Diagnostic Trouble Code (Dtc) P0132 O2 Sensor Circuit High Voltage (Bank 1 Sensor 1) - Isuzu 1999 RODEO Workshop Manual

DIAGNOSTIC TROUBLE CODE (DTC) P0132 O2 SENSOR CIRCUIT HIGH VOLT-
Circuit Description
The powertrain control module (PCM) supplies a bias
voltage of about 450 mV between the heated oxygen
sensor (HO2S) signal and low circuits. When measured
with a 10 megaW digital voltmeter, this may display as low
as 320 mV. The oxygen sensor varies the voltage within a
range of about 1000 mV when the exhaust is rich, down
through about 10 mV when exhaust is lean. The PCM
constantly monitors the HO2S signal during "Closed
Loop" operation and compensates for a rich or lean
condition by decreasing or increasing injector pulse width
as necessary. If the Bank 1 HO2S 1 voltage remains
excessively high for an extended period of time,
Diagnostic Trouble Code P0132 will be set. DTC P0132 is
a type A code.
Conditions for Setting the DTC
f No related Diagnostic Trouble Codes.
f Engine coolant temperature is above 60°C (140°F).
f "Closed Loop" commanded air/fuel ratio is between
14.5 and 14.8.
f Throttle angle is between 3% and 19%.
All above conditions met for 0.3 seconds or vehicle in
Decelleration Fuel Cut–Off (DFCO) mode for 3 seconds,
and one of the following two conditions met:
f Bank 1 HO2S 1 signal voltage remains above 952 mV
during normal "Closed Loop" operation for a total of
76.5 seconds over a 90–second period.
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
AGE (BANK 1 SENSOR 1)
OR
f Bank 1 HO2S 1 signal voltage remains above 500 mV
during "deceleration fuel cutoff mode" (DFCO)
operation for 5 seconds.
Action Taken When the DTC Sets
f The PCM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.
f The PCM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.
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
trip cycle during which the diagnostic has been run and
the fault condition is no longer present.
f A history Diagnostic Trouble Code P0132 will clear
after 40 consecutive warm–up cycles have occurred
without a fault.
f Diagnostic Trouble Code P0132 can be cleared by
using the Scan Tool's "Clear Info" function or by
disconnecting the PCM battery feed.
Diagnostic Aids
Check the following items:
f Fuel pressure – The system will go rich if pressure is
too high. The PCM can compensate for some
increase. However, if fuel pressure is too high, a
6E1–147
D06RX046