heater TOYOTA AVENSIS 2005 Service Owner's Manual

P18349
±
DIAGNOSTICS SFI SYSTEM(1ZZ±FE/3ZZ±FE)
05±57
AVENSIS REPAIR MANUAL (RM1018E)
1CHECK OTHER DTC OUTPUT(BESIDES HEATED OXYGEN SENSOR DTCS)
(a)Read the DTC using the hand±held tester.
Result:
Display (DTC output)Proceed to
Only ºP0130 and/or P0136º are outputA
ºP0130 and/or P0136º and other DTCs are outputB
HINT:
If any other codes besides ºP0130 and/or P0136º are output, perform \
the troubleshooting for those DTCs
first.
BGO TO RELEVANT DTC CHART (See page 05±16)
A
2READ VALUE OF HAND±HELD TESTER(OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR)
(a)Warm up the heated oxygen sensor with the engine speed at 2,500 rpm for a\
pproximately 90 seconds.
(b)Read the output voltage of the heated oxygen sensor during idling.
Heated oxygen sensor output voltage:
Alternates less than 0.4 V and more than 0.55 V (See the following tabl\
e).
OKGo to step 11
NG
3INSPECT HEATED OXYGEN SENSOR(HEATER RESISTANCE) (See page 05±45)
NGREPLACE HEATED OXYGEN SENSOR
OK
4INSPECT EFI RELAY (See page 10±3)
NG REPLACE EFI RELAY
OK

A66651A±A SectionAir Solid Electrolyte
(Zirconia Element)
Platinum ElectrodeHeater
Exhaust Gas
CoverIdeal Air±Fuel Mixture
Output Voltage
Richer ± Air Fuel Ratio ± Leaner Element
AA
± DIAGNOSTICSSFI SYSTEM (1ZZ±FE/3ZZ±FE)
05±45
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0125 INSUFFICIENT COOLANT TEMP. FOR
CLOSED LOOP FUEL CONTROL
CIRCUIT DESCRIPTION
The heated oxygen sensor is the planar type. Compared to the conventional type, the sensor element and
the heater portions have a narrower overall. The heater can directly conduct its heat to the zirconia element
via the alumina, it helps to accerate the sensor activation.
To obtain a high purification rate for the CO, HC and NOx components of the exhaust gas, a three ± way
catalytic converter is used. For the most efficient use of the three ± way catalytic converter, the air ± fuel ratio
must be precisely controlled so that it is always close to the stoichiometric air ± fuel ratio.
The heated oxygen sensor has the characteristic whereby its output voltage changes suddenly in the vicinity
of the stoichiometric air±fuel ratio. This is used to detect the oxygen concentration in the exhaust gas and
provide the ECM with feedback control the air±fuel ratio.
When the air±fuel ratio becomes LEAN, the oxygen concentration in the exhaust gas increases. And the
heated oxygen sensor informs the ECM of the LEAN condition (low voltage, i. e. less than 0.45 V ).
When the air±fuel ratio is RICHER than the stoichiometric air±fuel ratio, the oxygen concentration in the ex-
haust gas is reduced. And the heated oxygen sensor informs the ECM of the RICH condition (high voltage,
i. e. more than 0.45V). The ECM judges by the voltage output from the heated oxygen sensor whether the
air±fuel ratio is RICH or LEAN and controls the injection time accordingly. If the malfunction of the heated
oxygen sensor causes an output of abnomal voltage, the ECM becomes unable to perform accurate air±fuel
ratio control.
The heated oxygen sensors include a heater which heats the zirconia element. The heater is controlled by
the ECM. When the intake air volume is low (the temperature of the exhaust gas is low), current flows to the
heater in order to heat the sensor for the accurate oxygen concentration detection.
DTC NoDTC Detecting ConditionTrouble Area
P0125
After engine is warmed up, heated oxygen sensor output* does
not change when conditions (a), (b), (c) and (d) continue for at
least 1.5 min:
*: Output value changes at inside of the ECM only
(a) Engine speed: 1,400 rpm or more
(b) Vehicle speed: 40 to 100 km/h (25 to 62 mph)
(c) Throttle valve is not fully closed
(d) 180 sec. or more after starting engine
Open or short in heated oxygen sensor circuit

