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HO2S1 HEATER
EC-771
[QR (WITHOUT EURO-OBD)]
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EC
HO2S1 HEATER PFP:22690
Description EBS01134
SYSTEM DESCRIPTION
The ECM performs ON/OFF duty control of the heated oxygen sensor 1 heater corresponding to the engine
speed and engine coolant temperature. The duty percent varies with engine coolant temperature when engine
is started.
OPERATION
CONSULT-II Reference Value in Data Monitor Mode EBS01135
Specification data are reference values.
Sensor Input Signal to ECM ECM function Actuator
Camshaft position sensor (PHASE)
Crankshaft position sensor (POS)
Engine speed
Heated oxygen sensor 1
heater control
Heated oxygen sensor 1
heater
Engine coolant temperature sensor Engine coolant temperature
Engine speed rpm Heated oxygen sensor 1 heater
Above 3,600 OFF
Below 3,600 ON
MONITOR ITEM CONDITION SPECIFICATION
HO2S1 HTR (B1)
● Engine: After warming up
● Engine speed: Below 3,600 rpm
ON
● Engine speed: Above 3,600 rpm OFF
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