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Description
NFEC0826
SYSTEM DESCRIPTION
NFEC0826S01
Sensor Input Signal to ECM
ECM func-
tion
Actuator
Crankshaft position sensor (POS)
Engine speed
Heated
oxygen
sensor 1
heater con-
trol
Heated oxygen sensor 1 heat-
ers
Camshaft position sensor (PHASE)
The ECM performs ON/OFF control of the heated oxygen sensor 1 heaters corresponding to the engine speed.
OPERATION
NFEC0826S02
Engine speed rpm Heated oxygen sensor 1 heaters
Above 3,600 OFF
Below 3,600 ON
CONSULT-II Reference Value in Data Monitor
Mode
NFEC0827
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
NFEC0829
DTC No.
Trouble diagnosis
name
DTC Detecting Condition Possible Cause
P0031
0031
(Bank 1)
P0051
0051
(Bank 2)
Heated oxygen sen-
sor 1 heater control
circuit low
The current amperage in the heated oxygen sen-
sor 1 heater circuit is out of the normal range.
(An excessively low voltage signal is sent to ECM
through the heated oxygen sensor 1 heater.)
I Harness or connectors
(The heated oxygen sensor 1 heater
circuit is open or shorted.)
I Heated oxygen sensor 1 heater
P0032
0032
(Bank 1)
P0052
0052
(Bank 2)
Heated oxygen sen-
sor 1 heater control
circuit high
The current amperage in the heated oxygen sen-
sor 1 heater circuit is out of the normal range.
(An excessively high voltage signal is sent to ECM
through the heated oxygen sensor 1 heater.)
I Harness or connectors
(The heated oxygen sensor 1 heater
circuit is shorted.)
I Heated oxygen sensor 1 heater
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
Description
EC-175
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