2001 TOYOTA AVALON check engine

A00307
ON
VSV is ON VSV is OFF
Air Filter Air
Air
E
FE
F
BE6653
FI7073 FI7074
DI-146
- DIAGNOSTICSENGINE
302 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
TOYOTA hand-held tester:
1 Connect TOYOTA hand-held tester, and check operation of VSV for ACIS.
PREPARATION:
(a) Remove the fuse cover on the instrument panel.
(b) Connect the TOYOTA hand-held tester to the DLC3.
(c) Turn the ignition switch ON and TOYOTA hand-held tes-
ter main switch ON.
(d) Select the INTAKE CTRL VSV from the ACTIVE TEST
menu on the TOYOTA hand-held tester.
CHECK:
Check the operation of the VSV when the VSV is operated by
the TOYOTA hand-held tester.
OK:
VSV is ON:
Air from port E flows out through port F.
VSV is OFF:
Air from port E flows out through the air filter.
OK Check vacuum tank (See page SF-46).
NG
2 Check VSV for ACIS (See page SF-68).
NG Replace VSV for ACIS.
OK
3 Check for open and short in harness and connector between EFI main relay
(Marking: EFI) and ECM (See page IN-30).
NG Repair or replace harness or connector.
OK

A11824
ON
ACIS
(+)
(-)ACI1
- DIAGNOSTICSENGINE
DI-147
303 Author
: Date
:
2001 AVALON (RM808U)
Check and replace ECM (See page IN-30).
OBD II scan tool (excluding TOYOTA hand-held tester):
1 Check VSV for ACIS (See page SF-68).
NG Replace VSV for ACIS.
OK
2 Check voltage between terminals ACIS, ACI1 of ECM connector and body
ground.
PREPARATION:
(a) Remove the glove compartment (See page SF-82).
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals ACIS, ACI1 of the ECM
connector and body ground.
OK:
Voltage: 9 - 14 V
NG Check for open and short in harness and con-
nector between EFI main relay (Marking: EFI)
and ECM (See page IN-30).
OK
3 Check vacuum tank (See page SF-58).
NG Repair or replace.
OK
Check and replace ECM (See page IN-30).

A11668
Engine Room J/B
EFI No.1
2G
2B 2A
2F2
5
1 3
2B-W
4L-O
4 2
EFI No.2 EFI Relay
From BatteryB
Mass Air
Flow Meter3
2 1
EDW-B
R-BECM
E2GVG
E2 R10
19
E5E5
From
Terminal
MREL of
ECM
DI-24
- DIAGNOSTICSENGINE
180 Author
: Date
:
2001 AVALON (RM808U)
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.
1 Connect OBD II scan tool or TOYOTA hand-held tester, and read value of mass
air flow rate.
PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the OBD II scan tool or TOYOTA hand-held tester main switch
ON.
(c) Start the engine.
CHECK:
Read the mass air flow rate on the OBD II scan tool or TOYOTA hand-held tester.
RESULT:
Type IType II
Mass Air Flow Rate (gm/sec.)0.0271.0 or more
Type I Go to step 2.
Type II Go to step 5.

A00436
ON
4
BE6653
S05337
(+)
(-)
A02017
VG
(+)
(-)
- DIAGNOSTICSENGINE
DI-25
181 Author
: Date
:
2001 AVALON (RM808U)
2 Check voltage of mass air flow meter power source.
PREPARATION:
(a) Disconnect the mass air flow meter connector.
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal 4 of the mass air flow
meter connector and body ground.
OK:
Voltage: 9 - 14 V
NG Check for open in harness and connector be-
tween EFI main relay (Marking: EFI) and mass
air flow meter (See page IN-30).
OK
3 Check voltage between terminal VG of ECM connector and body ground.
PREPARATION:
(a) Remove the glove compartment (See page SF-82).
(b) Start the engine.
CHECK:
Measure the voltage between terminal VG of the ECM connec-
tor and body ground while the engine is idling.
OK:
Voltage:
1.1 - 1.5 V (P or N position and A/C switch OFF)
OK Check and replace ECM (See page IN-30).
NG
4 Check for open and short in harness and connector between mass air flow meter
and ECM (See page IN-30).
NG Repair or replace harness or connector.
OK

A02018
E2G
DI-26
- DIAGNOSTICSENGINE
182 Author
: Date
:
2001 AVALON (RM808U)
Replace mass air flow meter.
5 Check continuity between terminal E2G of ECM connector and body ground.
PREPARATION:
Remove the glove compartment (See page SF-82).
CHECK:
Check the continuity between terminal E2G of the ECM con-
nector and body ground.
OK:
Continuity (1 W or less)
NG Check and replace ECM (See page IN-30).
OK
6 Check for open in harness and connector between mass air flow meter and ECM
(See page IN-30).
NG Repair or replace harness or connector.
OK
Replace mass air flow meter.

