1998 TOYOTA LAND CRUISER sensor

- DIAGNOSTICSENGINE
DI-247
440 Author
: Date
:
HINT:
Refer to DTCs P0441, P0446 and P2418
DTC No.DTC Detecting ConditionTrouble Area
P0442After the negative pressure introduction has been completed, if
the pressure in the EVAP system sharply increases.
After the negative pressure introduction has been completed, if
the pressure in the EVAP system sharply increases.

Hose or tube cracked, holed, damaged or loose seal ((3) in
Fig. 1)
Fl k i li lld
P0455If the vacuum is not strong enough, the ECM assumes the
EVAP system has a large hole.

Fuel tank cap incorrectly installed

Fuel tank cap cracked or damaged

Vacuum hose cracked, holed, blocked, damaged or discon-
nected ((1), (2), (4), (5), (6), (7), (8) and (9) in Fig. 1)


Fuel tank cracked, holed or damaged
P0456If the pressure in the EVAP system slightly increase while the
ECM performs a leak check.

Fuel tank cracked, holed or damaged

Charcoal canister cracked, holed or damaged

Open or short in vapor pressure sensor circuit

Vapor pressure sensor

ECM
HINT:
Typical DTC output of each trouble part
Trouble partTypical DTC output (*1)
Small LeakP0442 and/or P0456
Medium Leak (ex: Vacuum hose loose)P0455
Large Leak (ex: Fuel tank cap loose)P0441, P0446, P0455 and P2418
EVAP VSVOpen MalfunctionP0441EVAP VSVClose MalfunctionP0441, P0446, P0455 and P2418
CCVOpen MalfunctionP0441, P0446, P0455 and P2418CCVClose MalfunctionP0446
PSithiVlOpen MalfunctionP2418Pressure Switching ValveClose MalfunctionP0441, P0446, P0455 and P2418
*1: ECM may output some other DTC combination.
MONITOR STRATEGY
P0442Small leak (0.040 inch or more large hole) is de-
tected
Related DTCsP0455Gross leak detected
P0456Very small leak (0.020 inch hole) is detected
Main sensors/componentsVapor pressure sensor
Required sensors/componentsRelated sensors/components
Mass air flow sensor, Engine coolant temperature
sensor
EVAP VSV (purge VSV), CCV
Frequency of operationOnce per drive cycle
Duration60 sec.
MIL operation2 drive cycles
Sequence of operationNone

DI-248
- DIAGNOSTICSENGINE
441 Author
: Date
:
TYPICAL ENABLING CONDITIONS
ItCriteriaItemMinimumMaximum
The monitor will run whenever the follow-
ing DTCs are not presentSee ºList of disable a monitorº (on page DI-3)
Common pre-conditions for 0.020, 0.040 inch and gross:
Altitude-2,400 m (7,872 ft.)
Throttle position learningCompleted
Vapor pressure sensorNo malfunction
Difference between intake air temperature
and engine coolant temperature at engine
start
-7C (-13F)11.1C (20F)
Vehicle speed conditionA or B
A. Time after vehicle stopped
(Less than 10 km/h (6 mph))90 sec.-
B. Time after vehicle started
(7 km/h (4 mph) or more)20 sec.-
0.020 inch malfunction detection:
Engine coolant temperature at engine
start10C (50F)32C (89.6F)
Intake air temperature at engine start10C (50F)32C (89.6F)
Intake air temperature10°C (50°F)-
Fuel level condition in fuel tank during leak
checkFuel slosh is small (must not drive on road in bad conditions)
Time after engine start-50 min.
Fuel tank pressure condition before leak
check (Fuel tank condition before closed
negative pressure introduction)Tank inside pressure change is small before negative pressure introduction.
(Reference: If fuel in tank is high temperature, vapor volume increase and tank inside pressure
changes also increase)
Vehicle speed and intake air amount
condition before and after negative pres-
sure introduction
Steady speed and not change greatly of intake air amount
Fuel level-90%
0.020 inch leak detectionNot completed
0.040 inch leak detectionNot detected
CCV malfunction, bypass VSV malfunc-
tionNot detected
Vehicle speed-130 km/h (81 mph)
EVAP VSV (Evap purge VSV) malfunctionNot detected
0.040 inch and gross malfunction:
Engine coolant temperature at engine
start10°C (50°F)35°C (95°F)
Intake air temperature at engine start10°C (50°F)35°C (95°F)
Intake air temperature10°C (50°F)-
Fuel level condition in fuel tank during leak
checkFuel slosh is small (must not drive on road in bad conditions)
Time after engine start-50 min.
Fuel tank pressure condition before leak
check (Fuel tank condition before closed
negative pressure introduction)Tank inside pressure change is small before negative pressure introduction.
(Reference: If fuel in tank is high temperature, vapor volume increase and tank inside pressure
changes also increase)

A19522A19630
VC
E2(+)
(-) E5
ECM Connector
DI-256
- DIAGNOSTICSENGINE
449 Author
: Date
:
17 Check vacuum hoses between vapor pressure sensor and fuel tank, and char-
coal canister and pressure switching valve.
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 vacuum hose and tube.
OK
18 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 EC-2), 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 hose and tube.
OK
19 Check voltage between terminals VC and E2 of ECM connector.
CHECK:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals of the E5 ECM connec-
tor.
OK:
Tester ConnectionSpecified Condition
VC (E5-18) - E2 (E5-28)4.5 to 5.5 V
NG Replace ECM (See page SF-60).
OK

