2005 TOYOTA AVENSIS fuel

05–170
– DIAGNOSTICSSFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
DTC P0604 INTERNAL CONTROL MODULE RANDOM
ACCESS MEMORY (RAM) ERROR
DTC P0606 ECM/PCM PROCESSOR
DTC P0607 CONTROL MODULE PERFORMANCE
DTC P0657 ACTUATOR SUPPLY VOLTAGE
CIRCUIT/OPEN
CIRCUIT DESCRIPTION
The ECM continuously monitors its internal memory status, internal circuits, and output signals to the throttle
actuator. This self–check ensures that the ECM is functioning properly. If any malfunction is detected, the
ECM will set appropriate DTCs and illuminate the MIL.
The ECM memory status is diagnosed by internal ”mirroring” of the main CPU and the sub CPU to detect
Random Access Memory (RAM) errors. The two CPUs also perform continuous mutual monitoring.
DTC No.DTC Detection ConditionTrouble Area
P0604
P0606
P0607
P0657
ECM internal errorECM
INSPECTION PROCEDURE
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.
REPLACE ECM (See page 10–65 of Pub. No. RM1018E AVENSIS)
05B5M–07

A93655
17
E10SPDECM
V–W 18
C11 Combination Meter
J/C
5
E13 E15 V
BR
EHJ10H
V–W
(LHD) J20H
(RHD)J10H
(LHD) J20H
(RHD)
– DIAGNOSTICSSFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
05–159
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
WIRING DIAGRAM
INSPECTION PROCEDURE
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.
1 CHECK OPERATION OF SPEEDOMETER
(a) Drive the vehicle and check if the operation of the speedometer in the combination meter is normal.
HINT:
The vehicle speed sensor is operating normally if the speedometer reading is normal.
NG CHECK SPEEDOMETER CIRCUIT
(See page 05–1510 of Pub. No. RM1018E AVEN-
SIS)
OK

A96006
2
EFI
1 1
FL MAINW–BEFI Relay
1 43 5
2
EA1
B–W
V5
EVAP VSV
219
E12
MREL 4
E10 44
44
42 1
B–W
W–G 1 IE1 2
GR13
EC 1 1A
4A
4B1
1
B–G
BatteryB–W
EFI
No. 2 B–Y
B–G
EVP1ECM
Engine
Room
R/B No.1Engine
Room
R/B No.4 Engine Room R/B No.4
GR
– DIAGNOSTICSSFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
05–155
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
DTC P0443 EVAPORATIVE EMISSION CONTROL
SYSTEM PURGE CONTROL VALVE CIRCUIT
CIRCUIT DESCRIPTION
In order to reduce hydrocarbon (HC) emissions, evaporated fuel from the fuel tank is routed through the char-
coal canister to the intake manifold for combustion in the cylinders.
The ECM changes the duty signal to the EVAP VSV so that the intake of HC emissions is appropriate for
the driving conditions (engine load, engine speed, vehicle speed, etc.) after the engine is warmed up.
DTC No.DTC Detection ConditionTrouble Area
P0443Proper response to ECM command does not occur (1 trip
detection logic)Open or short in EVAP VSV circuit
EVAP VSV
ECM
WIRING DIAGRAM
05KO8–02

A80362
VSV is ON VSV is OFFE
F
E
F
Air
A18294
E13
ECM Connector
E01
EVP1E12
05–156
–
DIAGNOSTICS SFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
INSPECTION PROCEDURE
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 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 PERFORM ACTIVE TEST USING INTELLIGENT TESTER II(EVAP VSV)
(a) Disconnect the vacuum hose of the EVAP VSV.
(b) Connect the intelligent tester II to the DLC3.
(c) Start the engine and turn the intelligent tester II ON.
(d) Select the following menu items: Powertrain / Engine and ECT / Active Test / Purge VSV. Press the right or left but-
ton.
(e) Check if the disconnected port applies suction to your fin-
ger when operating the EVAP VSV using the intelligent
tester II.
Standard:
Tester OperationSpecified Condition
VSV is ONApplies suction to your finger
VSV is OFFApplies no suction to your finger
(f) Reconnect the vacuum hose.
OK CHECK FOR INTERMITTENT PROBLEMS (See page 05–9 )
NG
2 INSPECT ECM(CHECK VOLTAGE)
(a) Turn the ignition switch to ON.
(b) Measure the voltage between the terminals of the E12 and E13 ECM connectors.
Standard:
Tester ConnectionSpecified Condition
EVP1 (E12–19) – E01 (E13–7)9 to 14 V
OK REPLACE ECM (See page 10–65 of Pub. No. RM1018E AVENSIS)
NG
3 INSPECT VACUUM SWITCHING VALVE(OPERATION OF EVAP VSV)
OK: Air flows when the battery voltage is applied to the EVAP VSV. NG REPLACE VACUUM SWITCHING VALVE
OK

