Infiniti I30 (A33). Manual — part 219
4
CHECK ENGINE COOLANT TEMPERATURE SENSOR
Check resistance between engine coolant temperature sensor terminals 1 and 2 as shown in the figure.
SEF304X
OK or NG
OK
©
GO TO 5.
NG
©
Replace engine coolant temperature sensor.
5
CHECK THERMOSTAT OPERATION
When the engine is cold [lower than 70°C (158°F)] condition, grasp lower radiator hose and confirm the engine coolant
does not flow.
OK or NG
OK
©
GO TO 6.
NG
©
Repair or replace thermostat. Refer to LC-15, “Thermostat”.
6
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-144.
©
INSPECTION END
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DTC P0125 ENGINE COOLANT TEMPERATURE SENSOR (ECTS)
Diagnostic Procedure (Cont’d)
EC-191
SEF463R
SEF288D
Component Description
NHEC0086
The heated oxygen sensor 1 (front) is placed into the front tube. It
detects the amount of oxygen in the exhaust gas compared to the
outside air. The heated oxygen sensor 1 (front) has a closed-end
tube made of ceramic zirconia. The zirconia generates voltage from
approximately 1V in richer conditions to 0V in leaner conditions.
The heated oxygen sensor 1 (front) signal is sent to the ECM. The
ECM adjusts the injection pulse duration to achieve the ideal air-
fuel ratio. The ideal air-fuel ratio occurs near the radical change
from 1V to 0V.
CONSULT-II Reference Value in Data Monitor
Mode
NHEC0087
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
HO2S1 (B1)
HO2S1 (B2)
I
Engine: After warming up
Maintaining engine speed at 2,000
rpm
0 - 0.3V
+,
Approx. 0.6 - 1.0V
MO2S1 MNTR
(B1)
MO2S1 MNTR
(B2)
LEAN
+,
RICH
Changes more than 5 times during
10 seconds.
SEF237U
On Board Diagnosis Logic
NHEC0089
Under the condition in which the heated oxygen sensor 1 (front)
signal is not input, the ECM circuits will read a continuous approxi-
mately 0.3V. Therefore, for this diagnosis, the time that output
voltage is within 200 to 400 mV range is monitored, and the diag-
nosis checks that this time is not inordinately long.
Malfunction is detected when the voltage from the sensor is con-
stantly approx. 0.3V.
DTC P0130 (BANK 1), P0150 (BANK 2) HO2S1 (FRONT) (CIRCUIT)
Component Description
EC-192
Possible Cause
NHEC0432
I
Harness or connectors
(The sensor circuit is open or shorted.)
I
Heated oxygen sensor 1 (front)
SEF643Y
SEF644Y
SEF645Y
DTC Confirmation Procedure
NHEC0090
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.
TESTING CONDITION:
Before performing the following procedure, confirm that bat-
tery voltage is more than 11V at idle.
WITH CONSULT-II
NHEC0090S01
1)
Start engine and warm it up to normal operating temperature.
2)
Select “HO2S1 (B1) P0130” or “HO2S1 (B2) P0150” of
“HO2S1” in “DTC WORK SUPPORT” mode with CONSULT-II.
3)
Touch “START”.
4)
Let it idle for at least 3 minutes.
NOTE:
Never raise engine speed above 3,600 rpm after this step. If
the engine speed limit is exceeded, return to step 4.
5)
When the following conditions are met, “TESTING” will be dis-
played on the CONSULT-II screen. Maintain the conditions
continuously until “TESTING” changes to “COMPLETED”. (It
will take approximately 10 to 60 seconds.)
ENG SPEED
1,400 - 2,400 rpm
Vehicle speed
70 - 120 km/h (43 - 75 MPH)
B/FUEL SCHDL
2.0 - 10 msec
Selector lever
Suitable position
If “TESTING” is not displayed after 5 minutes, retry from
step 2.
6)
Make sure that “OK” is displayed after touching “SELF-DIAG
RESULTS”.
If
“NG”
is
displayed,
refer
to
“Diagnostic
Procedure”, EC-197.
During this test, P1148 and P1168 may be stored in ECM.
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DTC P0130 (BANK 1), P0150 (BANK 2) HO2S1 (FRONT) (CIRCUIT)
Possible Cause
EC-193
SEF308XB
Overall Function Check
NHEC0091
Use this procedure to check the overall function of the heated oxy-
gen sensor 1 (front) circuit. During this check, a 1st trip DTC might
not be confirmed.
WITH GST
NHEC0091S01
1)
Start engine and warm it up to normal operating temperature.
2)
Set voltmeter probes between ECM terminal 63 [HO2S1 (B1)
signal] or 62 [HO2S1 (B2) signal] and engine ground.
3)
Check the following with engine speed held at 2,000 rpm con-
stant under no load.
I
The voltage does not remain in the range of 0.2 - 0.4V.
4)
If NG, go to “Diagnostic Procedure”, EC-197.
DTC P0130 (BANK 1), P0150 (BANK 2) HO2S1 (FRONT) (CIRCUIT)
Overall Function Check
EC-194
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