Infiniti G20 (P11). Manual — part 212
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6
CHECK SHIELD CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect joint connector-1.
3. Check the following.
I
Continuity between joint connector-1 terminal 2 and ground
Refer to Wiring Diagram.
I
Joint connector-1
(Refer to EL-274, “HARNESS LAYOUT”.)
Continuity should exist.
4. Also check harness for short to power.
5. Then reconnect joint connector-1.
OK or NG
OK
©
GO TO 7.
NG
©
Repair open circuit or short to power in harness or connectors.
7
CHECK INTERMITTENT INCIDENT
Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-146.
©
INSPECTION END
SEF662Y
Component Inspection
NCEC0170
HEATED OXYGEN SENSOR 2 (REAR)
NCEC0170S01
With 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)
Select “FUEL INJECTION” in “ACTIVE TEST” mode, and
select “HO2S2 (B1)” as the monitor item with CONSULT-II.
4)
Check “HO2S2 (B1)” at idle speed when adjusting “FUEL
INJECTION” to
±
25%.
“HO2S2 (B1)” should be above 0.68V at least once when
the “FUEL INJECTION” is +25%.
“HO2S2 (B1)” should be below 0.54V at least once when
the “FUEL INJECTION” is −25%.
CAUTION:
I
Discard any heated oxygen sensor which has been
dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one.
I
Before installing new oxygen sensor, clean exhaust sys-
tem threads using Oxygen Sensor Thread Cleaner tool
J-43897-18 or J-43897-12 and approved anti-seize lubri-
cant.
SEF244Y
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0139 HEATED OXYGEN SENSOR 2 (REAR) (RESPONSE MONITORING)
Diagnostic Procedure (Cont’d)
EC-259
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SEF032X
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 [Heated oxy-
gen sensor 2 (rear) signal] and engine ground.
4)
Check the voltage when 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 above 0.68V at least once.
If the voltage is above 0.68V at step 4, step 5 is not nec-
essary.
5)
Check the voltage when revving up to 6,000 rpm under no
load. Or keep vehicle at idling for 10 minutes, then check the
voltage. Or check the voltage when coasting from 80 km/h (50
MPH) in 3rd gear position (M/T), D position with “OD” OFF
(A/T).
The voltage should be below 0.54V at least once.
CAUTION:
I
Discard any heated oxygen sensor which has been
dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one.
I
Before installing new oxygen sensor, clean exhaust sys-
tem threads using Oxygen Sensor Thread Cleaner tool
J-43897-18 or J-43897-12 and approved anti-seize lubri-
cant.
DTC P0139 HEATED OXYGEN SENSOR 2 (REAR) (RESPONSE MONITORING)
Component Inspection (Cont’d)
EC-260
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SEF327R
Component Description
NCEC0171
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
NCEC0172
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
NCEC0173
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
W
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
SEF305UA
On Board Diagnosis Logic
NCEC0174
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
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)
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0140 HEATED OXYGEN SENSOR 2 (REAR) (HIGH VOLTAGE)
Component Description
EC-261
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SEF189Y
DTC Confirmation Procedure
NCEC0175
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure ” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 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
seconds.
ENG SPEED
1,400 - 3,400 rpm
VHCL SPEED SE
64 - 120 km/h (40 - 75 MPH)
B/FUEL SCHDL
0.5 - 3.9 msec
COOLAN TEMP/S
More than 70°C (158°F)
Selector lever
Suitable position
6)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-264.
SEF032X
Overall Function Check
NCEC0176
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 [Heated oxy-
gen sensor 2 (rear) signal] 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 1.4V during this procedure.
5)
If NG, go to “Diagnostic Procedure”, EC-264.
DTC P0140 HEATED OXYGEN SENSOR 2 (REAR) (HIGH VOLTAGE)
DTC Confirmation Procedure
EC-262
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