fuel pressure TOYOTA CAMRY 1999 Service Repair Manual

A09421
E7
E51
9ECM
5 V
THCNG1
E2
E1 R
BR 3
4
BR Fuel Temperature
Sensor for Fuel Tank
BR IB1
IG2 LG±B
IB1IG2 LG±B LG±B 42
3 2
A09294BE6653
A09393
ON
THCNG1 E2
(±) (+)
± DIAGNOSTICSENGINE
DI±125
Fuel Temperature Sensor Circuit for Fuel Tank
CIRCUIT DESCRIPTION
A fuel temperature sensor that detects the temperature in the fuel tank is provided on the tank valve assem-
bly. A fuel pressure sensor that detects the pressure in the fuel main pipe is provided immediately upstream
of the fuel pressure regulator.
The pressure and the temperature of the fuel are detected by these sensors and are input into the ECM.
Those values are then converted by the ECM into the equipment pressure at 20°C (68°F) to actuate the
the fuel gauge.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check voltage between terminals THCNG1 and E2 of ECM connector.
PREPARATION:
(a) Remove the glove compartment (See Pub. No. RM654U,
page SF±64).
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals THCNG1 and E2 of
ECM connector.
Temperature°C (°F)Voltage V
±30 (22)0.56 ± 0.45
25 (77)3.39 ± 3.29
40 (104)4.0 ± 3.9
100 (212)4.85 ± 4.82
OK:
OK Check for intermittent problem
(See page DI±3).
DI652±01

DI±126
± DIAGNOSTICSENGINE
NG
2 Check fuel pressure sensor for fuel tank (See page SF±40).
NG Replace fuel pressure sensor for fuel tank.
OK
3 Check for open and short in harness and connector brtween ECM and fuel pres-
sure sensor for fuel tank (See page IN±29).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN±29).

EC03A±03
B06542
PCV Valve
VSV for EGR
Front TWC
(California)EGR Vacuum Modulator
EGR Valve
TWC (Except California)
Rear TWC (California)
VSV for EVAP
Vent Line
Charcoal Canister
Fuel Tank
EVAP Line
Air Drain Hose
Filler Pipe
Air Inlet LinePurge Line Cutoff Valve
Fill Check Valve
EVAP Service Port
Fuel Tank Cap
VSV for Vapor
Pressure Sensor Vapor Pressure Sensor
EC±2
± EMISSION CONTROL (5S±FE)PARTS LAYOUT AND SCHEMATIC DRAWING
1400 Author: Date:
PARTS LAYOUT AND SCHEMATIC DRAWING
LOCATION

EC03B±03
B06549
VSV for EGR Front TWC
(California)EGR Vacuum Modulator
EGR
Valve
TWC (Except California)
Rear TWC (California)VSV
for EVAP
Vent Line
Charcoal CanisterFuel Tank EVAP Line
Air Drain HoseFiller Pipe
Air Inlet Line Purge LineEVAP Service Port
Fuel Tank Cap
Vapor
Pressure
SensorVSV for Vapor
Pressure Sensor
± EMISSION CONTROL (5S±FE)PARTS LAYOUT AND SCHEMATIC DRAWING
EC±3
1401 Author: Date:
DRAWING

B06546
Pressure
Gauge
Pressure
B06547
Fuel Tank Cap
B01250
Air
Disconnect
EVAP Line Hose
B01251
Air
Disconnect
Cap
Disconnect
EVAP Line Hose
Purge Line Hose
Purge Port
EC±8
± EMISSION CONTROL (5S±FE)EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM
1406 Author: Date:
(2) Add the pressure (13.5 ± 15.5 in.Aq) from the EVAP
service port.
Pressure:
2 minutes after the pressure is added, the gauge
should be over 7.7 ± 8.8 in.Aq.
HINT:
If you can't add pressure, you can conclude that the hose con-
necting the VSV
canister
fuel tank has slipped off or the
VSV is open.
(3) Check if the pressure decreases when the fuel tank
cap is removed while adding pressure.
HINT:
If the pressure does not decrease when the filler cap is re-
moved, then you can conclude that the hose connecting the
service port to the fuel tank is blocked, etc.
(k) Disconnect the pressure gauge from the EVAP service
port on the purge line.
5. CHECK AIRTIGHTNESS IN FUEL TANK AND FILLER
PIPE
(a) Disconnect the EVAP line hose from the charcoal canister
side and then pressurize and make the internal pressure
in the fuel tank 4 kPa (41 gf/cm
2, 0.58 psi).
(b) Check that the internal pressure of the fuel tank can be
hold for 1 minute.
(c) Check the connected portions of each hose and pipe.
(d) Check the installed parts on the fuel tank.
If there is no abnormality, replace the fuel tank and filler pipe.
(e) Reconnect the EVAP line hose to the charcoal canister.
6. INSPECT FUEL CUTOFF VALVE AND FILL CHECK
VA LV E
(a) Disconnect the purge line hose and EVAP line hose from
the charcoal canister.
(b) Plug the cap to the air drain hose.
(c) Pressurize 4 kPa (41 gf/cm
2, 0.58 psi) to the purge port
and check that there is ventilation through the EVAP line
hose.

