um CHILL 125 cc. Service Manual page 37

4 Use multimeter to check whether the resistance of the two coil pins is 0.5-0.65Ω
@20℃
5 Use multimeter to check whether the voltage of pin B is about 12V.
6 Check whether the connection of pin 2 of the coil and J2-01 of ECU is open or short to
battery/ground.
Malfunction code：P0505
Information：Idle Speed Control Error
ITEM OPERATION
1 Connect the diagnostic tool, and ignition off
2 Remove the connector. Use multimeter to check whether the resistance between pin
A and pin D, pin B and pin C is about 53±5.3Ω
3 Check whether the 4 wires are short to battery/ground or open.
CHILL 125 cc. SERVICE MANUAL AND EFI DIAGNOSTIC
Yes
No
Yes
No
Yes
No
RESULT
Yes
No
Yes
No
Change coil
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Harness issue
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Change stepper motor
Harness issue
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