A83860
Waveform of Heated
Oxygen Sensor
(in front of TWC)Waveform of Heated
Oxygen Sensor
(behind TWC)
Waveform of Heated
Oxygen Sensor
(behind TWC) Normal Catalyst
Deteriorated Catalyst Waveform of Heated
Oxygen Sensor
(in front of TWC) 05–150
– DIAGNOSTICSSFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
DTC P0420 CATALYST SYSTEM EFFICIENCY BELOW
THRESHOLD (BANK 1)
CIRCUIT DESCRIPTION
This vehicle has two Heated Oxygen (O2) sensors. One is located in front of the Three–Way Catalyst Con-
verter (TWC), and the other is mounted behind the TWC. Each signal output of the sensors is converted into
a waveform inside the ECM. The front O2 sensor is used to monitor the air–fuel ratio by the ECM, and whose
signal prompts the ECM to perform air–fuel ratio feedback control. As a result, the air–fuel ratio is balanced,
and the waveform of the front O2 sensor oscillates between rich and lean regularly.
To determine whether or not the catalyst performance has deteriorated, the ECM compares the waveforms
of the front and rear O2 sensors. While the catalyst is functioning normally, the waveform of the rear O2 sen-
sor fluctuates between rich and lean more slowly than the front O2 sensor’s waveform. When the rear O2
sensor ’s waveform frequently fluctuates, it indicates that the catalyst performance deteriorates.
05KO7–02

05–152
–
DIAGNOSTICS SFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
NOTICE:
If the conditions in this test are not strictly followed, no malfunction\
will be detected. If you do not
have the intelligent tester II, turn the ignition switch to OFF after perfor\
ming steps from (d) to (i), then
perform steps (d) to (i) again.
WIRING DIAGRAM
Refer to DTC P0130 on page 05–74.
INSPECTION PROCEDURE
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 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 OTHER DTC OUTPUT(IN ADDITION TO DTC P0420)
(a) Connect the intelligent tester II to the DLC3.
(b) Turn the ignition switch to ON and turn the intelligent tester ll ON.
(c) Select the following menu items: Powertrain / Engine and ECT / DTC.
(d) Read DTCs.
Result:
Display (DTC Output)Proceed To
P0420A
P0420 and other DTCsB
HINT:
If any DTCs other than P0420 are output, troubleshoot those DTCs first.
B GO TO RELEVANT DTC CHART (See page 05–27 )
A
2 CHECK FOR EXHAUST GAS LEAKAGE
OK: No gas leakage. NG REPAIR OR REPLACE EXHAUST GASLEAKAGE POINT
OK
3 INSPECT HEATED OXYGEN SENSOR(SENSOR 1) ( See page 05–74)
NG REPLACE HEATED OXYGEN SENSOR
OK

–
DIAGNOSTICS SFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
05–153
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
4 INSPECT HE ATED OXYGEN SENSOR(SENSOR 2) ( See page 05–100)
OK: During air–fuel ratio feedback, the oxygen sensor output fluctuat\
es between rich and lean.
NG REPLACE HEATED OXYGEN SENSOR
OK
REPLACE THREE–WAY CATALYTIC CONVERTER (BOTH FRONT AND REAR TWC)
NOTICE:
On the damaged bank, replace both the front and rear catalysts.
HINT:
Intelligent tester II only:
Malfunctioning areas can be found by performing the Active Test / A/F Control operation. The A/F Control
operation can determine if the heated oxygen sensor or other potential trouble ar\
eas are malfunctioning or
not.
(a) Perform the Active Test using the intelligent tester II.
HINT:
The A/F Control operation lowers the injection volume by 12.5 % or incre\
ases the injection volume by 25
%. (1) Connect the intelligent tester II to the DLC3.
(2) Start the engine and turn the intelligent tester II ON.
(3) Warm up the engine by running the engine at 2,500 rpm for approximately 3\
minutes.
(4) On the intelligent tester II, select the following menu items: Powertrain \
/ Engine and ECT / ActiveTest / A/F Control.
(5) Select the following monitor items: O2S B1 S1 and O2S B1 S2.
(6) Perform the A/F Control operation with the engine in an idling condition\
(press the right or left
button).
Result:
The heated oxygen sensor reacts in accordance with increases and decreases \
of the injection
volume:
+25 % → Rich output: More than 0.5 V
–12.5 % → Lean output: Less than 0.4 V
NOTICE:
Sensor 1 (front sensor) has an output delay of a few seconds. Sensor 2 (rea\
r sensor) has a maximum
output delay of approximately 20 seconds.

+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
05–154
– 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.