Fuel system TOYOTA AVALON 2001 Service User Guide
[x] Cancel search | Manufacturer: TOYOTA, Model Year: 2001, Model line: AVALON, Model: TOYOTA AVALON 2001Pages: 1897, PDF Size: 26.61 MB
Page 951 of 1897
A00479
Engine Speed
3,000 rpm
Idling
IG SW OFF
Warmed up
3 min. or so
CheckTime (a)(c) (d)
(b) 2,000 rpm
2 sec. 2 sec.
DI-72
- DIAGNOSTICSENGINE
228 Author: Date:
2001 AVALON (RM808U)
CONFIRMATION ENGINE RACING PATTERN
(a) Connect the OBD II scan tool or TOYOTA hand-held tester to the DLC3.
(b) Start engine and warm it up with all the accessories switched OFF until the water temperature is stable.
(c) Race the engine at 2,500 - 3,000 rpm for about 3 min.
(d) When racing the engine at 3,000 rpm for 2 sec. and 2,000 rpm for 2 sec. alternately, check the wave-
form of the heated oxygen sensor (bank 1 sensor 2).
INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected. When troubleshooting, it is useful for determining
whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean
or rich, etc. at the time of the malfunction.
1 Are there any other codes (besides DTC P0420) being output?
YES Go to relevant DTC chart (See page DI-14).
NO
2 Check gas leakage on exhaust system.
NG Repair or replace.
OK
Page 953 of 1897
A10140
ECM
VSV
for EVAP
Charcoal Canister
Fuel Tank Fig. 1
(2)
(3) (4) (6)
(8)
(9)(1)
(5)
Fuel Tank Over
Fill Check Valve
(7)Vapor Pressure
Sensor
VSV for
CCVVSV for
Pressure
Switching
Valve
(10)
(11) DI-74
- DIAGNOSTICSENGINE
230 Author: Date:
2001 AVALON (RM808U)
DTC P0440 Evaporative Emission Control System Mal-
function
DTC P0442 Evaporative Emission Control System Leak
Detected (Small Leak)
CIRCUIT DESCRIPTION
The vapor pressure sensor, VSV for canister closed valve (CCV) and VSV for pressure switching valve are
used to detect abnormalities in the evaporative emission control system.
The ECM decides whether there is an abnormality in the evaporative emission control system based on the
vapor pressure sensor signal.
DTC P0440 or P0442 is recorded by the ECM when evaporative emissions leak from the components within
the dotted line in Fig. 1 below, or when the vapor pressure sensor malfunctions.
DTC No.DTC Detecting ConditionTrouble Area
P0440
P0442After cold starting and when generating certain swift pressure
value in fuel tank enabling not to hold that value (2 trip detec-
tion logic)
Hose or tube cracked, hole, damaged or loose seal ((3) in
Fig. 1)
Fuel tank cap incorrectly installed
Fuel tank cap cracked or damaged
Vacuum hose cracked, holed, blocked, damaged or discon-
nected ((1) or (2) in Fig. 1)
Fuel tank cracked, holed or damaged
Charcoal canister cracked, holed or damaged
Open or short in vapor pressure sensor circuit
Vapor pressure sensor
Fuel tank over fill check valve cracked or damaged
ECM
DI6T6-01
Page 959 of 1897
A10142
ECM
Fuel Tank Charcoal Canister VSV for
EVAP
(1) Fig. 1
(2)
(3) (4)
(5)(6)
(7)
Fuel Tank Over
Fill Check Valve
(10)
(9)
Vapor Pressure
Sensor
VSV for
CCVVSV for
Pressure
Switching Valve
(8)
(11) DI-80
- DIAGNOSTICSENGINE
236 Author: Date:
2001 AVALON (RM808U)
DTC P0441 Evaporative Emission Control System Incor-
rect Purge Flow
DTC P0446 Evaporative Emission Control System Vent
Control Malfunction
CIRCUIT DESCRIPTION
The vapor pressure sensor, VSV for canister closed valve (CCV), VSV for pressure switching valve are used
to detect abnormalities in the evaporative emission control system.
The ECM decides whether there is an abnormality in the evaporative emission control system based on the
vapor pressure sensor signal.
DTCs P0441 and P0446 are recorded by the ECM when evaporative emissions leak from the components
within the dotted line in Fig. 1 below, or when there is a malfunction in either the VSV for EVAP, the VSV for
pressure switching valve, or in the vapor pressure sensor itself.
