAIR
^ CARBURETOR OR
ENGINE AS NECESSARY
BAD
ADJUST OR REPAIR
CHOKE SYSTEM
Page 7.2-3