Infiniti G20 (P11). Manual — part 196
SEF152P
SEF012P
Component Inspection
NCEC0093
ENGINE COOLANT TEMPERATURE SENSOR
NCEC0093S01
Check resistance as shown in the figure.
<Reference data>
Temperature °C (°F)
Resistance k
Ω
20 (68)
2.1 - 2.9
50 (122)
0.68 - 1.0
90 (194)
0.236 - 0.260
If NG, replace engine coolant temperature sensor.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0125 ENGINE COOLANT TEMPERATURE (ECT) SENSOR
Component Inspection
EC-195
SEF463R
SEF288D
Component Description
NCEC0094
The heated oxygen sensor 1 (front) is placed into the exhaust
manifold. It detects the amount of oxygen in the exhaust gas com-
pared 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
NCEC0095
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
HO2S1 (B1)
I
Engine: After warming
up
Maintaining engine speed
at 2,000 rpm
0 - 0.3V
+,
Approx. 0.6 - 1.0V
HO2S1 MNTR (B1)
LEAN
+,
RICH
Changes more than 5 times during
10 seconds.
ECM Terminals and Reference Value
NCEC0096
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)
62
W
Heated oxygen sensor
1 (front)
[Engine is running]
I
After warming up to normal operating temperature
and engine speed is 2,000 rpm
0 - Approximately 1.0V
SEF059V
DTC P0130 HEATED OXYGEN SENSOR 1 (FRONT) (CIRCUIT)
Component Description
EC-196
SEF237U
On Board Diagnosis Logic
NCEC0097
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.
DTC No.
Malfunction is detected when ...
Check Items (Possible Cause)
P0130
I
The voltage from the sensor is constantly approx. 0.3V.
I
Harness or connectors
(The sensor circuit is open or shorted.)
I
Heated oxygen sensor 1 (front)
SEF643Y
SEF644Y
SEF645Y
DTC Confirmation Procedure
NCEC0098
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
1)
Start engine and warm it up to normal operating temperature.
2)
Select “HO2S1 (B1) P0130” of “HO2S1” in “DTC WORK SUP-
PORT” mode with CONSULT-II.
3)
Touch “START”.
4)
Let it idle for at least 3.5 minutes.
NOTE:
Never raise engine speed above 3,200 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
1,500 - 3,200 rpm
Vehicle speed
More than 65 km/h (40 MPH)
B/FUEL SCHDL
2.4 - 11.0 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
GI
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DTC P0130 HEATED OXYGEN SENSOR 1 (FRONT) (CIRCUIT)
On Board Diagnosis Logic
EC-197
RESULTS”.
If
“NG”
is
displayed,
refer
to
“Diagnostic
Procedure”, EC-200.
During this test, P1148 may be displayed on CONSULT-II
screen.
SEF011X
Overall Function Check
NCEC0099
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
1)
Start engine and warm it up to normal operating temperature.
2)
Set voltmeter probes between ECM terminal 62 [Heated oxy-
gen sensor 1 (front) 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-200.
DTC P0130 HEATED OXYGEN SENSOR 1 (FRONT) (CIRCUIT)
DTC Confirmation Procedure (Cont’d)
EC-198
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