Infiniti I30 (A33). Manual — part 240
9
CHECK HO2S2 (REAR) SHIELD CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect joint connector-17.
3. Check the following.
I
Continuity between joint connector terminal 1 and ground
I
Joint connector
(Refer to EL-525, “HARNESS LAYOUT”.)
Continuity should exist.
4. Also check harness for short to power.
5. Then reconnect joint connector-17.
OK or NG
OK
©
GO TO 10.
NG
©
Repair open circuit or short to power in harness or connectors.
10
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-144.
©
INSPECTION END
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DTC P0139 (BANK 1), P0159 (BANK 2) HO2S2 (REAR) (RESPONSE
MONITORING)
Diagnostic Procedure (Cont’d)
EC-275
SEF327R
Component Description
NHEC0154
The heated oxygen sensor 2 (rear), after three way catalyst
(Manifold), monitors the oxygen level in the exhaust gas on each
bank.
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
NHEC0155
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
HO2S2 (B1)
HO2S2 (B2)
I
Engine: After warming up
Revving engine from idle up to
2,000 rpm
0 - 0.3V
+,
Approx. 0.6 - 1.0V
HO2S2 MNTR
(B1)
HO2S2 MNTR
(B2)
LEAN
+,
RICH
SEF305U
On Board Diagnosis Logic
NHEC0157
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
(Manifold) causes the longer switching time. To judge the malfunc-
tions of heated oxygen sensor 2 (rear), ECM monitors whether the
voltage is unusually high during the various driving condition such
as fuel-cut.
Malfunction is detected when an excessively high voltage from the
sensor is sent to ECM.
DTC P0140 (BANK 1), P0160 (BANK 2) HO2S2 (REAR) (HIGH VOLTAGE)
Component Description
EC-276
Possible Cause
NHEC0441
I
Harness or connectors
(The sensor circuit is open or shorted.)
I
Heated oxygen sensor 2 (rear)
SEF189Y
DTC Confirmation Procedure
NHEC0158
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
NHEC0158S01
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
1,300 - 3,100 rpm
VHCL SPEED SE
64 - 130 km/h (40 - 81 MPH)
B/FUEL SCHDL
0.5 - 6.4 msec
COOLAN TEMP/S
70 - 100°C (158 - 212°F)
Selector lever
Suitable position
6)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-281.
SEF312XB
Overall Function Check
NHEC0159
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.
WITH GST
NHEC0159S01
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 terminal 72 [HO2S2 (B1)
signal] or 71 [HO2S2 (B2) signal] and engine ground.
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DTC P0140 (BANK 1), P0160 (BANK 2) HO2S2 (REAR) (HIGH VOLTAGE)
Possible Cause
EC-277
4)
Check the voltage when racing 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-281.
DTC P0140 (BANK 1), P0160 (BANK 2) HO2S2 (REAR) (HIGH VOLTAGE)
Overall Function Check (Cont’d)
EC-278
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