B01252
AirDisconnect
Air Inlet Line Hose
B01253
Pinch
Push
AA
Pinch
B01148
B01149
Air
Purge Port
Vent Port
Air Drain Port
Cap
EVAP
Port
± EMISSION CONTROL (5S±FE)EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM
EC±9
1407 Author: Date:
HINT:
In the condition that the fuel fuel is full, as the float value of the
fill check valve is closed and has no ventilation, it is necessary
to check the fuel amount (volume).
(d) Check if there is any struck in the vent line hose and EVAP
line hose.
If there is no stuck in hoses, replace the fuel cutoff valve and fill
check valve.
(e) Reconnect the purge line hose and EVAP line hose to the
charcoal canister.
7. CHECK AIR INLET LINE
(a) Disconnect the air inlet line hose from the charcoal canis-
ter.
(b) Check that there is ventilation in the air inlet line.
(c) Reconnect the air inlet line hose to the charcoal canister.
8. REMOVE CHARCOAL CANISTER ASSEMBLY
(a) Disconnect the VSV connector.
(b) Disconnect the vapor pressure sensor connector.
(c) Disconnect the purge line hose, EVAP line hose and air
inlet line hose from the charcoal canister.
(d) Disconnect the vent line hose from the charcoal canister.
(1) Push the connector deep inside.
(2) Pinch portion A.
(3) Pull out the connector.
(e) Remove the 2 charcoal canister mounting bolts.
(f) Remove the vapor pressure sensor mounting bolt.
(g) Remove the charcoal canister assembly.
9. INSPECT CHARCOAL CANISTER
(a) Visually check the charcoal canister for cracks or dam-
age.
(b) Inspect the charcoal canister operation.
(1) Plug the vent port with a cap.
(2) While holding the purge port closed, blow air (1.76
kPa, 18 gf/cm
2, 0.26 psi) into the EVAP port and
check that air flows from the air drain port.

EC01V±03
B06386
VSV for EGREGR Valve
Vent LineCharcoal Canister
Fuel Tank
EVAP Line
Air Drain Hose
Filler Pipe
Air Inlet Line
Purge Line
Cut Off Valve
Fill Check Valve
VSV for EVAP
VCVVacuum Surge Tank
EVAP Service Port
Vapor Pressure Sensor
Fuel Tank Cap
VSV for Vapor Pressure Sensor
Vacuum Surge Tank EC±2
± EMISSION CONTROL (1MZ±FE)PARTS LAYOUT AND SCHEMATIC DRAWING
1417 Author: Date:
PARTS LAYOUT AND SCHEMATIC DRAWING
LOCATION

EC01W±03
B06721
VSV for Vapor
Pressure Sensor Vapor Pressure
SensorVacuum Surge
Tank
EGR Valve
Position
Sensor
A/F Sensor
(California A/T)
Heated Oxygen Sensor
(Bank 2 Sensor 1/
Except California A/T)
A/F Sensor
(California A/T)
Heated Oxygen
Sensor
(Bank 1 Sensor 1/
Except California A/T)
Heated Oxygen
Sensor
(Bank 1 Sensor 2) VCV
TWC VSV for EVAP
Fuel Tank
Charcoal
CanisterVSV for EGR
WU±TWC
(California A/T)
EVAP Service Port
Purge Line
Air Inlet Line
Air Drain Hose
WU±TWC
(California A/T)
EVAP Line
Vent Line
± EMISSION CONTROL (1MZ±FE)PARTS LAYOUT AND SCHEMATIC DRAWING
EC±3
1418 Author: Date:
DRAWING

