Nissan Primera P11. Instruction — part 160
Component Description
NLEC0171
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
NLEC0172
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
HO2S2 (B1)
I
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
NLEC0173
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 ECM’s transistor. Use a ground other than ECM terminals, such as the ground.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
63
L
Heated oxygen sensor 2
(rear)
[Engine is running]
I
After warming up to normal operating temperature
and revving engine from idle to 2,000 rpm
0 - Approximately 1.0V
On Board Diagnosis Logic
NLEC0174
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
heated oxygen sensor 2 (rear), ECM monitors whether or not the
voltage is too high during various driving conditions such as fuel-
cut.
DTC No.
Malfunction is detected when ...
Check Items (Possible Cause)
P0140
0140
I
An excessively high voltage from the sensor is sent to
ECM.
I
Harness or connectors
(The sensor circuit is open or shorted.)
I
Heated oxygen sensor 2 (rear)
SEF327R
SEF305U
DTC P0140 HEATED OXYGEN SENSOR 2 (REAR)
(HIGH VOLTAGE)
QG16
I
18DE
Component Description
EC-197
DTC Confirmation Procedure
NLEC0175
NOTE:
If “DTC Confirmation Procedure ” has been previously conducted,
always turn ignition switch “OFF” and wait at least 9 seconds
before conducting the next test.
With CONSULT-II
1)
Turn ignition switch “ON” and select “DATA MONITOR” mode
with CONSULT-II.
2)
Start engine and drive vehicle at a speed of more than 70 km/h
(43 MPH) for 2 consecutive minutes.
3)
Stop vehicle with engine running.
4)
Let engine idle for 1 minute.
5)
Maintain the following conditions for at least 5 consecutive
minutes.
ENG SPEED
Above 1,500 rpm
VHCL SPEED SE
Above 70 km/h (43 MPH)
B/FUEL SCHDL
Above 2.7 msec
COOLAN TEMP/S
70 - 105°C (158 - 221°F)
Selector lever
Suitable position
6)
If 1st trip DTC is detected, go to “Diagnostic Procedure”, EC-
QG-200.
Overall Function Check
NLEC0176
Use this procedure to check the overall function of the heated oxy-
gen sensor 2 (rear) circuit. During this check, a 1st trip DTC might
not be confirmed.
Without CONSULT-II
1)
Start engine and drive vehicle at a speed of more than 70 km/h
(43 MPH) for 2 consecutive minutes.
2)
Stop vehicle with engine running.
3)
Set voltmeter probes between ECM terminals 63 (HO2S2 sig-
nal) and engine ground.
4)
Check the voltage after revving up to 4,000 rpm under no load
at least 10 times.
(Depress and release accelerator pedal as soon as possible.)
The voltage should be below 2V during this procedure.
5)
If NG, go to “Diagnostic Procedure”, EC-QG-200.
SEF189Y
SEF032X
DTC P0140 HEATED OXYGEN SENSOR 2 (REAR)
(HIGH VOLTAGE)
QG16
I
18DE
DTC Confirmation Procedure
EC-198
Wiring Diagram
NCEC0177
YEC067A
DTC P0140 HEATED OXYGEN SENSOR 2 (REAR)
(HIGH VOLTAGE)
QG16
I
18DE
Wiring Diagram
EC-199
Diagnostic Procedure
NCEC0178
1
RETIGHTEN GROUND SCREWS
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.
SEF994W
©
GO TO 2.
2
CHECK INPUT SIGNAL CIRCUIT
1. Disconnect heated oxygen sensor 2 (rear) harness connector and ECM harness connector.
SEF033X
2. Check harness continuity between ECM terminal 63 and heated oxygen sensor 2 (rear) harness connector terminal 2.
Refer to wiring diagram.
Continuity should exist.
3. Check harness continuity between ECM terminal 63 [or heated oxygen sensor 2 (rear) harness connector terminal 2]
and ground.
Continuity should not exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 4.
NG
©
GO TO 3.
3
DETECT MALFUNCTIONING PART
Check the harness for open or short between heated oxygen sensor 2 (rear) and ECM.
©
Repair open circuit or short to ground or short to power in harness or connectors.
DTC P0140 HEATED OXYGEN SENSOR 2 (REAR)
(HIGH VOLTAGE)
QG16
I
18DE
Diagnostic Procedure
EC-200
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