2005 TOYOTA AVENSIS Circuit

05JOB–03
– DIAGNOSTICSSFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
05–21
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
FAIL–SAFE CHART
If any of the following DTCs are recorded, the ECM enters fail–safe mode.
DTC No.Fail–Safe OperationFail–Safe Deactivation Condition
P0031
P0032Heated oxygen sensor (Sensor 1) heater is turned offIgnition switch turned to OFF
P0037
P0038Heated oxygen sensor (Sensor 2) heater is turned offIgnition switch turned to OFF
P0100
P0102
P0103Ignition timing is calculated from engine RPM and Throttle
Position (TP)”Pass” condition detected
P0110
P0112
P0113
Intake Air Temperature (IAT) is fixed at 20
C (68
F)”Pass” condition detected
P0115
P0117
P0118
Engine Coolant Temperature (ECT) is fixed at 80
 
”Pass” condition detected
P0120
P0122
P0123
P0220
P0222
P0223
P2102
P2103
P2111
P2112
P2118
P2119
P2135
When Electronic Throttle Control System (ETCS) is mal-
functioning, electric current to throttle actuator is cut off and
throttle valve returns to throttle position (TP) 16 by its
spring.
Then, required engine power is calculated using ignition
timing and Accelerator Pedal Position (APP). Engine is
controlled by intermittent fuel–cut.
As a result, fully slowly depressing accelerator pedal en-
ables driving at minimum speed. However, quickly depress-
ing pedal would vary vehicle speed remarkably.
”Pass” condition detected followed by the ignition switch
turned to OFF
P0121Fuel is cut intermittently”Pass” condition detected followed by the ignition switch
turned to OFF
P0325
P0327
P0328
Maximum ignition timing retardationIgnition switch turned to OFF
P0351
P0352
P0353
P0354
Fuel is cut”Pass” condition detected
P2120
P2121
P2122
P2123
P2125
P2127
P2128
P2138
Accelerator Pedal Position (APP) sensor has main circuit
and associate circuit. When one of circuits is malfunction-
ing, APP is calculated by output of other circuit. When both
of circuits are malfunctioning, it is interpreted that accelera-
tor pedal is releasing. As a result, throttle valve is closed
and engine idles.
”Pass” condition detected followed by the ignition switch
turned to OFF

05–106
–
DIAGNOSTICS SFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
DTC P0171 SYSTEM TOO LEAN (BANK 1)
DTC P0172 SYSTEM TOO RICH (BANK 1)
CIRCUIT DESCRIPTION
The fuel trim is related to the feedback compensation value, not to the bas\
ic injection time. The fuel trim in-
cludes the short–term fuel trim and the long–term fuel trim.
The short–term fuel trim is the short–term fuel compensation used to \
maintain the air–fuel ratio at its ideal
theoretical value. The signal from the heated oxygen sensor indicates whether the air–fuel r\
atio is rich or
lean compared to the ideal theoretical value, triggering a reduction in the \
fuel volume if the air–fuel ratio is
rich, and an increase in the fuel volume if it is lean.
The long–term fuel trim is the overall fuel compensation in order to bal\
ance the short–term fuel trim for a
continual deviation from the central value by individual engine differences, operating environment and age
deterioration.
If both the short–term fuel trim and the long–term fuel trim are l\
ean or rich beyond a standard level, it is de-
tected as a malfunction in the SFI system. The ECM illuminates the MIL and the\
DTC is set.
DTC No.DTC Detection ConditionTrouble Area
P0171
When air–fuel ratio feedback is stable after warming up engine,
fuel trim is considerably in error on lean side
(2 trip detection logic)
 Air induction system
 Injector blockage
 Mass air flow meter
 Engine coolant temperature sensor
 Fuel pressure
 Gas leakage in exhaust system
 Open or short in heated oxygen sensor (sensor 1) circuit
 Heated oxygen sensor (sensor 1)
 PCV valve and hose
 PCV hose connection
 ECM
P0172
When air–fuel ratio feedback is stable after warming up engine,
fuel trim is considerably in error on rich side
(2 trip detection logic)
Injector leakage or blockage
 Mass air flow meter
 Engine coolant temperature sensor
 Ignition system
 Fuel pressure
 Gas leakage in exhaust system
 Open or short in heated oxygen sensor (sensor 1) circuit
 Heated oxygen sensor (sensor 1)
 ECM
HINT:
When DTC P0171 is set, the actual air–fuel ratio is lean. When DTC P0172 is set, the actual air–fuel\

ratio is rich.
If the vehicle runs out of fuel, the air–fuel ratio is lean and DTC P01\
71 may be set. The MIL then illumi-
nates.
If the total of the short–term fuel trim value and long–term fuel trim value is within
20 %, the system
is functioning normally.
WIRING DIAGRAM
Refer to DTC P0130 on page 05–74.
05KO5–02

