DTC P0136 HEATED OXYGEN SENSOR 2 (REAR) (CIRCUIT); Component Description; CONSULT-II Reference Value; ECM Terminals and Reference Value; On Board Diagnosis Logic
EF & EC-7129spec tableSource typos: "sensor 1 (rear)" in OBD logic and check items (should be "sensor 2 (rear)"); "grond".
CG10, CGA3
Component Description
The heated oxygen sensor 2 (rear), after three way catalyst, monitors the oxygen level in the exhaust gas.
Even if switching characteristics of the heated oxygen sensor 1 (front) are shifted, the air fuel ratio is controlled to stoichiometric, by the signal from the heated oxygen sensor 2 (rear).
This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions.
CONSULT-II Reference Value in Data Monitor Mode
Specification data are reference values.
CONSULT-II Data Monitor — HO2S2
HO2S2 (B1)
CONDITIONEngine: After warming up — [Engine is running] After warming up to normal operating temperature and revving engine from idle to 2,000 rpm
SPECIFICATION0 - Approximately 1.0V
HO2S2 MNTR (B1)
CONDITIONEngine: After warming up — [Engine is running] After warming up to normal operating temperature and revving engine from idle to 2,000 rpm
SPECIFICATION0 - Approximately 1.0V
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 2 (Rear)
39
Wire colorW/R
ItemHeated oxygen sensor 2 (rear)
Condition[Engine is running]
- After warming up to normal operating temperature and engine speed is 3,000 rpm
Data (DC Voltage)0 - Approximately 1.0V
On Board Diagnosis Logic
Under the condition in which the heated oxygen sensor 1 (rear) signal is not input, the ECM circuits will read a continuous approximately 0.47V. Therefore, for this diagnosis, the time that output voltage is within 0.4 to 0.52 V range is monitored.