Nissan Note [985/1872] Ec 985

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Nissan Note [985/1872] Description
DTC P0135 HO2S1 HEATER
EC-985
[HR (WITH EURO-OBD)]
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EC
DTC P0135 HO2S1 HEATER PFP:23710
Description
BBS004C7
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
BBS004C8
Specification data are reference values.
On Board Diagnosis Logic
BBS004C9
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 tempera-
ture
Engine speed Heated oxygen sensor 1 heater
Above 3,600 rpm OFF
Below 3,600 rpm after warming up 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
O2SEN HTR DTY
Engine coolant temperature when engine started: More than 80°C (176°F)
Engine speed: Below 3,600 rpm
Approx. 30%
DTC No.
Trouble diagnosis
name
DTC detecting condition Possible cause
P0135
0135
Heated oxygen
sensor 1 heater
control circuit
The current amperage in the heated oxygen sensor
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.)
Harness or connectors
(The heated oxygen sensor 1 heater circuit
is open or shorted.)
Heated oxygen sensor 1 heater

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