Heated oxygen sensor

Air induction system

Fuel pressure

Injector

Gas leakage in exhaust system

ECM
05C69±01

+25 %
±12.5 %
More than 0.55 V
Less than 0.4V
Case 1
Case 2
Case 3
Case 4
Output voltage of heated oxygen
sensor (sensor 1: front sensor)
Injection volume
Output voltage
Output voltage of heated oxygen
sensor (sensor 2: rear sensor)Mainly suspect
trouble area
OK
+25 %
±12.5 %
More than 0.55 V
Less than 0.4V
Injection volume
Output voltage
+25 %
±12.5 %
More than 0.55 V
Less than 0.4V
Injection volume
Output voltage
Sensor 1: front sensor
(sensor 1, heater, sensor 1
circuit)
+25 %
±12.5 %
More than 0.55 V
Less than 0.4V
Injection volume
Output voltage
+25 %
±12.5 %
Injection volume
Output voltage
NG
+25 %
±12.5 %
Injection volume
Output voltage
NG
+25 %
±12.5 %
Injection volume
Output voltage
NG
+25 %
±12.5 %
Injection volume
Output voltage
NGExtremely rich or lean of the
actual air±fuel ratio
(Injector, fuel pressure, gas
leakage in exhaust system,
etc.) OK
OK
OK
No reaction
No reaction
No reaction No reaction

Sensor 2: rear sensor
(sensor 2, heater, sensor 2
circuit)
± DIAGNOSTICSSFI SYSTEM (1ZZ±FE/3ZZ±FE)
05±47
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
HINT:
Hand±held tester only:
Narrowing down the trouble area is possible by performing ACTIVE TEST of the following ºA/F CONTROLº
(heated oxygen sensor or other trouble areas can be distinguished).
(a) Perform ACTIVE TEST by the hand±held tester (A/F CONTROL).
HINT:
ºA/F CONTROLº is an ACTIVE TEST which changes the injection volume ±12.5 % or +25 %.
(1) Connect the hand±held tester to the DLC3 on the vehicle.
(2) Turn the ignition switch ON.
(3) Warm up the engine with the engine speed at 2,500 rpm for approximately 90 sec.
(4) Select the item ºDIAGNOSIS / OBD/MOBD / ACTIVE TEST / A/F CONTROLº.
(5) Perform ºA/F CONTROLº with the engine in an idle condition (press the right or left button).
Result:
Heated oxygen sensor reacts in accordance with increase and decrease of injection volume:
+25 %
rich output: More than 0.55 V
±12.5 %
lean output: Less than 0.4 V
NOTICE:
There is a few second delay in the sensor 1 (front sensor) output, and there is about 20 seconds delay
in the sensor 2 (rear sensor)output.

A79112
+BE2
Heated Oxygen Sensor
H7 HT
OX
A73938
+B
E2
Heated Oxygen Sensor
H17 HT
OX


 
A79069
Engine Room R/B No.4 EFI No.2 Fuse
±
DIAGNOSTICS SFI SYSTEM(1ZZ±FE/3ZZ±FE)
05±49
AVENSIS REPAIR MANUAL (RM1018E)
3INSPECT HEATED OXYGEN SENSOR(HEATER RESISTANCE)
(a)Disconnect the heated oxygen sensor connector.
(b)Inspect the heated oxygen sensor.
Standard: (Bank1 Sensor1)
Symbols (Terminal No.)ConditionSpecified condition
HT (H7±1) ± +B (H7±2)20
C (68
F)6 to 9

HT (H7±1) ± E2 (H7±4)
No Continuity
Standard: (Bank1 Sensor2)
Symbols (Terminal No.)ConditionSpecified condition
HT (H17±1) ± +B (H17±2)20
C (68
F)11 to 16

HT (H17±1) ± E2 (H17±4)
No Continuity
NGREPLACE HEATED OXYGEN SENSOR
OK
4INSPECT EFI RELAY (See page 10±3)
NG REPLACE EFI RELAY
OK
5 CHECK FUSE(EFI No.2)
(a) Remove the EFI No.2 fuse from the engine room R/B No.4.
(b) Check for continuity in the EFI fuse. Standard: Continuity
NG CHECK FOR SHORT IN ALL HARNESS AND COMPONENTS CONNECTED FUSE
OK

05C6N±01
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
05±161
AVENSIS REPAIR MANUAL (RM1018E)
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Parameters listed in the chart may not be exactly the same as your readings due to\
the type of instrument
or other factors.

