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Description
NGEC0644
SYSTEM DESCRIPTION
NGEC0644S01
Sensor Input Signal to ECM
ECM func-
tion
Actuator
Camshaft position sensor Engine speed
Heated
oxygen
sensor 1
heater
(front) con-
trol
Heated oxygen sensor 1 heat-
ers (front)
The ECM performs ON/OFF control of the heated oxygen sensor 1 heaters (front) corresponding to the engine
speed.
OPERATION
NGEC0644S02
Engine speed rpm Heated oxygen sensor 1 heaters (front)
Above 3,200 OFF
Below 3,200 ON
CONSULT-II Reference Value in Data Monitor
Mode
NGEC0645
Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
HO2S1 HTR (B1)
HO2S1 HTR (B2)
쐌 Engine speed: Below 3,200 rpm ON
쐌 Engine speed: Above 3,200 rpm OFF
ECM Terminals and Reference Value
NGEC0646
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM’s transistor. Use a ground other than the ECM terminals, such as the ground.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM CONDITION DATA (DC Voltage)
119 BR/Y
Heated oxygen sensor 1
heater (front) (bank 1)
[Engine is running]
쐌 Engine speed is above 3,200 rpm
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
쐌 Engine speed is below 3,200 rpm
Approximately 0.4V
121 BR
Heated oxygen sensor 1
heater (front) (bank 2)
[Engine is running]
쐌 Engine speed is above 3,200 rpm
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
쐌 Engine speed is below 3,200 rpm
Approximately 0.4V
DTC P0135, P0155 HEATED OXYGEN SENSOR 1 HEATER
(FRONT) (BANK 1)/(BANK 2)
VG33E
Description
EC-829
FE
CL
MT
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
GI
MA
EM
LC
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