Checking The Diodes; Checking The Spark Plug Cap - Yamaha YFM70RY Service Manual

Second step:
3
5
4
2
1
B G Y
Y
L
1. Positive battery terminal
2. Negative battery terminal
3. Positive tester probe
4. Negative tester probe
5. Negative tester probe
Result
No continuity
(between "3" and "4")
Continuity
(between "3" and "5")
Radiator fan motor relay
1. Positive battery terminal
2. Negative battery terminal
3. Positive tester probe
4. Negative tester probe
Result
Continuity
(between "3" and "4")
EAS28050

CHECKING THE DIODES

1. Check:
• Relay unit (diode)
Out of specification → Replace.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
ELECTRICAL COMPONENTS
TIP
The pocket tester or the analog pocket tester
readings are shown in the following table.
Continuity
Positive tester probe → sky
blue"1"
Negative tester probe →
red/black "2"
No continuity
Positive tester probe →
red/black "2"
Negative tester probe → sky
blue "1"
Continuity
Positive tester probe → sky blue
"1"
Negative tester probe → light
green "3"
No continuity
Positive tester probe → light
green "3"
Negative tester probe → sky
blue "1"
Br/G L/W
L/W
M MMM M MMM M M MMM
a. Remove the relay unit from the wire harness.
b. Connect the pocket tester (Ω × 1) to the relay
unit terminals as shown.
c. Check the diode for continuity.
d. Check the diode for no continuity.
L LLL L LLL L L LLL
EAS28060

CHECKING THE SPARK PLUG CAP

1. Check:
• Spark plug cap resistance
Out of specification → Replace.
Resistance
10.0 kΩ at 20 °C (68 °F)
M MMM M MMM M M MMM
a. Remove the spark plug cap from the spark
plug lead.
8-66
1
2
R/B L/B
L/R Br L/G L/Y Sb B/Y
M M MMM M M MMM M
L L LLL L L LLL L
M M MMM M M MMM M
3
R/L
Lg
M MMM M MMM
L LLL L LLL
M MMM M MMM