If a malfunction code is displayed during the DTC check in the check mode, check the circuit f\
or the codes
listed in the table below. For details of each code, refer to the ''See page '' under the respective ''DTC No.''
in the DTC chart.



\f \b
 *1
CHK ENG 
P0010/39 *4 (05±169)Camshaft Position ºAº Actuator
Circuit (Bank 1)
Open or short in oil control valve (OCV) circuit

Oil control valve

ECM

P0011/59 *4
(05±174)Camshaft Position ºAº ±Timing
Over±Advanced or System Per-
formance (Bank 1)
Valve timing

Oil control valve (OCV)

Camshaft timing gear assy


P0012/59 *4
(05±174)Camshaft Position ºAº ±Timing
Over± Retarded (Bank 1)
Camshaft timing gear assy

ECM


P0016/18 *4
(05±181)Crankshaft Position ± Camshaft
Position Correlation (Bank 1
Sensor A)
Mechanical system (Timing chain has jumped a tooth, chain
stretched)

ECM


P0031/21
*2, *4
(05±182)Oxygen (A/F) Sensor Heater
Control Circuit Low (Bank 1 Sen-
sor 1)


P0032/21
*2, *4
(05±182)Oxygen (A/F) Sensor Heater
Control Circuit High (Bank 1
Sensor 1)

Open or short in heater circuit of A/F sensor

A/F sensor heater

P0051/28
*2, *4
(05±182)Oxygen (A/F) Sensor Heater
Control Circuit Low (Bank 2 Sen-
sor 1)
A/F sensor heater

A/F relay

ECM


P0052/28
*2, *4
(05±182)Oxygen (A/F) Sensor Heater
Control Circuit High (Bank 2
Sensor 1)


P0100/31
(05±186)Mass Air Flow Circuit
Ohti ifltiit

P0102/31(05±186)Mass or volume Air Flow Circuit
Low Input
Open or short in mass air flow meter circuit

Mass air flow meter

ECM

P0103/31
(05±186)Mass or volume Air Flow Circuit
High Input
ECM

P0110/24(05±194)Intake Air Temperature Circuit
O h ti itk it i it


P0112/24(05±194)Intake Air Temperature Circuit
Low Input
Open or short in intake air temp. sensor circuit

Intake air temp. sensor (built in mass air flow meter)

ECM


P0113/24
(05±194)Intake Air Temperature Circuit
High Input
ECM


P0115/22(05±199)Engine Coolant Temperature Cir-
cuit
Open or short in engine coolant temperature sensor circuit

P0117/22(05±199)Engine Coolant Temperature Cir-
cuit Low Input
Open or short in engine coolant temperature sensor circuit

Engine coolant temperature sensor

ECM

P0118/22
(05±199)Engine Coolant Temperature Cir-
cuit High Input
ECM

P0120/41 (05±204)Throttle/Pedal Position Sensor/
Switch ºAº Circuit
Throttle position sensor (built in throttle body)

ECM

P0122/41
(05±204)Throttle/Pedal Position Sensor/
Switch ºAº Circuit Low Input

Throttle position sensor (built in throttle body)

Short in VTA1 circuit

Open in VC circuit

ECM



05±162
±
DIAGNOSTICS SFI SYSTEM (1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E) P0123/41
(05±204)
Throttle/Pedal Position Sensor/
Switch ºAº Circuit High Input

Throttle position sensor (built in throttle body)

Open in VTA1 circuit

open in E2 circuit

VC and VTA1 circuit are short±circuited

ECM


P0136/27 *4
(05±211)Oxygen Sensor Circuit Malfunc-
tion (Bank 1 Sensor 2)

Open or short in heated oxygen sensor circuit

Heated oxygen sensor

Heated oxygen sensor heater

EFI relay


P0141/27 *4
(05±218)Oxygen Sensor Heater Circuit
malfunction (Bank 1 Sensor 2)

Open or short in heater circuit of heated oxygen sensor

Heated oxygen sensor heater

EFI relay

ECM


P0156/29 *4
(05±211)Oxygen Sensor Circuit Malfunc-
tion (Bank 2 Sensor 2)

Open or short in heated oxygen sensor circuit

Heated oxygen sensor

Heated oxygen sensor heater

EFI relay


P0161/29 *4
(05±218)Oxygen Sensor Heater Circuit
(Bank 2 Sensor 2)

