2000 TOYOTA CAMRY O2 sensor

A00472
ON
FE
G
FE
G
VSV is ON
VSV is OFF
DI±134
± DIAGNOSTICSENGINE (5S±FE)
369 Author: Date:
10 Check the VSV for vapor pressure sensor.
PREPARATION:
(a) Connect the 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) Select the ACTIVE TEST mode on the TOYOTA hand±
held tester.
CHECK:
Check the VSV operation when it is operated by TOYOTA
hand±held tester.
OK:
(1) VSV is ON:
Air from port E is flowing out through port F.
(2) VSV is OFF:
Air from port E is flowing out through port G.
OK Go to step 13.
NG
11 Check operation of VSV for vapor pressure sensor (See page SF±47).
OK Gp to step 12.
NG
Replace VSV charcoal canister, and then clean the vacuum hoses between charcoal canister and
VSV for vapor pressure sensor, and VSV for vapor pressure sensor and vapor pressure sensor.

A03018
A03280
A03421
VSV Connector for
PTNK (+)
E2 (±)
E2 (±) w/o Immobiliser
w/ Immobiliser
PTNK (+)
Vapor Pressure Sensor
± DIAGNOSTICSENGINE (5S±FE)
DI±135
370 Author: Date:
12 Check for open and short in harness and connector between EFI main relay
(Marking: EFI) and VSV for vapor pressure sensor, and VSV for vapor pressure
sensor and ECM (See page IN±31).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN±31).
13 When VSV connector for vapor pressure sensor is disconnected and VSV for
EVAP is ON, measure voltage between terminals PTNK and E2 of ECM connector.
PREPARATION:
(a) Remove the glove compartment (See page SF±64).
(b) Connect the TOYOTA hand±held tester to the DLC3.
(c) Disconnect the VSV connector for the vapor pressure
sensor.
(d) Select the ACTIVE TEST mode on the TOYOTA hand±
held tester.
(e) Start the engine.
CHECK:
Measure voltage between terminals PTNK and E2 of the ECM
connector using the TOYOTA hand±held tester when the VSV
for the EVAP is ON.
OK:
Voltage: 2.0 V or less
OK Go to step 15.
NG

A03018A03422
ON EngineStart
Stop
VSV for Vapor
Pressure
Sensor
OFFOFF
ON
VSV for
EVAP
5 sec. 5 sec.
PTNK
(+)E2
(±) w/o Immobiliser
w/ Immobiliser
PTNK (+) E2(±)
DI±136
± DIAGNOSTICSENGINE (5S±FE)
371 Author: Date:
14 Check vacuum hoses between charcoal canister and VSV for vapor pressure
sensor, and vapor pressure sensor and VSV for vapor pressure sensor.
CHECK:
(a) Check that the vacuum hose is connected correctly.
(b) Check the vacuum hose for looseness and disconnection.
(c) Check the vacuum hose for cracks, hole, damage and blockage.
NG Repair or replace.
OK
15 Check the charcoal canister.
PREPARATION:
(a) Remove the glove compartment (See page SF±64).
(b) Connect the TOYOTA hand±held tester to the DLC3.
(c) Remove the fuel tank cap.
(d) Disconnect the VSV connector for the vapor pressure
sensor.
(e) Select the ACTIVE TEST mode on the TOYOTA hand±
held tester.
(f) Start the engine.
(g) The VSV for the EVAP is ON by the TOYOTA hand±held
tester and remains on for 5 sec.
CHECK:
Measure voltage between terminals PTNK and E2 of the ECM
connector 5 sec. after switching the VSV for the EVAP from ON
to OFF.
OK:
Voltage: 2.5 V or less
NG Replace charcoal canister.
OK

