6E1–168
RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
DIAGNOSTIC TROUBLE CODE (DTC)
P0137 O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2)
060R100031
Circuit Description
To control emissions of hydrocarbons (HC), carbon
monoxide (CO), and oxides of nitrogen (NOx), a
three–way catalytic converter is used. The catalyst within
the converter promotes a chemical reaction which
oxidizes the HC and CO present in the exhaust gas,
converting them into harmless water vapor and carbon
dioxide. The catalyst also reduces NOx, converting it to
nitrogen. The powertrain control module (PCM) has the
ability to monitor this process using the Bank 1 HO2S 1
and the Bank 1 HO2S 2 heated oxygen sensors. The
Bank 1 HO2S 1 sensor produces an output signal which
indicates the amount of oxygen present in the exhaust
gas entering the three–way catalytic converter. The Bank
1 HO2S 2 sensor produces an output signal which
indicates the oxygen storage capacity of the catalyst; this
in turn indicates the catalyst’s ability to convert exhaust
gases efficiently. If the catalyst is operating efficiently, the
Bank 1 HO2S 1 signal will be far more active than that
produced by the Bank 1 HO2S 2 sensor. If the Bank 1
HO2S 2 signal voltage remains excessively low for an
extended period of time, Diagnostic Trouble Code P0137
will be set. DTC P0137 is a type A code.
Conditions for Setting the DTC
D
No related Diagnostic Trouble Codes.
D
Engine is operating in ”Closed Loop”.
D
Engine coolant temperature is above 60
°
C (140
°
F).
D
”Closed Loop” commanded air/fuel ratio is between
14.5 and 14.8.
D
Throttle angle is between 5.9% and 50%.
All above conditions met for 0.3 seconds or for 3.0
seconds, if in ”Decelleration Fuel Cut–Off” (DFCO)
mode, and the following two conditions are met:
D
Bank 1 HO2S 2 signal voltage remains below 22 mV
during normal ”Closed Loop” operation for a total of
106.25 seconds over a 125–second period of time.
OR
D
Bank 1 HO2S 2 signal voltage remains below 426 mV
during power enrichment (P.E.) mode fuel control
operation for 5 seconds.
The above conditions are met for 190 test failures in 220
test samples or 40 failures in 40 samples in P.E. mode
(125 msec/test).
Action Taken When the DTC Sets
D
The PCM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.
D
The PCM will store conditions which were present
when the Diagnostic Trouble Code set as Freeze
Frame and in the Failure Records data.