A00310A09772
5 V
THA
E2
E1 22
18 4
5R Intake Air Temp. Sensor
(Built into Mass Air Flow Meter)ECM
L-B
W
E5 E5
- DIAGNOSTICSENGINE
DI-29
185 Author
: Date
:
2001 AVALON (RM808U)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:

If DTCs P0110, P0115, P0120 and P1410 are output simultaneously, E2 (sensor ground) may be open.

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 Connect OBD II scan tool or TOYOTA hand-held tester, and read value of intake
air temperature.
PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the OBD II scan tool or TOYOTA hand-held tester main switch
ON.
CHECK:
Read the temperature value on the OBD II scan tool or TOYOTA hand-held tester.
OK:
Same as actual intake air temperature.
HINT:

If there is open circuit, OBD II scan tool or TOYOTA hand-held tester indicates -40°C (-40°F).

If there is short circuit, OBD II scan tool or TOYOTA hand-held tester indicates 140°C (284°F) or more.
NG -40°C (-40°F) ... Go to step 2.
140°C (284°F) or more ... Go to step 4.
OK
Check for intermittent problems
(See page DI-3).

A00210
ON
Intake Air
Temp. Sensor
ECM
5 V
E2
THA22
18 1
2E5
E5
BE6653
FI7055
A02019
ON
Intake Air Temp. SensorECM
5 V
E2 22
18 E5
E5
E2
THA
THA
DI-30
- DIAGNOSTICSENGINE
186 Author
: Date
:
2001 AVALON (RM808U)
2 Check for open in harness or ECM.
PREPARATION:
(a) Disconnect the mass air flow meter connector.
(b) Connect the sensor wire harness terminals together.
(c) Turn the ignition switch ON.
CHECK:
Read the temperature value on the OBD II scan tool or TOYO-
TA hand-held tester.
OK:
Temperature value: 1405C (2845F) or more
OK Confirm good connection at sensor. If OK, re-
place mass air flow meter.
NG
3 Check for open in harness or ECM.
PREPARATION:
(a) Remove the glove compartment (See page SF-82).
(b) Connect between terminals THA and E2 of the ECM con-
nector.
HINT:
The mass air flow meter connector is disconnected. Before
checking, do a visual and contact pressure check for the ECM
connector (See page IN-30).
(c) Turn the ignition switch ON.
CHECK:
Read the temperature value on the OBD II scan tool or TOYO-
TA hand-held tester.
OK:
Temperature value: 1405C (2845F) or more
OK Open in harness between terminal E2 or THA,
repair or replace harness.
NG
Confirm good connection at ECM. If OK,
check and replace ECM (See page IN-30).

A00212
ON
Intake Air
Temp. Sensor
ECM
5 V
E2 22
18
THA
BE6653
FI7054E5
E5
A02043
ON
Intake Air Temp. Sensor
E5 ConnectorECM
5 V
E2 THA
- DIAGNOSTICSENGINE
DI-31
187 Author
: Date
:
2001 AVALON (RM808U)
4 Check for short in harness and ECM.
PREPARATION:
(a) Disconnect the mass air flow meter connector.
(b) Turn the ignition switch ON.
CHECK:
Read the temperature value on the OBD II scan tool or TOYO-
TA hand-held tester.
OK:
Temperature value: -405C (-405F)
OK Replace mass air flow meter.
NG
5 Check for short in harness or ECM.
PREPARATION:
(a) Remove the glove compartment (See page SF-82).
(b) Disconnect the E5 connector from the ECM.
HINT:
Mass air flow meter connector is disconnected.
(c) Turn the ignition switch ON.
CHECK:
Read the temperature value on the OBD II scan tool or TOYO-
TA hand-held tester.
OK:
Temperature value: -405C (-405F)
OK Repair or replace harness or connector.
NG
Check and replace ECM (See page IN-30).