Page 1295 of 3115
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
DI-246
- DIAGNOSTICSENGINE
439 Author: Date:
MONITOR DESCRIPTION
A leak in the evaporative emission system prompts the ECM to set DTC P0442, P0455 or P0456.
The ECM checks for leaks in the system by introducing a high negative pressure (vacuum) from the intake
manifold by commanding the EVAP VSV open while the CCV (vent) is closed and the pressure switching
valve is open. After sufficient time has elapsed the fuel tank should have developed a high negative pressure
(vacuum) and the EVAP VSV closed. The ECM then monitors the pressure-rise (loss of vacuum) in the fuel
tank. If the pressure rises too rapidly, the ECM concludes that there is a leak in the system. The ECM will
turn on the MIL and set a DTC.
The ECM has separate DTCs for small and large leaks:
(1) DTC P0442 is set when the internal fuel tank pressure has a large increase and the EVAP system
has a small leak.
(2) DTC P0455 is set when the EVAP system has various large leaks. Even though the ECM sends
a signal to the EVAP VSV (when CCV is closed) to create a vacuum, the internal fuel tank pres-
sure does not decrease beyond a specified level.
(3) DTC P0456 is set when the internal fuel tank pressure increase slightly and the EVAP system
has a small leak.
Page 1296 of 3115
- 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
Page 1329 of 3115
DI-280
- DIAGNOSTICSENGINE
473 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the
engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help deter-
mine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean
or rich, as well as other data from the time when a malfunction occurred.
Hand-held tester:
1 Check operation of stop light.
CHECK:
Check if the stop lights come on and go off normally when the brake pedal is operated and released.
NG Check and repair stop light circuit.
OK
2 Check STOP fuse.
PREPARATION:
Remove the STOP fuse from the cowl side J/B LH.
CHECK:
Check the continuity of the STOP fuse.
OK:
Continuity
NG Check for short in all harness and components
connected to STOP fuse.
OK
3 Check stop light switch (See page BE-50).
NG Replace stop light switch.
OK
Page 1330 of 3115
A19642
Brake Pedal
DepressedBrake Pedal
Release ON
() ()
ST1-(+)E8
E7
E1 (-)
- DIAGNOSTICSENGINE
DI-281
474 Author: Date:
2004 LAND CRUISER (RM1071U)
4 Check STP signal and ST1- voltage.
PREPARATION:
(a) Turn the ignition switch ON.
(b) Select the item ºDIAGNOSIS / ENHANCED OBD II /
DATA LIST / ALL / STOP LIGHT SWº.
CHECK:
Read the signal displayed on the hand-held tester.
OK:
Brake PedalSpecified Condition
DepressedSTP Signal ON
ReleasedSTP Signal OFF
CHECK:
Measure the voltage between the specified terminals of the E7
and E8 ECM connectors.
OK:
Tester ConnectionBrake PedalSpecified Condition
ST1- (E8-12) - DepressedBelow 1.5 VST1 (E8 12)
E1 (E7-1)
Released7.5 to 14 V
OK Check for intermittent problems (See page
DI-3).
NG
Page 1331 of 3115
A56986
A67404A21228
Wire Harness Side:
Stop Light Switch Connector
ECM Connector S5
ST1-
STP
E8
DI-282
- DIAGNOSTICSENGINE
475 Author: Date:
2004 LAND CRUISER (RM1071U)
5 Check harness and connector between ECM and stop light switch.
PREPARATION:
(a) Disconnect the S5 stop light switch connector.
(b) Disconnect the E8 ECM connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Tester ConnectionSpecified Condition
Stop light switch (S5-1) - STP (E8-19)Below 1 W
Stop light switch (S5-4) - ST1- (E8-12)Below 1 W
Stop light switch (S5-1) or
STP (E8-19) - Body ground10 kW or higher
Stop light switch (S5-4) or
ST1- (E8-12) - Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Replace ECM (See page SF-60).
Page 1332 of 3115
- DIAGNOSTICSENGINE
DI-283
476 Author: Date:
2004 LAND CRUISER (RM1071U)
OBD II scan tool (excluding hand-held tester):
1 Check operation of stop light.
CHECK:
Check if the stop lights come on and go off normally when the brake pedal is operated and released.
NG Check and repair stop light circuit.
OK
2 Check STOP fuse.
PREPARATION:
Remove the STOP fuse from the cowl side J/B LH.
CHECK:
Check the continuity of the STOP fuse.
OK:
Continuity
NG Check for short in all harness and components
connected to STOP fuse.
OK
3 Check stop light switch (See page BE-50).
NG Replace stop light switch.
OK
Page 1334 of 3115
A56986
A67404A21228
Wire Harness Side:
Stop Light Switch Connector
ECM Connector S5
ST1-
STP
E8
- DIAGNOSTICSENGINE
DI-285
478 Author: Date:
2004 LAND CRUISER (RM1071U)
5 Check harness and connector between ECM and stop light switch.
PREPARATION:
(a) Disconnect the S5 stop light switch connector.
(b) Disconnect the E8 ECM connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Tester ConnectionSpecified Condition
Stop light switch (S5-1) - STP (E8-19)Below 1 W
Stop light switch (S5-4) - ST1- (E8-12)Below 1 W
Stop light switch (S5-1) or
STP (E8-19) - Body ground10 kW or higher
Stop light switch (S5-4) or
ST1- (E8-12) - Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Replace ECM (See page SF-60).
Page 1337 of 3115
DI-288
- DIAGNOSTICSENGINE
481 Author: Date:
2004 LAND CRUISER (RM1071U) Range check:
Missing output duty change
INSPECTION PROCEDURE
HINT:
When the throttle position is slightly opened (the accelerator pedal is slightly depressed) because a
floor carpet is overlapped on the accelerator pedal, or if not fully releasing the accelerator pedal, etc.,
DTC P0505 will possibly be detected.
Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records
the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can
help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel
ratio was lean or rich, as well as other data from the time when a malfunction occurred.
1 Are there any other codes (besides P0505) being output?
PREPARATION:
(a) Connect the hand-held tester or the OBD II scan tool to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tester or OBD II scan tool main switch ON.
(c) When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC
INFO / CURRENT CODES.
CHECK:
Read the DTC using the hand-held tester or the OBD II scan tool.
RESULT:
Display (DTC Output)Proceed to
P0505A
ºP0505º and other DTCsB
HINT:
If any other codes besides P0505 are output, perform the troubleshooting for those DTCs first.
B Go to relevant DTC chart (See page DI-36).
A
2 Check connection of PCV piping.
NG Repair or replace PCV piping.
OK
