Sym RV 250i Service Manual page 71

4. Fuel Injection System
O Sensor
2
G/R
R/O
Confirmed working voltage
B
W
Resistance Confirmation
4-22
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Functional Description:
Use 8 ~ 16V DC power supply, has the 4-pin coupler, a power supply
●
pins for heater; for a heater control pin; signal for a grounding pin; O
for a signal pin.
O Sensor output feedback signal to the ECU fuel ratio control in the
●
2
vicinity of 14.5 ~ 14.7, a closed-loop fuel control.
When the air-fuel ratio control in the near equivalent, CO / HC / Nox to
●
have the highest conversion efficiency.
L/O
Testing Procedures:
1. Voltage confirmed:
Removed O
●
Open the main switch, but not to start engine.
●
R/Y
Use "voltage meter" DC stalls (DCV) to check inlet pressure sensor
●
voltage.
Confirmed working voltage:
●
Volteg meter negative access to the wire harness sensor coupler
2nd pin (Red / Orange).
Voltage meter positive access to the wire harness sensor coupler
first pin (Red / Yellow).
GR
2. Resistance Confirmation:
Remove O Sensor and the wire harness between the coupler.
●
2
Use of the "meter" Ohm stalls, Measurement O
●
resistance.
Measurement resistance value
●
Ohm meter negative access to the O
(White).
W
Ohm meter negative access to the O
(White).
Sensor and the wire harness between the coupler.
2
Sensor heater
2
sensor coupler 2nd pin
2
sensor coupler first pin
2
2