TOYOTA AVENSIS 2005 Service Repair Manual

A91218
ECM Monitor ed
A/F Sens or Voltage
Air−Fuel Ratio
Solid Electrolyte
(Zirconia Element)
Cover Atmosphere
Exhaust Gas Flange
Platinum Electrode
Coating (Ceramic)
Heater
−
DIAGNOSTICS ECD SYSTEM (1CD−FTV)(From September, 2003)
05 −305
AVENSIS Supplement (RM1045E)
DTC P003 1 OXYGEN (A/F) SENSOR HEATER CONTROL
CIRCUIT LOW (BANK 1 SENSOR 1)
HINT:
S For more information on the A/F sensor and TOYOTA D −CAT (*1), see page 05 −255.
S If P0031 is present, refer to the diagnostic trouble codes (DTCs) table for the TOYOTA D −CAT on page
05 −255.
SThis DTC is related to the A/F sensor, although the caption is the oxygen sensor.
*1: Diesel Clean Advanced Technology.
CIRCUIT DESCRIPTION
The A/F sensor has the characteristic that it provides output voltage which is proportional to the existing air −
fuel ratio. The A/F sensor output voltage (*2) is used to provide the ECM with feedback to control the air −fuel
ratio.
The A/F sensor is located after the DPNR (*3) catalytic converter. This sensor has been developed based
on structure and technology of a sensor that is being used for gasoline engines. Its cover portion of the sen-
sor has been changed for application of use to the diesel engine with TOYOTA D −CAT in order to eliminate
influence of the sensor temperature and particulate matter (PM).
In order to reduce both PM and nitrogen oxides (NOx), the ECM adjusts the air −fuel ratio to slightly RICH
(but it is LEAN compared with a stoichiometric air −fuel ratio) with signals from the A/F sensor, if needed.
When the ECM exercises DPNR catalyst regeneration by adding fuel using the exhaust fuel addition injector,
the air −fuel ratio is also properly adjusted through the sensor.
*2: The voltage value changes inside the ECM only.
*3: Diesel Particulate −NOx Reduction system.
05I7J −01

B62793
Reference:
A/F Sensor A/F Sensor
Heater Relay
Heater
Sensor
AF2+ HAF2
Duty
Control ECM
From
Battery
A/F Fuse
AF2−
MREL 05−306
− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
AVENSIS Supplement (RM1045E)
HINT:
The ECM provides a pulse width modulated control circuit to adjust current through the heater. The A/F sen-
sor heater circuit uses a relay on the B+ side of the circuit.
DTC No.DTC Detection ConditionTrouble Area
P0031Heated current is 1.5 A or less when the heater operates
(1 trip detection logic)
SOpen in A/F sensor heater circuit
SA/F sensor heater
SA/F sensor heater relay
SECM
MONITOR DESCRIPTION
The inner surface of the A/F sensor element is exposed to outside air. The outer surface of the sensor ele-
ment is exposed to exhaust gases. The sensor element is made of platinum coated zirconia and includes
an integrated heating element. The zirconia element generates small voltage when there is a large differ-
ence in the oxygen concentrations of the exhaust and the outside air. The platinum coating amplifies the
voltage generation. When heated, the sensor becomes very efficient. If the temperature of the exhaust is
low, the sensor will not generate useful voltage signals without supplemental heating. The ECM regulates
the supplemental heating using a duty−cycle approach to regulate the average current in the heater ele-
ment. If the heater current is out of the normal range, the sensor’s output signals will be inaccurate and the
ECM can not regulate the air−fuel ratio properly. When the heater current is out of the normal operating
range, the ECM interprets this as a malfunction and sets a DTC.

