Infiniti G20 (P11). Manual — part 205
SEF648Y
SEF011X
Without CONSULT-II
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 fluctuates between 0 to 0.3V and 0.6 to 1.0V more
than five times within 10 seconds.
1 time: 0 - 0.3V
→
0.6 - 1.0V
→
0 - 0.3V
2 times: 0 - 0.3V
→
0.6 - 1.0V
→
0 - 0.3V
→
0.6 - 1.0V
→
0
- 0.3V
I
The maximum voltage is over 0.6V at least one time.
I
The minimum voltage is below 0.3V at least one time.
I
The voltage never exceeds 1.0V.
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.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0134 HEATED OXYGEN SENSOR 1 (FRONT) (HIGH VOLTAGE)
Component Inspection (Cont’d)
EC-231
Description
NCEC0136
SYSTEM DESCRIPTION
NCEC0136S01
Sensor
Input Signal to ECM
ECM func-
tion
Actuator
Camshaft position sensor
Engine speed
Heated
oxygen
sensor 1
heater
(front) con-
trol
Heated oxygen sensor 1 heater
(front)
The ECM performs ON/OFF control of the heated oxygen sensor 1 heater (front) corresponding to the engine
operating condition.
OPERATION
NCEC0136S02
Engine speed
Front heated oxygen sensor heater
Above 3,200 rpm
OFF
Below 3,200 rpm
ON
CONSULT-II Reference Value in Data Monitor
Mode
NCEC0137
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
HO2S1 HTR (B1)
I
Engine speed: Below 3,200 rpm
ON
I
Engine speed: Above 3,200 rpm
OFF
ECM Terminals and Reference Value
NCEC0138
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.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
4
OR
Heated oxygen sensor 1
heater (front)
[Engine is running]
I
Engine speed is below 3,200 rpm.
Approximately 0V
[Engine is running]
I
Engine speed is above 3,200 rpm.
BATTERY VOLTAGE
(11 - 14V)
On Board Diagnosis Logic
NCEC0139
DTC No.
Malfunction is detected when ...
Check Items (Possible Cause)
P0135
I
The current amperage in the heated oxygen sensor 1
heater (front) circuit is out of the normal range.
[An improper voltage drop signal is sent to ECM through
the heated oxygen sensor 1 heater (front).]
I
Harness or connectors
[The heated oxygen sensor 1 heater (front) cir-
cuit is open or shorted.]
I
Heated oxygen sensor 1 heater (front)
DTC P0135 HEATED OXYGEN SENSOR 1 HEATER (FRONT)
Description
EC-232
DTC Confirmation Procedure
NCEC0140
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 between 10.5V and 16V at idle.
SEF058Y
With CONSULT-II
1)
Turn ignition switch “ON” and select “DATA MONITOR” mode
with CONSULT-II.
2)
Start engine and run it for at least 6 seconds at idle speed.
3)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-235.
With GST
1)
Start engine and run it for at least 6 seconds at idle speed.
2)
Turn ignition switch “OFF” and wait at least 10 seconds.
3)
Start engine and run it for at least 6 seconds at idle speed.
4)
Select “MODE 3” with GST.
5)
If DTC is detected, go to “Diagnostic Procedure”, EC-235.
I
When using GST, “DTC Confirmation Procedure” should
be performed twice as much as when using CONSULT-II
because GST cannot display MODE 7 (1st trip DTC) con-
cerning this diagnosis. Therefore, using CONSULT-II is
recommended.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0135 HEATED OXYGEN SENSOR 1 HEATER (FRONT)
DTC Confirmation Procedure
EC-233
Wiring Diagram
NCEC0141
TEC838
DTC P0135 HEATED OXYGEN SENSOR 1 HEATER (FRONT)
Wiring Diagram
EC-234
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