DTC P0135 HEATED OXYGEN SENSOR 1 HEATER (FRONT); Description; CONSULT-II Reference Value; ECM Terminals and Reference Value; On Board Diagnosis Logic; DTC Confirmation Procedure

EF & EC-7125spec table

P0135 heater circuit (terminal 37, wire W) — different from HO2S1 signal circuit (terminal 12, B/R) and ground-side ECT (terminal 11, L). DTC Confirmation Procedure body is truncated; continues on next page.

CG10, CGA3

Description

SYSTEM DESCRIPTION

System Description — Sensor / Signal / ECM Function / Actuator

Sensor	Input Signal to ECM	ECM function	Actuator
Crankshaft position sensor (POS)	Engine speed	Heated oxygen sensor 1 heater control	Heated oxygen sensor heater 1 (front)

Crankshaft position sensor (POS)

Input Signal to ECMEngine speed

ECM functionHeated oxygen sensor 1 heater control

ActuatorHeated oxygen sensor heater 1 (front)

The ECM performs ON/OFF control of the heated oxygen sensor 1 heater (front) corresponding to the engine operating condition.

OPERATION

Heater ON/OFF by Condition

CONDITION	Heated oxygen sensor 1 heater (front)
Ignition switch "ON"	OFF
At idle speed	ON

Ignition switch "ON"

Heated oxygen sensor 1 heater (front)OFF

At idle speed

Heated oxygen sensor 1 heater (front)ON

CONSULT-II Reference Value in Data Monitor Mode

Specification data are reference values.

CONSULT-II Data Monitor — HO2S1 MNTR

MONITOR ITEM	CONDITION	SPECIFICATION
HO2S1 MNTR	Engine speed: At idle	ON
HO2S1 MNTR	Ignition switch "ON" engine stopped	OFF

HO2S1 MNTR

CONDITIONEngine speed: At idle

SPECIFICATIONON

HO2S1 MNTR

CONDITIONIgnition switch "ON" engine stopped

SPECIFICATIONOFF

ECM Terminals and Reference Value

Specification data are reference values and are measured between each terminal and ground.

ECM Terminals — HO2S1 Heater (Front)

Terminal No.	Wire color	Item	Condition	Data (DC Voltage)
37	W	Heated oxygen sensor 1 heater (front)	[Engine is running] - At idle speed	Approximately 0V
37	W	Heated oxygen sensor 1 heater (front)	[Ignition switch "ON"] - Engine stopped	BATTERY VOLTAGE (11 - 14V)

Wire colorW

ItemHeated oxygen sensor 1 heater (front)

Condition[Engine is running] - At idle speed

Data (DC Voltage)Approximately 0V

Wire colorW

ItemHeated oxygen sensor 1 heater (front)

Condition[Ignition switch "ON"] - Engine stopped

Data (DC Voltage)BATTERY VOLTAGE (11 - 14V)

On Board Diagnosis Logic

Code P0135

Heated Oxygen Sensor 1 Heater (Front)

DTC Confirmation Procedure

NOTE

If "DTC Confirmation Procedure" has been previously conducted, always turn ignition switch "OFF" and wait at least 1 second before conducting the next test.

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