TOYOTA CAMRY 1999 Service Repair Manual

A00479
Engine Speed
3,000 rpm
2,000 rpm
Idling
IG SW OFF(a)
Warmed up3 min. or so
2 sec. 2 sec.
CheckTime (b)(c)
(d)
± DIAGNOSTICSENGINE (1MZ±FE)
DI±309
544 Author: Date:
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 accessories switched OFF until water temp. 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 warmed up or not, the air±fuel ratio 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.
NO
2 Check gas leakage on exhaust system.
NG Repair or replace.
OK

DI±310
± DIAGNOSTICSENGINE (1MZ±FE)
545 Author: Date:
3 Check A/F sensors (bank 1, 2 sensor 1) (See page DI±255).
NG Repair or replace.
OK
4 Check heated oxygen sensor (bank 1 sensor 2) (See page DI±265).
NG Repair or replace.
OK
Replace three±way catalytic converter.

A01652
ECM
Vapor Pressure
Sensor
VSV for Vapor
Pressure Sensor VSV
for EVAP
Charcoal Canister
Fuel Tank (1)
(2)
(3) fig. 1
(6)
(4)
(5) (7)
Fuel Tank Over Fill
Check Valve
(8)
(9)
± DIAGNOSTICSENGINE (1MZ±FE)
DI±311
546 Author: Date:
DTC P0440 Evaporative Emission Control System
Malfunction
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 P0440 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
P0440Fuel tank pressure is atmospheric pressure after vehicle is
driven for 20 min. (2 trip detection logic)

Vapor pressure sensor

Fuel tank cap incorrectly installed

Fuel tank cap cracked or damaged

Vacuum hose cracked, holed, blocked, damaged or
disconnected ((1) or (2) in fig. 1)

Hose or tube cracked, holed, damaged or loose seal
((3) in fig. 1)

Fuel tank cracked, holed or damaged

Charcoal canister cracked, holed or damaged

Fuel tank over fill check valve cracked or damaged
DI4DT±01

A07447
Vapor Pressure Sensor
2J2
9J23
B±Y
V
VSV for EVAP
LG
AA
2
1ECM
5V
VC
PTNK
E1
E2
EVP1
E01
E01
TPC
3
2
Engine Rom J/B
MREL VSV for Vapor
Pressure Sensor
II3
EB
B±W
W±BL±R Y
1BRE10
E7
E10
E72
17
18
7
9
E78
EFI Relay
IA1 L±RY Y
ID1 II13
5
1
II1 BR
BR
ID1 E10
B±Y
J28 J27
B
ID1 10
1
2
ID12 2A
7 1
2C5
2K 53
2
1 EFI
B±WFL MAIN
From
24
B+
J28E B±YB
B±Y
B±Y
V
J35
J35C
C Junction
Connector
Junction
ConnectorJunction
Connector DI±312
± DIAGNOSTICSENGINE (1MZ±FE)
547 Author: Date:
WIRING DIAGRAM
INSPECTION PROCEDURE

If DTCs P0441, P0446, P0450 or P0451 is output after DTC P0440, first troubleshoot DTCs P0441,
P0446, P0450 or P0451. If no malfunction is detected, troubleshoot DTC P0440 next.

Ask the customer whether, after the MIL came on, the customer found the fuel tank cap loose and tight-
ened it. Also ask the customer whether the fuel tank cap was loose when refuelling. If the fuel tank cap
was not loose, it was the cause of the DTC. If the fuel tank cap was not loose or if the customer was
not sure if it was loose, troubleshoot according to the following procedure.

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 warmed up or not, the air±fuel
ratio lean or rich, etc. at the time of the malfunction.

When the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the
VSV for EVAP, charcoal canister and vapor pressure sensor.

