Troubleshooting - Yamaha YJ125S Service Manual

TROUBLESHOOTING

The auto choke system fails to operate.
Check:
1. Lighting coil resistance
2. Auto choke unit resistance
3. Wiring connections
(of the entire auto choke system)
NOTE:
8 Before troubleshooting, remove the follow-
ing part(s):
1. Cover
2. Rear carrier
3. Side cover (right )
Troubleshoot with the following special
tool(s).
Pocket tester
90890-03132 (YU-03112-C)
AUTO CHOKE SYSTEM
EAS00748
1. Lighting coil resistance
8 Disconnect the lighting coil coupler from
the wire harness.
8 Connect the pocket tester (Ω × 1) to the
lighting coil terminal as shown.
Positive tester probe
Negative tester probe
8 Measure the lighting coil resistance.
Lighting coil resistance
0.28 ~0.42 Ω Ω Ω Ω Ω at 20°C
(between yellow/red and ground)
8 Connect the pocket tester (Ω × 1)to the
lighting coil terminal as shown.
Positive tester probe
Negative tester probe
8 Measure the lighting coil resistance.
Lighting coil resistance
0.32 ~0.48 Ω Ω Ω Ω Ω at 20°C
(between white and ground)
8 Is the lighting coil OK?
YES
7-46
-
ELEC
yellow/red 1 1 1 1 1
ground
1
Y/R
W
white 1 1 1 1 1
ground
Y/R
1
W
NO
Replace the lighting coil.
+