B06546
Pressure
Gauge
Pressure
B06547
Fuel Tank Cap
B01250
Air
Disconnect
EVAP Line Hose
B01251
Air
Disconnect
Cap
Disconnect
EVAP Line Hose
Purge Line Hose
Purge Port
EC±8
± EMISSION CONTROL (1MZ±FE)EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM
1423 Author: Date:
(2) Add the pressure (13.5 ± 15.5 in.Aq) from the EVAP
service port.
Pressure:
2 minutes after the pressure is added, the gauge
should be over 7.7 ± 8.8 in.Aq.
HINT:
If you can't add pressure, you can conclude that the hose con-
necting the VSV
canister
fuel tank has slipped off or the
VSV is open.
(3) Check if the pressure decreases when the fuel tank
cap is removed while adding pressure.
HINT:
If the pressure does not decrease when the filler cap is re-
moved, then you can conclude that the hose connecting the
service port to the fuel tank is blocked, etc.
(k) Disconnect the pressure gauge from the EVAP service
port on the purge line.
5. CHECK AIRTIGHTNESS IN FUEL TANK AND FILLER
PIPE
(a) Disconnect the EVAP line hose from the charcoal canister
side and then pressurize and make the internal pressure
in the fuel tank 4 kPa (41 gf/cm
2, 0.58 psi).
(b) Check that the internal pressure of the fuel tank can be
hold for 1 minute.
(c) Check the connected portions of each hose and pipe.
(d) Check the installed parts on the fuel tank.
If there is no abnormality, replace the fuel tank and filler pipe.
(e) Reconnect the EVAP line hose to the charcoal canister.
6. INSPECT FUEL CUTOFF VALVE AND FILL CHECK
VA LV E
(a) Disconnect the purge line hose and EVAP line hose from
the charcoal canister.
(b) Plug the cap to the air drain hose.
(c) Pressurize 4 kPa (41 gf/cm
2, 0.58 psi) to the purge port
and check that there is ventilation through the EVAP line
hose.

B01252
AirDisconnect
Air Inlet Line Hose
B01253
Pinch
Push
AA
Pinch
B01148
B01149
Air
Purge Port
Vent Port
Air Drain Port
Cap
EVAP
Port
± EMISSION CONTROL (1MZ±FE)EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM
EC±9
1424 Author: Date:
HINT:
In the condition that the fuel fuel is full, as the float value of the
fill check valve is closed and has no ventilation, it is necessary
to check the fuel amount (volume).
(d) Check if there is any struck in the vent line hose and EVAP
line hose.
If there is no stuck in hoses, replace the fuel cutoff valve and fill
check valve.
(e) Reconnect the purge line hose and EVAP line hose to the
charcoal canister.
7. CHECK AIR INLET LINE
(a) Disconnect the air inlet line hose from the charcoal canis-
ter.
(b) Check that there is ventilation in the air inlet line.
(c) Reconnect the air inlet line hose to the charcoal canister.
8. REMOVE CHARCOAL CANISTER ASSEMBLY
(a) Disconnect the VSV connector.
(b) Disconnect the vapor pressure sensor connector.
(c) Disconnect the purge line hose, EVAP line hose and air
inlet line hose from the charcoal canister.
(d) Disconnect the vent line hose from the charcoal canister.
(1) Push the connector deep inside.
(2) Pinch portion A.
(3) Pull out the connector.
(e) Remove the 2 charcoal canister mounting bolts.
(f) Remove the vapor pressure sensor mounting bolt.
(g) Remove the charcoal canister assembly.
9. INSPECT CHARCOAL CANISTER
(a) Visually check the charcoal canister for cracks or dam-
age.
(b) Inspect the charcoal canister operation.
(1) Plug the vent port with a cap.
(2) While holding the purge port closed, blow air (1.76
kPa, 18 gf/cm
2, 0.26 psi) into the EVAP port and
check that air flows from the air drain port.