± DIAGNOSTICSENGINE (5S±FE)
DI±137
372 Author: Date:
16 Remove charcoal canister and check it (See page EC±5)
NG Replace charcoal canister.
OK
17 Check fuel tank over fill check valve (See page EC±6).
NG Replace fuel tank over fill check valve or fuel
tank.
OK
Check and replace ECM (See page IN±31).
OBD II scan tool (excluding TOYOTA hand±held tester):
HINT:
If DTC P0441 (Evaporative Emission Control System Incorrect Purge Flow), P0446 (Evaporative Emission
Control System Vent Control Malfunction) or P0450 (Evaporative Emission Control System Pressure Sensor
Malfunction) is output after DTC P0440 (Evaporative Emission Control System Malfunction), first trouble-
shoot DTC P0441, P0446 or P0450. If no malfunction is detected, troubleshoot DTC P0440 next.
1 Check VSV connector for EVAP, VSV connector for vapor pressure sensor and
vapor pressure sensor connector for looseness and disconnection.
NG Repair or connect VSV or sensor connector.
OK

DI±138
± DIAGNOSTICSENGINE (5S±FE)
373 Author: Date:
2 Check vacuum hoses ((1), (4), (5), (6), (7), (8) and (9) on page DI±122).
CHECK:
(a) Check that the vacuum hose is connected correctly.
(b) Check the vacuum hose for looseness and disconnection.
(c) Check the vacuum hose for cracks, hole, damage and blockage.
NG Repair or replace.
OK
3 Check voltage between terminals VC and E2 of ECM connector
(See page DI±122, step 9).
NG Check and replace ECM (See page IN±31).
OK
4 Check voltage between terminals PTNK and E2 of ECM connector
(See page DI±122, step 10).
OK Go to step 6.
NG
5 Check for open and short in harness and connector between vapor pressure
sensor and ECM (See page IN±31).
NG Repair or replace harness or connector.
OK
Replace vapor pressure sensor.

A03020A03424
ON
OFF
ONTPC
E
G
FFE
G
VSV is ON
VSV is OFF OFFONTPC
w/o Immobiliser
w/ Immobiliser
DI±140
± DIAGNOSTICSENGINE (5S±FE)
375 Author: Date:
8 Check for open and short in harness and connector between EFI main relay
(Marking: EFI) and VSV for EVAP, and VSV for EVAP and ECM (See page IN±31)
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN±31).
9 Check VSV for vapor pressure sensor.
PREPARATION:
(a) Remove the glove compartment (See page SF±64).
(b) Turn the ignition switch ON.
CHECK:
(a) Connect between terminal TPC of the ECM connector
and body ground (ON).
(b) Disconnect between terminal TPC of the ECM connector
and body ground (OFF).
OK:
(1) VSV is ON:
Air from port E is flowing out through port F.
(2) VSV is OFF:
Air from port E is flowing out through port G.
OK Check and replace charcoal canister
(See page EC±6).
NG

± DIAGNOSTICSENGINE (5S±FE)
DI±141
376 Author: Date:
10 Check operation of VSV for vapor pressure sensor (See page SF±47).
NG Go to step 11.
OK
Replace VSV and clean vacuum hoses between charcoal canister and VSV for vapor pressure
sensor, and VSV for vapor pressure sensor and vapor pressure sensor, and then check the char-
coal canister.
11 Check for open and short in harness and connector between EFI main relay
(Marking: EFI) and VSV for vapor pressure sensor, and VSV for vapor pressure
sensor and ECM (See page IN±31).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN±31).
12 Check fuel tank over fill check valve (See page EC±6).
NG Replace fuel tank over fill check valve or fuel
tank.
OK
Check and replace charcoal canister
(See page EC±6).

A06551
VSV for
EVAP
Charcoal Canister
Fuel Tank ECM
Vapor Pressure
Sensor
VSV for Vapor
Pressure Sensor
Fuel Tank Over
Fill Check Valve
DI±142
± DIAGNOSTICSENGINE (5S±FE)
377 Author: Date:
DTC P0450 Evaporative Emission Control System
Pressure Sensor Malfunction
DTC P0451 Evaporative Emission Control System
Pressure Sensor Range/Performance
CIRCUIT DESCRIPTION
The vapor pressure sensor and VSV for vapor pressure sensor are used to detect abnormalities in the evap-
orative 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 is recorded by the ECM when the vapor pressure sensor malfunction.
DI1K0±04