Open or short in heater circuit of heated oxygen sensor

Heated oxygen sensor heater

EFI relay

ECM


P0325/52
(05±222)Knock Sensor 1 Circuit (Bank 1
or Single Sensor)
Knock sensor 1

Knock sensor 1 (under±torqued or loose)

ECM

P0327/52
(05±222)Knock Sensor 1 Circuit Low
Input (Bank 1 or Single Sensor)
Short in knock sensor 1 circuit

Knock sensor 1

ECM

P0328/52
(05±222)Knock Sensor 1 Circuit High
Input (Bank 1 or Single Sensor)
Open in knock sensor 1 circuit

Knock sensor 1

ECM

P0335/12, 13
(05±226)Crankshaft Position Sensor ºAº
Circuit
Open or short in crankshaft position sensor circuit

Crankshaft position sensor
P0339/13
(05±226)Crankshaft Position Sensor ºAº
Circuit Intermittent
Crankshaft osition sensor

Signal plate (crankshaft)

ECM

P0340/12
(05±229)Camshaft Position Sensor ºAº
Circuit (Bank 1 or Single Sensor)
Open or short in camshaft position sensor circuit

Camshaft position sensor
P0341/12
(05±229)Camshaft Position Sensor ºAº
Circuit Range/Performance
(Bank 1 or Single Sensor)
Camshaft osition sensor

Camshaft timing pulley

Timing chain has jumped a tooth

ECM

P0351/14 *3
(05±232)Ignition Coil ºAº Primary/Sec-
ondary Circuit

Ignition system

P0352/15 *3(05±232)Ignition Coil ºBº Primary/Sec-
ondary Circuit
Ignition system

Open or short in IGF or IGT1 to 4 circuit from ignition coil with
igniter to ECM
P0353/14 *3
(05±232)Ignition Coil ºCº Primary/Sec-
ondary Circuit
igniter to ECM

No. 1 to No. 4 ignition coil with igniter

IG2 relay
P0354/15 *3
(05±232)Ignition Coil ºDº Primary/Sec-
ondary Circuit
ECM
P0500/42
(05±240)Vehicle Speed Sensor ºAº

Open or short in speed sensor circuit

Speed sensor

Combination meter

ECM

Skid control ECU

P0511/33
(05±243)Idle Air Control Circuit

Open or short in idle speed control (ISC) valve circuit

Idle speed control (ISC) valve is stuck or closed

A/C switch circuit

Air induction system

ECM

P0606/89
(05±247)ECM/PCM Processor
ECM

±
DIAGNOSTICS SFI SYSTEM (1AZ±FE)
05±163
AVENSIS REPAIR MANUAL (RM1018E)P0710/38
(05±882)
Transmission Fluid Temperature
Sensor ºAº Circuit
P0712/38(05±882)Transmission Fluid Temperature
Sensor ºAº Circuit Low Input
P0713/38(05±882)Transmission Fluid Temperature
Sensor ºAº Circuit High Input
P0717/37(05±884)Input/Turbine Speed Sensor ºAº
Circuit No Signal
P0748/62(05±886)Pressure Control Solenoid ºAº
Electrocal (Shift Solenoid Valve
SL1)

Electronic controlled automatic transmission (ECT)
P0778/63
(05±886)Pressure Control Solenoid ºBº
Electrocal (Shift Solenoid Valve
SL2)

P0793/67(05±892)Intermediate Shaft Speed Sen-
sor ºAº
P0982/65(05±886)Shift Solenoid ºDº Control Circuit
Low (Shift Solenoid Valve S4)
P0983/65(05±886)Shift Solenoid ºDº Control Circuit
High (Shift Solenoid Valve S4)
P2237/21 *2, *4
(05±248)Oxygen Sensor Pumping Cur-
rent Circuit/ Open (for A/F sen-
sor) (Bank 1 Sensor 1)


P2238/21
*2, *4
(05±248)Oxygen Sensor Pumping Cur-
rent Circuit Low (for A/F sensor)
(Bank 1 Sensor 1)


P2239/21
*2, *4
(05±248)Oxygen Sensor Pumping Cur-
rent Circuit High (for A/F sensor)
(Bank 1 Sensor 1)


