CHILL 125 cc. SERVICE MANUAL AND EFI DIAGNOSTIC
34
Malfunction code
：
P0131/P0132
Information
：
O2S 1 Circuit Low/High Voltage
ITEM
OPERATION
RESULT
NEXT STEP
1
Connect the diagnostic tool, and ignition on.
next
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.
Yes
Harness issue
No
Next
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.
Yes
Help
No
Next
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
Yes
Engine maintenance
No
Change sensor