DI6T7-01
Page 976 of 1897
A10145
ECM
Fuel Tank Charcoal Canister VSV for
EVAPFuel Tank Over
Fill Check Valve
Vapor Pressure Sensor
VSV for
CCVVSV for
Pressure
Switching Valve
- DIAGNOSTICSENGINE
DI-97
253 Author: Date:
2001 AVALON (RM808U)
DTC P0450 Evaporative Emission Control System Pres-
sure Sensor Malfunction
DTC P0451 Evaporative Emission Control System Pres-
sure Sensor Range/Performance
CIRCUIT DESCRIPTION
The vapor pressure sensor, VSV for canister closed valve (CCV) and VSV for pressure switching valve are
used to detect abnormalities in the evaporative emission control system.
The ECM decides whether there is an abnormality in the evaporative emission control system based on the
vapor pressure sensor signal.
DTC P0450 or P0451 is recorded by the ECM when the vapor pressure sensor malfunction.
DTC No.DTC Detecting ConditionTrouble Area
P0450
10 seconds or less after engine starting condition vapor pres-
sure sensor fixed value continues for fixed value or more: (2
trip detection logic)
P0451
Vapor pressure sensor output extremely changes under condi-
tions of (a) and (b): (2 trip detection logic)
(a) Vehicle speed: 0 km/h (0mph), Engine speed: Idling and
VSV for pressure switching valve is OFF
(b) vavor pressure sensor value opening pressure valve of
charcoal canisterOpen or short in vapor pressure sensor circuit
Vapor pressure sensor
ECM
DI081-04
Page 981 of 1897
P01559
Throttle Valve
From
Air
Cleaner
Signal
ECM
ValveIAC Valve
To Cylinders Intake Air Chamber
A11664
From Battery2G1 2
4 EFI
No.1EFI Relay
1 23
52A
2B 2F
J7
J/C IAC Valve
G-B
BR
21
3E4ECM
RSO
E01
EC26
A B-W
L-O
BRA
4EFI
No.2
B
W-B
EDEngine Room J/B
EBA
From
Terminal
MREL of
ECM
DI-102
- DIAGNOSTICSENGINE
258 Author: Date:
2001 AVALON (RM808U)
DTC P0505 Idle Control System Malfunction
CIRCUIT DESCRIPTION
The rotary solenoid type IAC valve is located in front of the in-
take air chamber and intake air bypassing the throttle valve is
directed to the IAC valve through a passage.
In this way the intake air volume bypassing the throttle valve is
regulated, controlling the engine speed.
The ECM operates only the IAC valve to perform idle-up and
provide feedback for the target idling speed.
DTC No.DTC Detecting ConditionTrouble Area
P0505Idle speed continues to vary greatly from the target speed (2
trip detection logic)
Open or short in IAC valve circuit
IAC valve is stuck or closed
Open or short in A/C signal circuit
Air induction system
ECM
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected. When troubleshooting, it is useful for determining
whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean
or rich, etc. at the time of the malfunction.
DI083-09
Page 985 of 1897
DI-106
- DIAGNOSTICSENGINE
262 Author: Date:
2001 AVALON (RM808U)
DTC P1130 A/F Sensor Circuit Range/Performance Mal-
function (Bank 1 Sensor 1)
DTC P1150 A/F Sensor Circuit Range/Performance Mal-
function (Bank 2 Sensor 1)
CIRCUIT DESCRIPTION
Refer to DTC P0125 on page DI-43.
DTC No.DTC Detecting ConditionTrouble Area
Voltage output* of A/F sensor remains at 3.8 V or more, or 2.8
V or less, during engine running after the engine is warmed up
(2 trip detection logic)
*: Output value changes at inside of ECM only
Open or short in A/F sensor circuit
A/F sensor
P1130
P1150Voltage output* of A/F sensor does not change from 3.30 V,
during engine running after the engine is warmed up (2 trip
detection logic)
*: Output value changes at the inside of ECM onlyAir induction system
Fuel pressure
Injector
ECM
Open or short in A/F sensor circuit (2 trip detection logic)
HINT:
After confirming DTC P1130, use the OBD II scan tool or TOYOTA hand-held tester to confirm voltage
output of A/F sensor (AFS B1 S1/O2S B1 S1) from the CURRENT DATA.
The A/F sensor's output voltage and the short-term fuel trim value can be read using the OBD II scan
tool or TOYOTA hand-held tester.
The ECM controls the voltage of the AFR+, AFL+, AFR- and AFL- terminals of the ECM to the fixed
voltage. Therefore, it is impossible to confirm the A/F sensor output voltage without the OBDII scan
tool or TOYOTA hand-held tester.