+25 %
–12.5 %
More than 0.5 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)Main Suspect
Trouble Area
OK
+25 %
–12.5 %
More than 0.5 V
Less than 0.4V
Injection volume
Output voltage
+25 %
–12.5 %
More than 0.5 V
Less than 0.4V
Injection volume
Output voltage
Sensor 1: front sensor
(Sensor 1, heater, sensor 1
circuit)
+25 %
–12.5 %
More than 0.5 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 actual
air–fuel ratio
(Injector, fuel pressure, gas
leakage in exhaust system,
etc.) OK
OK
OK
Almost no reaction

Sensor 2: rear sensor
(Sensor 2, heater, sensor 2
circuit)
Almost no reaction Almost no reactionAlmost no reaction
05–108
– DIAGNOSTICSSFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
The following A/F Control procedure enables the technician to check and graph the voltage output of both
the heated oxygen sensors.
To display the graph, select the following menu items on the tester: View / Line Graph.
NOTICE:
If the vehicle is short of fuel, the air–fuel ratio becomes lean and the heated oxygen sensor DTCs will
be recorded, and the MIL then illuminates.
HINT:
Read freeze frame data using the intelligent tester II. Freeze frame data record the engine condition
when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the
vehicle was moving or stationary, if the engine was warmed up or not, if the air–fuel ratio was lean or
rich, and other data from the time the malfunction occurred.
A high heated oxygen sensor (sensor 1) voltage (0.5 V or more) could be caused by a rich air–fuel
mixture. Check for conditions that would cause the engine to run rich.
A low heated oxygen sensor (sensor 1) voltage (0.4 V or less) could be caused by a lean air–fuel mix-
ture. Check for conditions that would cause the engine to run lean.

A78602
Reference (Sensor 2 System Diagram):Heated Oxygen Sensor
EFI Relay
Heater
Sensor OX1B
HT1BECM
From
Battery EFI Fuse
E2MREL
OX
HT
E1
+B
05–46
–
DIAGNOSTICS SFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
DTC P0037 OXYGEN SENSOR HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 2)
DTC P0038 OXYGEN SENSOR HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 2)
CIRCUIT DESCRIPTION
Refer to DTC P0130 on page 05–74.
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
P0037Heated current is 0.25 A or less when heater operates
(1 trip detection logic)
 Open in heater circuit of heated oxygen sensor
 Heated oxygen sensor heater (sensor 2)
 EFI relay
 ECM
P0038Heater current exceeds 2 A when heater operates
(1 trip detection logic)
Short in heater circuit of heated oxygen sensor
 Heated oxygen sensor heater (sensor 2)
 EFI relay
 ECM
HINT:
Sensor 1 refers to the sensor mounted in front of the Three–Way Catalytic Converter (TWC) and lo-
cated near the engine assembly.
Sensor 2 refers to the sensor mounted behind the TWC and located far fro\
m the engine assembly.
WIRING DIAGRAM
Refer to DTC P0130 on page 05–74.
05KNW–02

A78602
EFI RelayHeater
Sensor OX1A
HT1AECM
From
Battery EFI Fuse
E2
MREL
Reference (Sensor 1 System Diagram):
Heated Oxygen Sensor
OX
HT
E1
+B
–
DIAGNOSTICS SFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
05–43
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
DTC P0031 OXYGEN SENSOR HEATER CONTROL
CIRCUIT LOW (BANK 1 SENSOR 1)
DTC P0032 OXYGEN SENSOR HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 1)
CIRCUIT DESCRIPTION
Refer to DTC P0130 on page 05–74.
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
P0031Heated current is 0.8 A or less when heater operates
(1 trip detection logic)
 Open or short in heater circuit of heated oxygen sensor
 Heated oxygen sensor heater (sensor 1)
 EFI relay
 ECM
P0032Heated current exceeds 10 A when the heater operates
(1 trip detection logic)
Open or short in heater circuit of heated oxygen sensor
 Heated oxygen sensor heater (sensor 1)
 EFI relay
 ECM
HINT:
Sensor 1 refers to the sensor mounted in front of the Three–Way Catalytic Converter (TWC) and lo-
cated near the engine assembly.
Sensor 2 refers to the sensor mounted behind the TWC and located far fro\
m the engine assembly.
WIRING DIAGRAM
Refer to DTC P0130 on page 05–74.
05KNV–02