A91217
MREL
W
GRE9
IE5
B
Battery FL MAINAF2+ 8
1 126
Engine Room
R/B No. 1ECM
6AGR
3AF2−
HAF2
E1 E1035
E1034 1
IP1 (RHD)(LHD) 1
2
W
1
2
1
11B
W
2
1
325
3
W−B
A
A
A
W−B(RHD)
(LHD)W−B
A
IP IKEI J17
J/C
J15
J/C B−R
Fuse Block
A/F AM1 No. 1 140A ALT
A35
A/F Sensor
Relay B−R
W
(*1)W
(*2)
IH2 1
B−W
(*1)A34A34 A34 A34A34
A34
A34
A34 2
2 11 3
44
3
+B AF+
AF−
HT B
(*1)
(*2)
(*1)
(*2) (*2)
B(*1)
(*3)W(*1)
W
(*2) IH2 3
IH2 4
B
(*1)BR
(*1)
A34
A/F sensor BR
E12
E127 5
IK1 3
L−RL−R
(*2)
L−R
(*1) IH2
2R
(*1)
BR J/C J13
J12 D
E
BR
*1: w/ Headlight Beam Level Control
*2: w/o Headlight Beam Level Control
*3: Shielded
− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
05−307
AVENSIS Supplement (RM1045E)
WIRING DIAGRAM

A87894
AF−AF+
A34
Front View Component Side
(w/ Headlight Beam Level Control):
1 2
3 4
HT
+B
A/F Sensor
Connector
A87894
AF− AF+
A34
Front View
HT +B
1 2
3 4 Component Side
(w/o Headlight Beam Level Control):
A/F Sensor
Connector
B16200
05−308
− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
AVENSIS Supplement (RM1045E)
INSPECTION PROCEDURE
1INSPECT AIR FUEL RATIO SENSOR(RESISTANCE)
(a) Disconnect the A34 A/F sensor connector.
(b) Measure the resistance between the terminals of the A/F
sensor.
Resistance (w/ Headlight beam level control):
Tester ConnectionSpecified Condition
HT (1)−+B (2)0.86 to 1.1
at 20_C (68_F)
Resistance (w/o Headlight beam level control):
Tester ConnectionSpecified Condition
HT (2)−+B (1)0.86 to 1.1
at 20_C (68_F)
(c) Reconnect the A/F sensor connector.
NG REPLACE AIR FUEL RATIO SENSOR
OK
2 INSPECT AIR FUEL RATIO SENSOR HEATER RELAY
(a) Remove the A/F sensor heater relay.
(b) Inspect the A/F sensor heater relay.
Standard:
Tester ConnectionSpecified Condition
1−2Continuity
No continuity
3−5Continuity
(Apply battery voltage to terminals 1 and 2)
(c) Reinstall the A/F sensor heater relay.
NG REPLACE AIR FUEL RATIO SENSOR HEATER
RELAY
OK

A81086
E1 (−)
E12
HAF2 (+)
ECM Connector
−
DIAGNOSTICS ECD SYSTEM (1CD−FTV)(From September, 2003)
05 −309
AVENSIS Supplement (RM1045E)
3 INSPECT ECM(A/F SENSOR HEATER VOLTAGE)
(a) Turn the ignition switch to ON.
(b) Measure the voltage between the applicable terminals of
the E12 ECM connector.
Standard:
Tester ConnectionSpecified Condition
HAF2 (E12 −5) − E1 (E12 −7)9to14V
OK REPLACE ECM (See page 10− 29)
NG

A90355
Wire Harness Side
(w/ Headlight Beam Level Control):
+B
HT
A34
Front View A/F Sensor Connector
A90355
Wire Harness Side
(w/o Headlight Beam Level Control):
+B
HT
A34
Front View A/F Sensor Connector
A81087
E12
HAF2 (+)
ECM Connector
A90544
Wire Harness Side:
A/F Sensor Heater RelayHAF2
05−310
− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
AVENSIS Supplement (RM1045E)
4 CHECK HARNESS AND CONNECTOR(A/F SENSOR−ECM, A/F SENSOR−A/F
SENSOR HEATER RELAY)
(a) Check the harness and the connectors between the ECM
and the A/F sensor.
(1) Disconnect the A34 A/F sensor connector.
(2) Disconnect the E12 ECM connector.
(3) Check the resistance between the wire harness
side connectors.
Standard (Check for open)
(w/ Headlight beam level control):
Tester ConnectionSpecified Condition
HT (A34−1)−HAF2 (E12−5)Below 1

