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Description
NHEC0162
SYSTEM DESCRIPTION
NHEC0162S01
Sensor Input Signal to ECM
ECM func-
tion
Actuator
Crankshaft position sensor (POS)
Engine speed
Heated oxy-
gen sensor 2
heater (rear)
control
Heated oxygen sensor 2 heaters
(rear)
Crankshaft position sensor (REF)
The ECM performs ON/OFF control of the heated oxygen sensor 2 heaters (rear) corresponding to the engine
speed.
OPERATION
NHEC0162S02
Engine speed rpm Heated oxygen sensor 2 heaters (rear)
Above 3,600 OFF
Below 3,600 ON
CONSULT-II Reference Value in Data Monitor
Mode
NHEC0163
Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
HO2S2 HTR (B1)
HO2S2 HTR (B2)
I Ignition switch: ON (Engine stopped)
I Engine is running above 3,600 rpm.
OFF
I Engine is running below 3,600 rpm after driving for 2 minutes at a
speed of 70 km/h (43 MPH) or more.
ON
On Board Diagnosis Logic
NHEC0165
Malfunction is detected when the current amperage in the heated
oxygen sensor 2 heater (rear) circuit is out of the normal range.
[An improper voltage drop signal is sent to ECM through the heated
oxygen sensor 2 heater (rear).]
Possible Cause
NHEC0442
I Harness or connectors
[The heated oxygen sensor 2 heater (rear) circuit is open or
shorted.]
I Heated oxygen sensor 2 heater (rear)
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0141 (BANK 1), P0161 (BANK 2) HO2S2 HEATER (REAR)
Description
EC-285
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