1998 TOYOTA LAND CRUISER Charcoal
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- DIAGNOSTICSAUTOMATIC TRANSMISSION
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6. DEFINITION OF TERMS
TermDefinition
Monitor descriptionDescription of what the ECM monitors and how it detects malfunctions (monitoring purpose and its details).
Related DTCsDiagnostic code
Typical enabling condition
Preconditions that allow the ECM to detect malfunctions.
With all preconditions satisfied, the ECM sets the DTC when the monitored value(s) exceeds the malfunction
threshold(s).
Sequence of operation
The priority order that is applied to monitoring, if multiple sensors and components are used to detect the malfunc-
tion.
While another sensor is being monitored, the next sensor or component will not be monitored until the previous
monitoring has concluded.
Required sensor/compo-
nentsThe sensors and components that are used by the ECM to detect malfunctions.
Frequency of operation
The number of times that the ECM checks for malfunctions per driving cycle.
ºOnce per driving cycleº means that the ECM detects malfunction only one time during a single driving cycle.
ºContinuousº means that the ECM detects malfunction every time when enabling condition is met.
DurationThe minimum time that the ECM must sense a continuous deviation in the monitored value(s) before setting a
DTC. This timing begins after the ºtypical enabling conditionsº are met.
Malfunction thresholdsBeyond this value, the ECM will conclude that there is a malfunction and set a DTC.
MIL operation
MIL illumination timing after a defect is detected.
ºImmediatelyº means that the ECM illuminates MIL the instant the ECM determines that there is a malfunction.
º2 driving cycleº means that the ECM illuminates MIL if the same malfunction is detected again in the 2nd driving
cycle.
7. TOYOTA/LEXUS PART AND SYSTEM NAME LIST
This reference list indicates the part names used in this manual along with their definitions.
TOYOTA/LEXUS nameDefinition
Toyota HCAC system, Hydrocarbon adsorptive Catalyst
(HCAC) system, HC adsorptive three-way catalystHC adsorptive three-way catalytic converter
Variable Valve Timing sensor, VVT sensorCamshaft position sensor
Variable valve timing system, VVT systemCamshaft timing control system
Camshaft timing oil control valve, Oil control valve OCV,
VVT, VSVCamshaft timing oil control valve
Variable timing and lift, VVTLCamshaft timing and lift control
Crankshaft position sensor ºAºCrankshaft position sensor
Engine speed sensorCrankshaft position sensor
THAIntake air temperature
Knock control moduleEngine knock control module
Knock sensorEngine knock sensor
Mass or volume air flow circuitMass air flow sensor circuit
Vacuum sensorManifold air pressure sensor
Internal control module, Control module, Engine control
ECU, PCMPower train control module
FC idleDeceleration fuel cut
Idle air control valveIdle speed control
VSV for CCV, Canister close valve VSV for canister controlEvaporative emissions canister vent valve
VSV for EVAP, Vacuum switching valve assembly No. 1,
EVAP VAV, Purge VSVEvaporative emissions canister purge valve
VSV for pressure switching valve, Bypass VSVEvaporative emission pressure switching valve
Vapor pressure sensor, EVAP pressure sensor, Evaporative
emission control system pressure sensorFuel tank pressure sensor
Charcoal canisterEvaporative emissions canister
ORVR systemOn-boad refueling vapor recovery system
Intake manifold runner controlIntake manifold tuning system
Intake manifold runner valve, IMRV, IACV (runner valve)Intake manifold tuning valve
Intake control VSVIntake manifold tuning solenoid valve
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A19378A20057
ECM
EVAP VSV
Charcoal Canister
Fuel Tank Fig. 1
(2)
(3) (4) (6)
(8)
(9) (1)
(5)
(7)Vapor Pressure
Sensor
CCVPressure
Switching
Valve
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DTC P0441 Evaporative Emission Control System Incor-
rect Purge Flow
DTC P0446 Evaporative Emission Control System Vent
Control Circuit
DTC P2418 Evaporative Emission System Valve Control
Circuit/Open
CIRCUIT DESCRIPTION
The vapor pressure sensor, canister closed valve (CCV), and pressure switching valve are used to detect
abnormalities in the evaporative 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, P0446 and P2418 are recorded by the ECM when evaporative emissions leak from the compo-
nents within the dotted line in Fig. 1 below, or when there is a malfunction in either the EVAP VSV, the pres-
sure switching valve, or in the vapor pressure sensor itself.