P2240/28
*2, *4
(05±248)Oxygen Sensor Pumping Cur-
rent Circuit/ Open (for A/F sen-
sor) (Bank 2 Sensor 1)


P2241/28
*2, *4
(05±248)Oxygen Sensor Pumping Cur-
rent Circuit Low (for A/F sensor)
(Bank 2 Sensor 1)


P2242/28
*2, *4
(05±248)Oxygen Sensor Pumping Cur-
rent Circuit High (for A/F sensor)
(Bank 2 Sensor 1)
Open or short in A/F sensor circuit

A/F sensor

A/F sensor heater

P2251/21
*2, *4
(05±248)Oxygen Sensor Reference
Ground Circuit/ Open (for A/F
senor) (Bank 1 Sensor 1)
A/F sensor heater

A/F sensor heater relay

A/F sensor heater and relay circuit

ECM


P2252/21
*2, *4
(05±248)Oxygen Sensor Reference
Ground Circuit Low (for A/F se-
nor) (Bank 1 Sensor 1)


P2253/21
*2, *4
(05±248)Oxygen Sensor Reference
Ground Circuit High (for A/F se-
nor) (Bank 1 Sensor 1)


P2254/28
*2, *4
(05±248)Oxygen Sensor Reference
Ground Circuit/ Open (for A/F
senor) (Bank 2 Sensor 1)


P2255/28
*2, *4
(05±248)Oxygen Sensor Reference
Ground Circuit Low (for A/F se-
nor) (Bank 2 Sensor 1)


P2256/28
*2, *4
(05±248)Oxygen Sensor Reference
Ground Circuit High (for A/F se-
nor) (Bank 2 Sensor 1)



\bA79115
Reference (Bank 1 Sensor 2 System Drawing)Heated Oxygen Sensor
EFI Relay
Heater
SensorOX1B HT1BECM
From
Battery EFI Fuse
O1B±
MREL
EFI No.2 Fuse
05±218
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
DTCP0141/27OXYGEN SENSOR HEATER CIRCUIT MALFUNCTION (BANK 1 SENSOR 2)
DTCP0161/29OXYGEN SENSOR HEATER CIRCUIT (BANK 2 SENSOR 2)
CIRCUIT DESCRIPTION
Refer to DTC P0136/27 on page 05±211.
HINT:
The ECM provides a pulse width modulated control circuit to adjust current \
through the heater. The heated
oxygen sensor heater circuit uses a relay on the B+ side of the circuit.
DTC No.DTC Detection ConditionTrouble Area
P0141/27
Heated current is 0.2 A or less when heater operates
(1 trip detection logic)
Open or short in heater circuit of heated oxygen sensor

Heated oxygen sensor heater
P0141/27
P0161/29When heater operates, heated current exceeds 2 A
(1 trip detection logic)
yg

EFI relay

ECM
HINT:

Bank 1 refers to the bank that includes cylinder No.1.

Bank 2 refers to the bank that does not include cylinder No.1.

Sensor 1 refers to the sensor closest to the engine assembly.

Sensor 2 refers to the sensor farthest away from the engine assembly.
WIRING DIAGRAM
Refer to DTC P0136/27 on page 05±211.
INSPECTION PROCEDURE
HINT:

If different DTCs that are related to a different system are output simultaneously while terminal E2 is
used as a ground terminal, terminal E2 may be open.

Read freeze frame data using 
\f

\f \f\f Freeze frame data records the engine conditions
when a malfunction is detected. When troubleshooting, it is useful for d\
etermining whether the vehicle
was running or stopped, the engine was warmed up or not, the air±fuel ra\
tio was lean or rich, etc. at
the time of the malfunction.
05C6Y±01

23
4 1
A79117
+B
HT
Bank 1
Sensor 2
Bank 2
Sensor 2 H8
H10
Heated Oxygen Sensor Connector
E1
OX
B16200
A18294
HT1B (+)HT2B (+)E01 (±)E13
E10
ECM Connector
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
05±219
AVENSIS REPAIR MANUAL (RM1018E)
1INSPECT HEATED OXYGEN SENSOR(HEATER RESISTANCE)
(a)Disconnect the heated oxygen sensor connector.
(b)Inspect the heated oxygen sensor.
Standard:
Symbols (Terminal No.)ConditionSpecified condition
HT (H8±1) ± +B (H8±2)20C (68 F)11 to 16

