DTC P0131 HEATED OXYGEN SENSOR 1 (FRONT) (LOW VOLTAGE); Component Description; CONSULT-II Reference Value; ECM Terminals and Reference Value
EF & EC-7105spec tableP0131 (LOW VOLTAGE) HO2S1 MNTR spec says "5 times during 10 seconds" vs P0130 page (EF & EC-7100) which says "3 times" — preserved verbatim. Caution typo "grond" preserved.
CG10, CGA3
Component Description
The heated oxygen sensor 1 (front) is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 (front) has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 (front) signal is sent to the ECM. The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1V to 0V.
CONSULT-II Reference Value in Data Monitor Mode
Specification data are reference values.
CONSULT-II Data Monitor — HO2S1
HO2S1 (B1)
CONDITIONEngine: After warming up — Maintaining engine speed at 2,000 rpm
SPECIFICATION0 - 0.3V ↔ Approx. 0.6 - 1.0V
HO2S1 MNTR (B1)
CONDITIONEngine: After warming up — Maintaining engine speed at 2,000 rpm
SPECIFICATIONLEAN ↔ RICH
Changes more than 5 times during 10 seconds.
ECM Terminals and Reference Value
Specification data are reference values and are measured between each terminal and ground.
CAUTION
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a grond other than ECM terminals, such as the ground.
ECM Terminals — Heated Oxygen Sensor 1 (Front)
12
Wire colorB/R
ItemHeated oxygen sensor 1 (front)
Condition[Engine is running]
- After warming up to normal operating temperature and engine speed is 2,000 rpm
Data (DC Voltage)0 - Approximately 1.0V (waveform SEF008W)