DIC2H-01
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A21544
CCV
Pressure Switching Valve
EVAP VSV
Cold Start
ECT/IAT near same temp.Open
ClosedOpen ClosedOpen
Closed
Closed
Closed Open
P0441, P0446,
P0455, P2418
Negative Pressure
OccursP0442, P0456
Tank & Canister
Leak CheckP0446
Pressure Switching
Valve Testing
(ex. Fuel tank cap loose)
(ex. Disconnect of vacuum hose)
P2418
CCV
Testing
Pressure
Switching
valve open
malfunction
(P2418)
(P0455) Gross Leak
P0442
P0456
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DTC No.DTC Detecting ConditionTrouble Area
P0441
Pressure in charcoal canister and fuel tank does not drop dur-
ing purge control (2 trip detection logic)Vacuum hose cracks, holed, blocked, damaged or discon-
nected
((1), (2), (3), (4), (5), (6), (7), (8) and (9) in Fig. 1)P0441During purge cut-off, pressure is very low compared with at-
mospheric pressure (2 trip detection logic)
nected ((1), (2), (3), (4), (5), (6), (7), (8) and (9) in Fig. 1)
Fuel tank cap incorrectly installed
Fuel tank cap cracked or damaged
No fuel tank pressure rise when commanding the CCV open
after an EVAP leak test
g
Open or short in vapor pressure sensor circuit
Vapor pressure sensor
Open or short in VSV circuit for EVAPP0446A high negative pressure (vacuum) does not occurs in the
system when commanding the EVAP VSV open and CCV
closed with the pressure switching valve openOpen or short in VSV circuit for EVAP
EVAP VSV
Open or short in VSV circuit for CCV
CCV
No fuel tank pressure change when commanding the pressure
switching valve closed for the check after the EVAP leak test
CCV
Open or short in VSV circuit for pressure switching valve
Pressure switching valve
P2418A high negative pressure (vacuum) does not occurs in the
system when commanding the EVAP VSV open and CCV
closed with the pressure switching valve open
g
Fuel tank cracked, holed or damaged
Charcoal canister cracked, holed or damaged
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.
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A19812
VSV is ON
VSV is OFF
- DIAGNOSTICSENGINE
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4 Check filler neck for damage.
PREPARATION:
Remove the fuel tank cap.
CHECK:
Visually inspect the filler neck for damage.
NG Replace filler pipe.
OK
5 Check purge flow.
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Select the ºENHANCED OBD II / ACTIVE TESTº mode on
the hand-held tester.
(c) Disconnect the vacuum hose for the EVAP VSV from the
charcoal canister.
(d) Start the engine.
(e) Select the item ºEVAP (ALON) / ALLº in the ACTIVE TEST
and operate EVAP VSV.
CHECK:
When the EVAP VSV is operated by the hand-held tester,
check whether the disconnected hose applies suction to your
finger.
OK:
VSV is ON:
Disconnected hose applies suction to your finger.
VSV is OFF:
Disconnected hose applies no suction to your finger.
OK Go to step 9.
NG
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DI-230
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6 Check vacuum hose between intake manifold and EVAP VSV, and EVAP VSV and
charcoal 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, damage and blockage.
NG Repair or replace vacuum hose.
OK
7 Check operation of EVAP VSV (See page SF-44).
NG Replace EVAP VSV.
OK
8 Check for open and short in harness and connector between EFI or ECD relay
and EVAP VSV, and EVAP VSV and ECM (See page IN-36).
NG Repair or replace harness or connector.
OK
Replace ECM (See page SF-60).
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A10150A10149BE6653
A10281VSV is OFFVSV is ON ON
Air
FAir
E
F E
- DIAGNOSTICSENGINE
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9 Check CCV.
PREPARATION:
(a) Disconnect the vacuum hose for the CCV VSV from the
charcoal canister.
(b) Turn the ignition switch ON and push the hand-held tes-
ter main switch ON.
(c) Select the ºENHANCED OBD II / ACTIVE TESTº mode on
the hand-held tester.
(d) Select the item ºCAN CTRL VSV / ALLº in the ACTIVE
TEST and operate CCV.
CHECK:
Check the VSV operation when it is operated by the hand-held
tester.
OK:
VSV is ON:
Air does not flow from port E to port F.
VSV is OFF:
Air from port E flows out through port F.
OK Go to step 13.
NG
10 Check vacuum hose between CCV and charcoal 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 damage, and blockage.
NG Repair or replace vacuum hose.
OK
11 Check operation of CCV (See page SF-48).
NG Replace CCV.
OK
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A19522A19630
VC
E2(+)
(-) E5
ECM Connector
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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 the E5 ECM connector.
OK:
Tester ConnectionSpecified Condition
VC (E5-18) - E2 (E5-28)4.5 to 5.5 V
NG Replace ECM (See page SF-60).
OK
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23 Check fuel tank.
NG Replace fuel tank.
OK
24 Check charcoal canister for cranks, hole and damage.
NG Replace charcoal canister.
OK
Replace ECM (See page SF-60).