um CHILL 125 cc. Service Manual page 34

Malfunction code：P0131/P0132
Information：O2S 1 Circuit Low/High Voltage
ITEM OPERATION
1 Connect the diagnostic tool, and ignition on.
2 Use multimeter to check whether the connection between pin B of the oxygen
sensor and pin J2-17 of the ECU is open, and whether the pin B of sensor is short to
pin A.
3 Crank the engine and stay idle. When the engine gets warm, use multimeter to check
whether the voltage between pin A and B keeps jumping between 100-900mV.
4
A、emission pipe: block/leakage or not.
B、injector: leakage or not
C、fuel pressure too big or not
D、 valve clearance is too small or not
CHILL 125 cc. SERVICE MANUAL AND EFI DIAGNOSTIC
RESULT
Yes
No
Yes
No
Yes
No
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34