Standard (Check for open)
(w/o Headlight beam level control):
Tester ConnectionSpecified Condition
HT (A34−2)−HAF2 (E12−5)Below 1

Standard (Check for short)
(w/ Headlight beam level control):
Tester ConnectionSpecified Condition
HT (A34−1) or HAF2 (E12−5)−Body ground10 k
or higher
Standard (Check for short)
(w/o Headlight beam level control):
Tester ConnectionSpecified Condition
HT (A34−2) or HAF2 (E12−5)−Body ground10 k
or higher
(4) Reconnect the A/F sensor connector.
(5) Reconnect the ECM connector.
(b) Check the harness and connectors between the A/F sen-
sor connector and the A/F sensor heater relay.
(1) Disconnect the A34 A/F sensor connector.
(2) Remove the A/F sensor heater relay from the en-
gine room R/B.
(3) Check the resistance between the wire harness
side connectors.
Standard (Check for open)
(w/ Headlight beam level control):
Tester ConnectionSpecified Condition
+B (A34−2)−A/F sensor heater relay (3)Below 1

Standard (Check for open)
(w/o Headlight beam level control):
Tester ConnectionSpecified Condition
+B (A34−1)−A/F sensor heater relay (3)Below 1

Standard (Check for short)
(w/ Headlight beam level control):
Tester ConnectionSpecified Condition
+B (A34−2) or A/F sensor heater relay (3)−Body ground10 k
or higher

−
DIAGNOSTICS ECD SYSTEM (1CD−FTV)(From September, 2003)
05 −311
AVENSIS Supplement (RM1045E)
Standard (Check for short)
(w/o Headlight beam level control):
Tester ConnectionSpecified Condition
+B (A34 −1) or A/F sensor heater relay (3) − Body ground10 k
or higher
(4) Reconnect the A/F sensor connector.
(5) Reinstall the A/F sensor heater relay.
NG REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE ECM (See page 10− 29)

054JD−11
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
05 −299
AVENSIS Supplement (RM 1045E)
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Parameters listed in the chart may be different than your readings depending on the type of instrument used
and other factors.
During the DTC check, refer to the table below if a malfunction code is displayed. For details about each
code, refer to the page number in the DTC Chart’s left column.
DTC No.
(See Page)Detection ItemTrouble Area* 1
CHK ENGMemory
P003 1
(05 −305)Oxygen (A/F) Sensor Heater
Control Circuit Low (Bank 1Sen-
sor 1)SOpen in A/F sensor heater circuit
S A/F sensor heater
S A/F sensor heater relay
S ECM
ff
P0045
(05 −312)Turbo/Super Charger Boost Con-
trol Solenoid Circuit / OpenSVRV
S Open or short in VRV circuit
S ECM
ff
P0087
(05 −314)Fuel Rail/System Pressure −To o
LowS Open or short in fuel pressure sensor circuit
S Fuel pressure sensor
S ECM
ff
P0088
(05 −32 1)Fuel Rail/System Pressure −To o
High
S Supply pump (Suction control valve)
S Pressure discharge valve
S Short in supply pump (Suction control valve) circuit
S Open in pressure discharge valve circuit
S ECM
ff
P0093
(05 −328)Fuel System Leak Detected −
Large Leak
S Fuel line between supply pump and common rail
S Fuel line between common rail and injector
S Supply pump
S Common rail
S Injector (P 1238 is set simultaneously)
S Pressure discharge valve
S Open or short in EDU circuit (P0200 is set simultaneously)
S Open or short in injector circuit (P0200 and P 1238 are set
simultaneously)
S EDU (P0200 is set simultaneously)
S ECM
ff
P0095
(05 −33 1)Intake Air Temperature Sensor 2
Circuit
S Open or short in diesel turbo inlet air temperature sensor cir-ff
P0097
(05 −33 1)Intake Air Temperature Sensor 2
Circuit Low
SOpenorshortindieselturboinletairtemperaturesensorcir-
cuit
S Diesel turbo inlet air temperature sensor
ff
P0098
(05 −33 1)Intake Air Temperature Sensor 2
Circuit High
p
S ECMff
P0 100
(05 −336)Mass or Volume Air Flow Circuit
SOpen or short in mass air flow meter circuit
S Mass air flow meter
S ECM
ff
P0 101
(05 −34 1)Mass or Volume Air Flow Circuit
Range/Performance ProblemS Mass air flow meterff
P0 102
(05 −336)Mass or Volume Air Flow Meter
Circuit Low InputSOpen or short in mass air flow meter circuit
SMassairflowmeter
ff
P0 103
(05 −336)Mass or Volume Air Flow Meter
Circuit High InputSMass air flow meter
S ECM
ff
P0 105
(05 −342)Manifold Absolute Pressure/
Barometric Pressure Circuit
SOpen or short in manifold absolute pressure sensor circuit
S Manifold absolute pressure sensor
S Turbocharger assembly
S EGR valve assembly
S ECM
ff
P0 106
(05 −346)Manifold Absolute Pressure/
Barometric Pressure Circuit
Range/Performance Problem
SManifold absolute pressure sensorff

