Diagnostic Trouble Code (Dtc) P0133 O2 Sensor Circuit Slow Response (Bank 1 Sensor 1) - Isuzu 1999 RODEO Workshop Manual

6E1–150 RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
DIAGNOSTIC TROUBLE CODE (DTC) P0133 O2 SENSOR CIRCUIT SLOW RE-
Circuit Description
The powertrain control module (PCM) continuously
monitors the heated oxygen sensor (HO2S) activity for 90
seconds after "Closed Loop" has been enabled. During
the monitoring period the PCM counts the number of
times that a rich–to–lean and lean–to–rich response is
indicated and adds the amount of time it took to complete
all transitions. With this information, an average time for
each transition can be determined. If the average
response time is too slow, a Diagnostic Trouble Code
P0133 will be set. A DTC P0133 is a type B code.
A lean–to–rich transition is indicated when the HO2S
voltage changes from less than 300 mV to greater than
600 mV. A rich–to–lean transition is indicated when the
HO2S voltage changes from more than 600 mV to less
than 300 mV. An HO2S that responds too slowly is likely
to be faulty and should be replaced.
Conditions for Setting the DTC
f No related Diagnostic Trouble Codes.
f Engine coolant temperature is greater than 60°C
(140°F).
f Engine is operating in "Closed Loop".
f Engine has been running for at least 2 minutes.
f Engine speed is between 1500 RPM and 3500 RPM.
f Canister purge solenoid duty cycle is greater than 2%.
f Calculated air flow is between 17 and 32 g/second.
SPONSE (BANK 1 SENSOR 1)
All above conditions are met for 1 second and the
following condition is met:
f 90 seconds after "Closed Loop" has been enabled,
Action Taken When the DTC Sets
f The PCM will illuminate the malfunction indicator Lamp
f The PCM will store conditions which were present
f "Open Loop" fuel control will be in effect.
Conditions for Clearing the MIL/DTC
f The PCM will turn the MIL OFF on the third consecutive
f A history Diagnostic Trouble Code P0133 will clear
f Diagnostic Trouble Code P0133 can be cleared by
Bank 1 HO2S 1 average transition time between 300
mV and 600 mV is too slow. The lean–to–rich average
transition response time was longer than 100
milliseconds or rich–to–lean average transition
response time was longer than 105 milliseconds.
(MIL) after the second consecutive trip in which the
fault is detected.
when the Diagnostic Trouble Code was set as Freeze
Frame and in the Failure Records data.
trip cycle during which the diagnostic has been run and
the fault condition is no longer present.
after 40 consecutive warm–up cycles have occurred
without a fault.
using the Scan Tool's "Clear Info" function.
D06RX046