Yamaha XT660R S Service Manual page 448

EAS00842
3. Fuel sender (thermistor)
• Disconnect the fuel sender coupler from
the wire harness.
• Connect the pocket tester (kΩ × 1) to the
fuel sender as shown.
Positive tester probe → green/white 1
Negative tester probe → black 2
• Check the fuel sender for continuity.
• Is the fuel sender OK?
YES
Replace the meter
assembly.
NO
Replace the fuel
pump assembly.
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