A19627A19432
A19637
E2PTNK
Vacuum Disconnect(+)
(-) E5
E9
- DIAGNOSTICSENGINE
DI-257
450 Author
: Date
:
20 Check voltage between terminals PTNK and E2 of ECM connectors.
PREPARATION:
(a) Remove the glove compartment door (See page
SF-60).
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals PTNK and E2 of the
ECM connectors at following condition (1) and (2).
(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:
Condition (1) Voltage: 2.9 to 3.7 V
Condition (2) Voltage: 0.5 V or less
OK Go to step 22.
NG
21 Check for open and short in harness and connector between vapor pressure
sensor and ECM (See page IN-36).
NG Repair or replace harness or connector.
OK
Replace ECM (See page SF-60).
22 Check fuel tank inlet valve.
NG Replace fuel tank inlet valve.
OK

A10193
A20058
DI-260
- DIAGNOSTICSENGINE
453 Author
: Date
:
5 Check whether hose close to fuel tank has 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 the fol-
lowing parts:

Fuel tank

Charcoal canister

Fuel tank filler pipe

Hoses and tubes around fuel tank and charcoal
canister
NG Repair or replace evaporative emission leak
part.
OK
6 Check vacuum hoses between vapor pressure sensor and fuel tank, charcoal
canister and pressure switching valve, and pressure switching valve and char-
coal canister.
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 vacuum hose.
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 EC-2), 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 hose and tube.
OK

- DIAGNOSTICSENGINE
DI-261
454 Author
: Date
:
8 Check vacuum hoses ((5), (6), (7), (8) and (9) in Fig. 1 in circuit description).
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 vacuum hose.
OK
9 Check VSV connector for EVAP, VSV connector for CCV, VSV connector for pres-
sure switching valve and vapor pressure sensor connector for looseness and
disconnection.
NG Repair or connect VSV or sensor connector.
OK
10 Check charcoal canister for cracks, hole and damage.
NG Replace charcoal canister.
OK

A19522A19630
VC
E2(+)
(-) E5
ECM Connector
A19627A19432
A19637
E2PTNK
Vacuum Disconnect(+)
(-) E5
E9
DI-262
- DIAGNOSTICSENGINE
455 Author
: Date
:
11 Check voltage between terminals VC and E2 of ECM connector.
CHECK:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals of the E5 ECM connec-
tor.
OK:
Tester ConnectionSpecified Condition
VC (E5-18) - E2 (E5-28)4.5 to 5.5 V
NG Replace ECM (See page SF-60).
OK
12 Check voltage between terminals PTNK and E2 of ECM connectors.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals PTNK and E2 of the
ECM connectors at following condition (1) and (2).
(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:
Condition (1) Voltage: 2.9 to 3.7 V
Condition (2) Voltage: 0.5 V or less
OK Go to step 14.
NG

DI-268
- DIAGNOSTICSENGINE
461 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC P0451 Evaporative Emission Control System Pres-
sure Sensor/Switch Range/Performance
DTC P0452 Evaporative Emission Control System Pres-
sure Sensor/Switch Low Input
DTC P0453 Evaporative Emission Control System Pres-
sure Sensor/Switch High Input
MONITOR DESCRIPTION
DTC ºP0451, P0452 or P0453º is recorded by the ECM when the vapor pressure sensor malfunctions.
P0451
The ECM sensor pressure in the fuel tank using the vapor pressure sensor. The ECM supplies the sensor
with a regulated 5 V reference voltage and the sensor returns a signal voltage between 0.5 V and 4.5 V ac-
cording to the pressure level in the fuel tank.
When the pressure in the fuel tank is low, the output voltage of the vapor pressure sensor is low. When it
is high, the output voltage is high.
For this DTC P0451, the ECM checks for a ºnoisyº sensor or a ºstuckº sensor.
The ECM checks for a ºnoisyº sensor by monitoring the fuel tank pressures when the vehicle is stationary
and there should be little variation in the tank pressure. If the indicated pressure varies beyond specified
limits, the ECM will illuminate the MIL (2-trip detection logic) and a DTC is set.
The ECM checks for a ºstuckº sensor by monitoring the fuel tank pressure for an extended time period. If
the indicated pressure does not change over this period, the ECM will conclude that the fuel tank pressure
sensor is malfunctioning, The ECM will illuminate the MIL and a DTC is set.
P0452 and P0453
The ECM sensor pressure in the fuel tank using the vapor pressure sensor. The ECM supplies the sensor
with a regulated 5 V reference voltage and the sensor returns a signal voltage between 0.5 V and 4.5 V ac-
cording to the pressure level in the fuel tank.
If the output voltage of the vapor pressure sensor is out of normal range, the ECM will determine that there
is a malfunction in the sensor or sensor circuit.
When pressure indicated by the vapor pressure sensor deviates below -3.999 kPa (-30 mmHg, -1.18 in.Hg)
or above 1.999 kPa (15 mmHg, 0.59 in.Hg), the ECM interprets this as a malfunction in the vapor pressure
sensor. The ECM will turn on the MIL and a DTC will be set.
DIC2J-01