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Description
NFEC0833
SYSTEM DESCRIPTION
NFEC0833S01
Sensor Input Signal to ECM
ECM func-
tion
Actuator
Crankshaft position sensor (POS)
Engine speed
Heated
oxygen
sensor
heater 2
control
Heated oxygen sensor 2 heat-
ers
Camshaft position sensor (PHASE)
The ECM performs ON/OFF control of the heated oxygen sensor 2 heaters corresponding to the engine speed.
OPERATION
NFEC0833S02
Engine speed rpm Heated oxygen sensor 2 heaters
Above 3,600 OFF
Below 3,600 ON
CONSULT-II Reference Value in Data Monitor
Mode
NFEC0834
Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
HO2S2 HTR (B1)
HO2S2 HTR (B2)
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
NFEC0836
DTC No.
Trouble diagnosis
name
DTC Detecting Condition Possible Cause
P0037
0037
(Bank 1)
P0057
0057
(Bank 2)
Heated oxygen sen-
sor 2 heater control
circuit low
The current amperage in the heated oxygen sen-
sor 2 heater circuit is out of the normal range.
(An excessively low voltage signal is sent to ECM
through the heated oxygen sensor 2 heater.)
I Harness or connectors
(The heated oxygen sensor 2 heater
circuit is open or shorted.)
I Heated oxygen sensor 2 heater
P0038
0038
(Bank 1)
P0058
0058
(Bank 2)
Heated oxygen sen-
sor 2 heater control
circuit high
The current amperage in the heated oxygen sen-
sor 2 heater circuit is out of the normal range.
(An excessively high voltage signal is sent to ECM
through the heated oxygen sensor 2 heater.)
I Harness or connectors
(The heated oxygen sensor 2 heater
circuit is shorted.)
I Heated oxygen sensor 2 heater
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
Description
EC-181
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