HT (H8±1) ± E1 (H8±4)
No Continuity
HT (H10±1) ± +B (H10±2)20C (68 F)11 to 16

HT (H10±1) ± E1 (H10±4)
No Continuity
NGREPLACE HEATED OXYGEN SENSOR
OK
2INSPECT EFI RELAY
(a)Remove the EFI relay from the engine room R/B.
(b)Inspect the EFI relay. Standard:
Terminal No.Specified condition
1 ± 2Continuity
No Continuity
3 ± 5Continuity
(Apply battery voltage terminals 1 and 2)
NGREPLACE EFI RELAY
OK
3INSPECT ECM(HT1B OR HT2B VOLTAGE)
(a)Turn the ignition switch ON.
(b)Measure the voltage between the applicable terminals of the E10 and E13 ECM connector.
Standard:
Symbols (Terminal No.)Specified condition
HT1B (E10±4) ± E01 (E13±7)9to14VHT2B (E10±3) ± E01 (E13±7)9 to 14 V
HINT:

The HT1B means the heated oxygen sensor bank 1 sen-
sor 2.

The HT2B means the heated oxygen sensor bank 2 sen-
sor 2.
OKCHECK AND REPLACE ECM (See page 01±32)
NG

A66651A±A SectionAir Solid Electrolyte
(Zirconia Element)
Platinum ElectrodeHeater
Exhaust Gas
CoverIdeal Air±Fuel Mixture
Output Voltage
Richer ± Air Fuel Ratio ± Leaner Element
AA
± DIAGNOSTICSSFI SYSTEM (1AZ±FE)
05±211
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0136/27 OXYGEN SENSOR CIRCUIT MALFUNCTION
(BANK 1 SENSOR 2)
DTC P0156/29 OXYGEN SENSOR CIRCUIT MALFUNCTION
(BANK 2 SENSOR 2)
CIRCUIT DESCRIPTION
The heated oxygen sensor is the lamination type. Compared to the conventional type, the sensor and heater
portions of the lamination type are narrower overall. Because the heat of the heater acts directly on the alumi-
na and zirconia (of the sensor portion) it accelerates the activation of the sensor.
To obtain a high purification rate for the CO, HC and NOx components of the exhaust gas, a three±way cata-
lytic converter is used. But for the most efficient use of the three±way catalytic converter, the air±fuel ratio
must be precisely controlled so that it is always close to the stoichiometric air±fuel ratio.
The heated oxygen sensor has the characteristic whereby its output voltage changes suddenly in the vicinity
of the stoichiometric air±fuel ratio. This is used to detect the oxygen concentration in the exhaust gas and
provide the ECM with feedback control the air±fuel ratio.
When the air±fuel ratio becomes LEAN, the oxygen concentration in the exhaust gas increases. And the
heated oxygen sensor informs the ECM of the LEAN condition (low voltage, i.e. less than 0.45 V).
When the air±fuel ratio is RICHER than the stoichiometric air±fuel ratio, the oxygen concentration in the ex-
haust gas is reduced. And the heated oxygen sensor informs the ECM of the RICH condition (high voltage,
i.e. more than 0.45 V). The ECM judges by the voltage output from the heated oxygen sensor whether the
air±fuel ratio is RICH or LEAN and controls the injection time accordingly. However, if the malfunction of the
heated oxygen sensor causes an output of abnormal voltage, the ECM becomes unable to perform accurate
air±fuel ratio control.
The heated oxygen sensors include a heater which heats the zirconia element. The heater is controlled by
the ECM. When the intake air volume is low (the temperature of the exhaust gas is low), current flows to the
heater in order to heat the sensor for the accurate oxygen concentration detection.
DTC NoDTC Detection ConditionTrouble Area
The following condition continues for 480 sec. or more:
Open or short in heated oxygen sensor (bank 1, 2 sensor 2)
circuitP0136/27
P0156/29
g

During driving with the engine warmed up, voltage output of
the heated oxygen sensor remains at 0.45 V or more, or 0.60circuit

Heated oxygen sensor (bank 1, 2 sensor 2)
Heated o gen sensor heater (bank 1 2 sensor 2)P0156/29the heated oxygen sensor remains at 0.45 V or more, or 0.60
V or less.
Heated oxygen sensor heater (bank 1, 2 sensor 2)

EFI relay
05C6X±01