Zone
Start
Models MPlZPR, M21ZMR
NO
SPARK
FOR
ALL
TESTS
Have Lawn-Boy Test Plug, Part
No.
426814
installed
Grass catcher installed and fully seated at chute interlock switch
Hold blade control bail engaged
Check for spark
SPARK
System ok
NO
SPARK
Disconnect yellow wires at brake
Note: Wires must not be grounded
during test.
Check for spark
switch teminal
I
SPARK
I
NO
SPARK
Repair/Replace brake switch Reconnect yellow wires at
NOTE:
Look
for
moisture
or
debris on
brake switch terminal
switch. Clean and blow
dry
Disconnect chute interlock switch
Check for spark
I
SPARK NO SPARK
Replace chute interlock switch
Reconnect chute interlock switch
NOTE: Stainless steel mounting screw
Check/Clean ground terminal at CD
must be used.
Ignition Module or governor bracket
screw
Check high tension lead
Check for spark
I
SPARK
NO
SPARK
System
ok
Disconnect yellow wire at CD Ignition
Module
Check for spark
SPARK
NO
SPARK
Inspect wire harness for pinched, shorted Replace
CD
Ignition Module
or grounded wires Repair/Replace