05–42
–
DIAGNOSTICS SFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
DTC P0016 CRANKSHAFT POSITION – CAMSHAFT POSITION CORRELATION (BANK 1 SENSOR
A)
CIRCUIT DESCRIPTION
Refer to DTC P0335 and P0339 on page 05–136.
DTC No.DTC Detection ConditionTrouble Area
P0016Deviation in crankshaft position sensor signal and camshaft
position signal (2 trip detection logic)Mechanical system (Jumped tooth of timing chain or chain
stretched)
 ECM
WIRING DIAGRAM
Refer to DTC P0335 and P0339 on page 05–136.
INSPECTION PROCEDURE
Read freeze frame data using the intelligent tester II. Freeze frame data record the engine condition\
when
malfunctions are detected. When troubleshooting, freeze frame data can h\
elp determine if the vehicle was
moving or stationary, if the engine was warmed up or not, if the air–fuel ratio was lean \
or rich, and other data
from the time the malfunction occurred.
1 CHECK VALVE TIMING(CHECK FOR LOOSENESS AND JUMPED TEETH ON
TIMING CHAIN) (See page 14–49 of Pub. No. RM1018E AVENSIS)
(a) Check for looseness or a jumped tooth of the timing chain.
OK: The matchmarks of the crankshaft pulley and camshaft pulley are alig\
ned.
NG ADJUST VALVE TIMING (See page 14–49 of Pub.No. RM1018E AVENSIS)
(REPAIR OR REPLACE TIMING CHAIN)
OK
REPLACE ECM (See page 10–65 of Pub. No. RM1018E AVENSIS)
05B57–07

054JD–22
–
DIAGNOSTICS SFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
05–27
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Parameters listed in the chart may not be exactly the same as your readings due to\
factors such as the type
of instrument.
If a DTC is displayed during the DTC check in check mode, check the circui\
t for the DTC listed in the table
below. For details of each DTC, refer to the ’’See page’’ under the respective ’’DTC No.’’ in this chart.
DTC No.
(See Page)Detection ItemTrouble Area*1
MILMemory
P0010
( 05–34 )Camshaft Position ”A” Actuator
Circuit (Bank 1)Open or short in oil control valve circuit
 Oil control valve
 ECM

P0011
( 05–38 )Camshaft Position ”A” –Timing
Over–Advanced or System Per-
formance (Bank 1)Valve timing
 Oil control valve
 Camshaft timing gear assy
 ECM

P0012
( 05–38 )Camshaft Position ”A” –Timing
Over– Retarded (Bank 1)
Valve timing
 Oil control valve
 Camshaft timing gear assy
 ECM

P0016
( 05–42 )Crankshaft Position – Camshaft
Position Correlation (Bank 1
Sensor A)Mechanical system (Jumped tooth of timing chain or chain
stretched)
 ECM

P0031
( 05–43 )Oxygen Sensor Heater Control
Circuit Low (Bank 1 Sensor 1)
Open or short in heater circuit of heated oxygen sensor
 Heated oxygen sensor heater (Sensor 1)
 EFI relay
 ECM

P0032
( 05–43 )Oxygen Sensor Heater Control
Circuit High (Bank 1 Sensor 1)
Open or short in heater circuit of heated oxygen sensor
 Heated oxygen sensor heater (Sensor 1)
 EFI relay
 ECM

P0037
( 05–46 )Oxygen Sensor Heater Control
Circuit Low (Bank 1 Sensor 2)
Open in heater circuit of heated oxygen sensor
 Heated oxygen sensor heater (Sensor 2)
 EFI relay
 ECM