A01653
± DIAGNOSTICSENGINE (1MZ±FE)
DI±313
548 Author: Date:
1 Check whether hose close to fuel tank have been modified, and check whether
there are signs of any accident near fuel tank or charcoal canister.
CHECK:
Check for cracks, deformation and loose connection of these
parts:

Fuel tank

Charcoal canister

Fuel tank filler pipe

Hoses and tubes around fuel tank and charcoal
canister
NG Repair or replace.
OK
2 Check that fuel tank cap is TOYOTA genuine parts.
NG Replace to TOYOTA genuine parts.
OK
3 Check that fuel tank cap is correctly installed.
NG Correctly install fuel tank cap.
OK
4 Check fuel tank cap (See page EC±6).
NG Replace fuel tank cap.
OK

DI±314
± DIAGNOSTICSENGINE (1MZ±FE)
549 Author: Date:
5 Check filler neck for damage.
PREPARATION:
Remove the fuel tank cap.
CHECK:
Visually inspect the filler neck for damage.
NG Replace filler pipe.
OK
6 Check vacuum hoses between vapor pressure sensor and VSV for vapor
pressure sensor, and VSV for vapor pressure sensor and charcoal canister
(See page EC±3 , SF±62 and EC±6).
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 and damage.
NG Repair or replace.
OK
7 Check hose and tube between fuel tank and charcoal canister.
CHECK:
(a) Check for proper connection of the fuel tank and fuel evap pipe (See page SF±1), fuel evap pipe and
fuel tube under the floor, fuel tube under the floor and charcoal canister.
(b) Check the hose and tube for cracks, hole and damage.
NG Repair or replace.
OK

A02022
ON
VC (+) E2 (±)
± DIAGNOSTICSENGINE (1MZ±FE)
DI±315
550 Author: Date:
8 Check charcoal canister for cracks, hole and damage (See page EC±6).
NG Replace charcoal canister.
OK
9 Check voltage between terminals VC and E2 of ECM connector.
CHECK:
(a) Remove the glove compartment (See page SF±73).
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals VC and E2 of the ECM
connector.
OK:
Voltage: 4.5 ~ 5.5 V
NG Check and replace ECM (See page IN±31).
OK

A02025
ON
E2 (±) PTNK (+)
Vacuum (1) (2)
DI±316
± DIAGNOSTICSENGINE (1MZ±FE)
551 Author: Date:
10 Check voltage between terminals PTNK and E2 of ECM connectors.
PREPARATION:
(a) Remove the glove compartment (See page SF±73).
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals PTNK and E2 of the ECM
connectors.
(1) Disconnect the vacuum hose from the vapor pres-
sure sensor.
(2) Using the MITYVAC (Hand±Held Vacuum Pump),
apply a vacuum of 4.0 kPa (30 mmHg, 1.18 in.Hg)
to the vapor pressure sensor.
NOTICE:
The vacuum applied to the vapor pressure sensor must be
less than 66.7 kPa (500 mmHg, 19.7 in.Hg).
OK:
(1) Voltage: 2.9 ~ 3.7 V
(2) Voltage: 0.5 V or less
OK Go to step 12.
NG
11 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.

± DIAGNOSTICSENGINE (1MZ±FE)
DI±317
552 Author: Date:
12 Check fuell tank and fuel tank over fill check valve for cracks and damage.
(See page EC±2)
NG Replace fuel tank or fuel tank over fill check
valve.
OK
It is likely that vehicle user did not properly close fuel tank cap.
Please explain to customer how to properly install fuel tank cap.

A01654
ECM
Vapor Pressure
Sensor
VSV for Vapor
Pressure Sensor
Fuel Tank Charcoal Canister VSV
for EVAP(1)
(2)
(3) (4)
(5) fig. 1
(6)
(7)
(8)
(9)Fuel Tank Over
Fill Check Valve DI±318
± DIAGNOSTICSENGINE (1MZ±FE)
553 Author: Date:
DTC P0441 Evaporative Emission Control System
Incorrect Purge Flow
DTC P0446 Evaporative Emission Control System Vent
Control Malfunction
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.
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
vapor pressure sensor, or in the vapor pressure sensor itself.

DI080±07