User Manual - Page 237

For 2001 XTERRA.

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SEF327R
Component Description
NGEC0144
The heated oxygen sensor 2 (rear), after three way catalyst, moni-
tors 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.
Under normal conditions the heated oxygen sensor 2 (rear) is not
used for engine control operation.
CONSULT-II Reference Value in Data Monitor
Mode
NGEC0145
Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
HO2S2 (B1)
Engine: After warming up
Revving engine from idle to 3,000
rpm
0 - 0.3V +, Approx. 0.6 - 1.0V
HO2S2 MNTR
(B1)
LEAN +, RICH
ECM Terminals and Reference Value
NGEC0146
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 dam-
age to the ECMs transistor. Use a ground other than ECM terminals, such as the ground.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM CONDITION DATA (DC Voltage)
56 OR
Heated oxygen sensor 2
(rear)
[Engine is running]
After warming up to normal operating temperature
and revving engine from idle to 3,000 rpm quickly
0 - Approximately 1.0V
SEF304U
On Board Diagnosis Logic
NGEC0147
The heated oxygen sensor 2 (rear) has a much longer switching
time between rich and lean than the heated oxygen sensor 1
(front). The oxygen storage capacity before the three way catalyst
causes the longer switching time. To judge the malfunctions of rear
heated oxygen sensor, ECM monitors whether the minimum volt-
age of the sensor is sufficiently low during various driving condi-
tions such as fuel-cut.
DTC No. Malfunction is detected when ... Check Items (Possible Cause)
P0137 The minimum voltage from the sensor does not reach the
specified voltage.
Harness or connectors
(The sensor circuit is open or shorted.)
Heated oxygen sensor 2 (rear)
Fuel pressure
Injectors
DTC P0137 HEATED OXYGEN SENSOR 2 (REAR)
(MIN. VOLTAGE MONITORING)
KA24DE
Component Description
EC-237
FE
CL
MT
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
GI
MA
EM
LC
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