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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
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