Infiniti I30 (A33). Manual — part 231
Description
NHEC0123
SYSTEM DESCRIPTION
NHEC0123S01
Sensor
Input Signal to ECM
ECM func-
tion
Actuator
Crankshaft position sensor (POS)
Engine speed
Heated oxy-
gen sensor 1
heater (front)
control
Heated oxygen sensor 1 heaters
(front)
Crankshaft position sensor (REF)
The ECM performs ON/OFF control of the heated oxygen sensor 1 heaters (front) corresponding to the engine
speed.
OPERATION
NHEC0123S02
Engine speed
rpm
Heated oxygen sensor 1 heaters (front)
Above 3,600
OFF
Below 3,600
ON
CONSULT-II Reference Value in Data Monitor
Mode
NHEC0124
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
HO2S1 HTR (B1)
HO2S1 HTR (B2)
I
Engine speed: Below 3,600 rpm
ON
I
Engine speed: Above 3,600 rpm
OFF
On Board Diagnosis Logic
NHEC0126
Malfunction is detected when 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 front
heated oxygen sensor heater.)
Possible Cause
NHEC0437
I
Harness or connectors
[The heated oxygen sensor 1 heater (front) circuit is open or
shorted.]
I
Heated oxygen sensor 1 heater (front)
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0135 (BANK 1), P0155 (BANK 2) HO2S1 HEATER (FRONT)
Description
EC-239
SEF058Y
DTC Confirmation Procedure
NHEC0127
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.
WITH CONSULT-II
NHEC0127S01
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-243.
WITH GST
NHEC0127S02
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-243.
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.
DTC P0135 (BANK 1), P0155 (BANK 2) HO2S1 HEATER (FRONT)
DTC Confirmation Procedure
EC-240
Wiring Diagram
NHEC0128
BANK 1
NHEC0128S01
MEC410D
SEF655XD
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0135 (BANK 1), P0155 (BANK 2) HO2S1 HEATER (FRONT)
Wiring Diagram
EC-241
BANK 2
NHEC0128S02
MEC411D
SEF656XD
DTC P0135 (BANK 1), P0155 (BANK 2) HO2S1 HEATER (FRONT)
Wiring Diagram (Cont’d)
EC-242
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