OBD II scan tool (excluding TOYOTA hand-held tester) displays the one fifth of the A/F sensor output
voltage which is displayed on the TOYOTA hand-held tester.
WIRING DIAGRAM
Refer to DTC P0125 on page DI-43.
DI2H7-03
Page 988 of 1897
- DIAGNOSTICSENGINE
DI-109
265 Author: Date:
2001 AVALON (RM808U)
4 Check resistance of A/F sensor heater (See page SF-79).
NG Replace A/F sensor.
OK
5 Check air induction system (See page SF-1).
NG Repair or replace.
OK
6 Check fuel pressure (See page SF-6).
NG Check and repair fuel pump, pressure regulator,
fuel pipe line and filter (See page SF-1).
OK
7 Check injector injection (See page SF-23).
NG Replace injector.
OK
Replace A/F sensor.
8 Perform confirmation driving pattern (See page DI-106).
Go
Page 990 of 1897
- DIAGNOSTICSENGINE
DI-1 11
267 Author: Date:
2001 AVALON (RM808U)
DTC P1133 A/F Sensor Circuit Response Malfunction
(Bank 1 Sensor 1)
DTC P1153 A/F Sensor Circuit Response Malfunction
(Bank 2 Sensor 1)
CIRCUIT DESCRIPTION
Refer to DTC P0125 on page DI-43.
DTC No.DTC Detecting ConditionTrouble Area
P1133
P1153
After engine is warmed up, and during vehicle driving at engine
speed 1,400 rpm or more and vehicle speed 60 km/h (38 mph)
or more, if the response characteristic of A/F sensor becomes
deteriorated (2 trip detection logic)
Open or short in A/F sensor circuit
A/F sensor
Air induction system
Fuel pressure
Injector
ECM
WIRING DIAGRAM
Refer to DTC P0125 on page DI-43.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected. When troubleshooting, it is useful for determining
whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean
or rich, etc. at the time of the malfunction.
1 Are there any other codes (besides DTC P1133, P1153) being output?
YES Go to relevant DTC chart (See page DI-14).
NO
2 Connect OBDII scan tool or TOYOTA hand-held tester, and read value for volt-
age output of A/F sensor.
PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand-held tester to the DLC3.
(b) Warm up the A/F sensor with the engine speed at 2,500 rpm for approx. 90 sec.
CHECK:
Read the voltage of the A/F sensor on the screen of the OBD II scan tool or TOYOTA hand-held tester when
you perform all the following conditions.
DI2H8-03
Page 992 of 1897
- DIAGNOSTICSENGINE
DI-1 13
269 Author: Date:
2001 AVALON (RM808U)
5 Check air induction system (See page SF-1).
NG Repair or replace.
OK
6 Check fuel pressure (See page SF-6).
NG Check and repair fuel pump, pressure regulator,
fuel pipe line and filter (See page SF-1).
OK
7 Check injector injection (See page SF-23).
NG Replace injector.
OK
Replace A/F sensor.
8 Perform confirmation driving pattern (See page DI-106).
Go
9 Is there DTC P1133 or P1153 being output again?
YES Check and replace ECM (See page IN-30).
NO
Page 1005 of 1897
DI-126
- DIAGNOSTICSENGINE
282 Author: Date:
2001 AVALON (RM808U)
DTC P1346 VVT Sensor/Camshaft Position Sensor Cir-
cuit Range/Performance Problem (Bank 1)
DTC P1351 VVT Sensor/Camshaft Position Sensor Cir-
cuit Range/Performance Problem (Bank 2)
CIRCUIT DESCRIPTION
Refer to DTC P1345, P1350 on page DI-124.
DTC No.DTC Detection ConditionTrouble Area
P1346Deviation in crankshaft position sensor signal and VVT sensor
(bank 1) signal (2 trip detection logic)Mechanical system malfunction (Jumping teeth of timing belt,
blt t thd)
P1351Deviation in crankshaft position sensor signal and VVT sensor
(bank 2) signal (2 trip detection logic)belt stretched)
ECM
WIRING DIAGRAM
Refer to DTC P1345, P1350 on page DI-124.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected. When troubleshooting, it is useful for determining
whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean
or rich, etc. at the time of the malfunction.
1 Check valve timing (Check for loose and jumping teeth of timing belt) (See page
EM-15).
NG Adjust valve timing (Repair or replace timing
belt).
OK
Check and replace ECM (See page IN-30).
DI6TA-01