05−300
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
AVENSIS Supplement (RM 1045E)
DTC No.
(See Page) Memory
*
1
CHK ENG
Trouble Area
Detection Item
P0 107
(05 −342)Manifold Absolute Pressure/
Barometric Pressure Circuit Low
InputSOpen or short in manifold absolute pressure sensor circuit
S Manifold absolute pressure sensor
Turbochargerassy
ff
P0 108
(05 −342)Manifold Absolute Pressure/
Barometric Pressure Circuit High
InputSTurbochargerassy
S EGR valve assy
S ECM
ff
P0 110
(05 −347)Intake Air Temperature Circuit
Ohtiitkittiit
ff
P0 112
(05 −347)Intake Air Temperature Circuit
Low InputSOpen or short in intake air temperature sensor circuit
S Intake air temperature sensor (built in mass air flow meter)
SECM
ff
P0 113
(05 −347)Intake Air Temperature Circuit
High InputSECM
ff
P0 115
(05 −352)Engine Coolant Temperature Cir-
cuitSOpen or short in engine coolant temperature sensor circuit
S Engine coolant temperature sensor
S ECM
ff
P0 116
(05 −356)Engine Coolant Temperature Cir-
cuit Range/Performance Prob-
lem
SEngine coolant temperature sensorff
P0 117
(05 −352)Engine Coolant temperature Cir-
cuit Low InputSOpen or short in engine coolant temperature sensor circuit
SEnginecoolanttemperaturesensor
ff
P0 118
(05 −352)Engine Coolant temperature Cir-
cuit High InputSEngine coolant temperature sensor
S ECM
ff
P0 120
(05 −357)Throttle/Pedal Position Sensor/
Switch ”A” Circuit
SOpen or short in intake shutter (throttle valve) position sensor
circuit
S Intake shutter (throttle valve) position sensor
S ECM
ff
P0 122
(05 −357)Throttle/Pedal Position Sensor/
Switch ”A” Circuit Low Input
SIntake shutter (throttle valve) position sensor
S Open or short in VLU circuit
S Open in VC circuit
S ECM
ff
P0 123
(05 −357)Throttle/Pedal Position Sensor/
Switch ”A” Circuit High Input
SIntake shutter (throttle valve) position sensor
S Open in E2 circuit
S VC and VTA circuits are short −circuited
S ECM
ff
P0 168
(05 −36 1)Fuel Temperature Too HighS Fuel temperature sensorff
P0 180
(05 −362)Fuel Temperature Sensor ”A”
Circuit
Openorshortinfueltemperaturesensorcircuit
ff
P0 182
(05 −362)Fuel Temperature Sensor ”A”
Circuit Low InputSOpen or short infuel temperature sensor circuit
S Fuel temperature sensor
SECM
ff
P0 183
(05 −362)Fuel Temperature Sensor ”A”
Circuit High InputSECM
ff
P0 190
(05 −314)Fuel Rail Pressure Sensor Cir-
cuitSOpen or short in fuel pressure sensor circuit
S Fuel pressure sensor
S ECM
ff
P0 191
(05 −367)Fuel Rail Pressure Sensor Cir-
cuit Range/PerformanceSFuel pressure sensorff
P0 192
(05 −314)Fuel Rail Pressure Sensor Cir-
cuit Low InputSOpen or short in fuel pressure sensor circuit
SFuelpressuresensor
ff
P0 193
(05 −314)Fuel Rail Pressure Sensor Cir-
cuit High InputSFuel pressure sensor
S ECM
ff
P0200
(05 −368)Injector Circuit / Open
SOpen or short in EDU circuit
S Injector
S EDU
S ECM
ff

