O2 Sensor - TGB EST 1000 Service Manual

O2 Sensor

Confirmed working voltage
Resistance Confirmation
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; O2
for a signal pin.
● O2 Sensor output feedback signal to the ECU fuel ratio control in the
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.
Testing Procedures:
1. Voltage confirmed:
● Removed O2 Sensor and the wire harness between the coupler.
● Open the main switch, but not to start engine.
● Use "volteg 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 (Gray/Red ).
Voltage meter positive access to the wire harness sensor coupler first
pin (Red ).
2. Resistance Confirmation
● Removed O2 Sensor and the wire harness between the coupler.
● Use of the "meter" Ohm stalls, Measurement O2 Sensor heater
resistance.
● Measurement resistance value
Ohm meter negative access to the O2 sensor coupler 2nd pin (White).
Ohm meter negative access to the O2 sensor coupler first pin (White).
Detection judge:
● Working voltage value:
above 10V
● Resistance
value:15±2Ω
Treatment of abnormal phenomena:
● O2 sensor damage, heater damaged or couplers to poor contact.
● Check whether the abnormal wire harness lines.
● O2 Sensor anomaly, the proposed replacement of the O2 Sensor，and
measurements again.
4-2. FUEL INJECTION SYSTEM
:
4-2-23