P0038
( 05–46 )Oxygen Sensor Heater Control
Circuit High (Bank 1 Sensor 2)
Short in heater circuit of heated oxygen sensor
 Heated oxygen sensor heater (Sensor 2)
 EFI relay
 ECM

P0100
( 05–49 )Mass Air Flow Circuit Malfunc-
tionOpen or short in mass air flow meter circuit
 Mass air flow meter
 ECM

P0102
( 05–49 )Mass or Volume Air Flow Circuit
Low InputOpen in mass air flow meter circuit
 Mass air flow meter
 ECM

P0103
( 05–49 )Mass or Volume Air Flow Circuit
High InputShort in mass air flow meter circuit
 Mass air flow meter
 ECM

P0110
( 05–55 )Intake Air Temperature Circuit
Open or short in intake air temperature sensor circuit
 Intake air temperature sensor (built into mass air flow meter)
 ECM

P0112
( 05–55 )Intake Air Temperature Circuit
Low InputShort in intake air temperature sensor circuit
 Intake air temperature sensor (built into mass air flow meter)
 ECM

P0113
( 05–55 )Intake Air Temperature Circuit
High InputOpen in intake air temperature sensor circuit
 Intake air temperature sensor (built into mass air flow meter)
 ECM


05–28
–
DIAGNOSTICS SFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E) DTC No.
(See Page) Memory
*1
MIL
Trouble Area
Detection Item
P0115
( 05–60 )Engine Coolant Temperature Cir-
cuitOpen or short in engine coolant temperature sensor circuit
 Engine coolant temperature sensor
 ECM

P0116
( 05–65 )Engine Coolant Temperature Cir-
cuit Range/Performance Prob-
lem
Engine coolant temperature sensor
P0117
( 05–60 )Engine Coolant Temperature Cir-
cuit Low InputShort in engine coolant temperature sensor circuit
 Engine coolant temperature sensor
 ECM

P0118
( 05–60 )Engine Coolant Temperature Cir-
cuit High InputOpen in engine coolant temperature sensor circuit
 Engine coolant temperature sensor
 ECM

P0120
( 05–66 )Throttle/Pedal Position Sensor/
Switch ”A” CircuitThrottle position sensor (built into throttle body)
 ECM
P0121
( 05–73 )Throttle/Pedal Position Sensor/
Switch ”A” Circuit Range/Perfor-
mance Problem
Throttle position sensor (built into throttle body)
P0122
( 05–66 )Throttle/Pedal Position Sensor/
Switch ”A” Circuit Low Input
Throttle position sensor (built into throttle body)
 Short in VTA1 circuit
 Open in VC circuit
 ECM

P0123
( 05–66 )Throttle/Pedal Position Sensor/
Switch ”A” Circuit High Input
Throttle position sensor (built into throttle body)
 Open in VTA1 circuit
 Open in E2 circuit
 VC and VTA1 circuits are short–circuited
 ECM

P0130 *4
( 05–74 )Oxygen Sensor Circuit Malfunc-
tion (Bank 1 Sensor 1)
Open or short in heated oxygen sensor circuit
 Heated oxygen sensor (Sensor 1)
 Heated oxygen sensor heater (Sensor 1)
 EFI relay
 Air induction system
 Fuel pressure
 Injector
 ECM

P0133 *4
( 05–84 )Oxygen Sensor Circuit Slow Re-
sponse (Bank 1 Sensor 1)
Open or short in heated oxygen sensor circuit
 Heated oxygen sensor (Sensor 1)
 Heated oxygen sensor heater (Sensor 1)
 EFI relay
 Air induction system
 Fuel pressure
 Injector
 ECM

P0134
( 05–91 )Oxygen Sensor Circuit No Activ-
ity Detected (Bank 1 Sensor 1)
Open or short in heated oxygen sensor circuit
 Heated oxygen sensor (Sensor 1)
 PCV valve and hose
 EFI relay
 Air induction system
 Fuel pressure
 Injector
 Gas leakage in exhaust system
 ECM

P0136
( 05–100 )Oxygen Sensor Circuit Malfunc-
tion (Bank 1 Sensor 2)
Open or short in heated oxygen sensor circuit
 Heated oxygen sensor (sensor 2)
 Heated oxygen sensor heater (sensor 2)
 EFI relay