Yamaha YP250 Service Manual page 255

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YP******
6. Auto choke unit resistance
S Disconnect the auto choke unit coupler from
the wireharness.
S Connect the pocket tester (
auto choke unit coupler lead.
Tester (+) lead ! Black terminal
Tester (–) lead ! Black terminal
Auto choke unit resistance:
16 X 24
YP******
7. Voltage (temperature under 68_C)
S Connect the pocket teser (DC20 V) to the ig-
nitor unit.
Tester (+) lead !
Yellow/Red terminal
Tester (–) lead ! Frame ground
S Turn the main switch to on, and start the en-
gine.
S Check for voltage (12 V) on "Yellow/Red"
terminal at the ignitor unit.
YP******
8. Wiring connection
S Check the connection of the entire auto
choke system.
Refer to "CIRCUIT DIAGRAM" section.
1) to the
1
2
(20_C)
MEETS
SPECIFICATION
(1 terminal)
1
MEETS
SPECIFICATION
AUTO CHOKE SYSTEM
OUT OF SPECIFICATION
Replace the auto choke unit.
OUT OF SPECIFICATION
Replace the ignitor unit.
POOR CONNECTION
Correct.
8-47
ELEC