−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
05 −30 1
AVENSIS Supplement (RM 1045E)
DTC No.
(See Page) Memory
*
1
CHK ENG
Trouble Area
Detection Item
P0234
(05 −376)Turbo/Super Charger Overboost
ConditionSVRV
S Open or short in VRV circuit
S Turbocharger
ff
P0299
(05 −376)Turbo/Super Charger Under-
boost
Turbocharger
SEGR valve
S Vacuum hose
S ECM
ff
P0335
(05 −38 1)Crankshaft Position Sensor ”A”
CircuitS Open or short in crankshaft position sensor circuit
S Crankshaft position sensorff
P0339
(05 −38 1)Crankshaft Position Sensor ”A”
Circuit Intermittent
Crankshaftpositionsensor
S Signal plate (crankshaft timing pulley)
S ECM
f
P0340
(05 −384)Camshaft Position Sensor ”A”
Circuit (Bank 1or Single Sensor)
SOpen or short in camshaft position sensor circuit
S Camshaft position sensor
S Camshaft timing pulley
S ECM
ff
P0380
(05 −386)Glow Plug/Heater Circuit ”A”
SOpen or short in glow plug circuit
S Glow fuse
S Glow plug relay
S Glow plug
S ECM
ff
P0400
(05 −393)Exhaust Gas Recirculation Flow
SEGR valve stuck
S EGR valve does not move smoothly
S Open or short in EGR circuit
S Open or short in EGR valve position sensor circuit
S EGR valve position sensor
S ECM
ff
P0405
(05 −399)Exhaust Gas Recirculation Sen-
sor ”A” Circuit LowSOpen or short in EGR valve position sensor circuit
SEGRvalvepositionsensor
ff
P0406
(05 −399)Exhaust Gas Recirculation Sen-
sor ”A” Circuit HighSEGR valve position sensor
S ECM
ff
P0488
(05 −403)Exhaust Gas Recirculation
Throttle Position Control Range/
Performance
SIntake shutter stuck
S Intake shutter does not move smoothly
S Open or short in intake shutter circuit
S Open or short in intake shutter position sensor circuit
S Intake shutter position sensor (built in intake shutter valve)
S ECM
ff
P0500
(05 −408)Vehicle Speed Sensor ”A”
SOpen or short in speed sensor circuit
S Speed sensor
S Combination meter
S ECM
S Skid control ECU
ff
P0504
(05 −411 )Brake Switch ”A”/”B” Correlation
SShort in stop lamp switch signal circuit
S Stop lamp switch
S ECM

f
P0544
(05 −415)Exhaust Gas Temperature Sen-
sor Circuit (Bank 1Sensor 1)ff
P0545
(05 −415)Exhaust Gas Temperature Sen-
sor Circuit Low (Bank 1Sensor
1 )SOpen or short in exhaust gas temperature sensor (on up
stream) circuit
S Exhaust gas temperature sensor (on up stream)
ff
P0546
(05 −415)Exhaust Gas Temperature Sen-
sor Circuit High (Bank 1Sensor
1 )
gp(p)
SECM
ff
P0560
(05 −422)System Voltage
SOpen in back −up power source circuit
S Low battery voltage
S ECM
ff