Page 1318 of 3115
- DIAGNOSTICSENGINE
DI-269
462 Author: Date:
2004 LAND CRUISER (RM1071U)DTC No.
DTC Detecting ConditionTrouble Area
P0451
Vapor pressure sensor output extremely changes under condi-
tions of (a) and (b): (2 trip detection logic)
(a) Vehicle speed: 0 km/h (0mph), Engine speed: Idling and
pressure switching valve is OFF
(b) Vapor pressure sensor value opening pressure valve of
charcoal canister
Open or short in vapor pressure sensor circuit
P0452
10 seconds or less after engine starting condition vapor pres-
sure sensor fixed value continues for fixed value or less:
(2 trip detection logic)Vapor pressure sensor
ECM
P0453
10 seconds or less after engine starting condition vapor pres-
sure sensor fixed value continues for fixed value or more:
(2 trip detection logic)
MONITOR STRATEGY
P0451
Related DTCsP0451Evaporative emission control system pressure
sensor range/performance
Main sensors/componentsVapor pressure sensor
Required sensors/componentsRelated sensors/componentsMass air flow meter, Engine coolant temperature
sensor
Frequency of operationOnce per driving cycle
DurationSignal fluctuation (noise) monitoring: 10 sec.
No signal change (stuck) monitoring: 20 min.
MIL operation2 driving cycles
Sequence of operationNone
P0452 and P0453
RltdDTC
P0452Evaporative emission control system pressure
sensor/switch low input
Related DTCs
P0453Evaporative emission control system pressure
sensor/switch high input
Main sensors/componentsVapor pressure sensor
Required sensors/componentsRelated sensors/componentsMass air flow meter, Engine coolant temperature
sensor
Frequency of operationOnce per driving cycle
Duration17 sec.
MIL operation2 driving cycles
Sequence of operationNone
Page 1319 of 3115
DI-270
- DIAGNOSTICSENGINE
463 Author: Date:
2004 LAND CRUISER (RM1071U)
TYPICAL ENABLING CONDITIONS
P0451
ItSpecificationItemMinimumMaximum
The monitor will run whenever the follow-
ing DTCs are not presentSee ºList of disable a monitorº (on page DI-3)
Signal fluctuation (noise) monitoring:
Altitude-2,400 m (7,872 ft)
Difference between intake air temperature
and engine coolant temperature at engine
start
-7C (-12.6F)11.1C (20F)
Engine coolant temperature at engine
start4.4C (40F)35C (95F)
Intake coolant temperature at engine start4.4C (40F)35C (95F)
Vehicle stop and idling5 sec.15 sec.
Stuck monitoring:
Altitude-2,400 m (7,872 ft)
Vapor pressure sensorNo malfunction
Difference between intake air temperature
and engine coolant temperature at engine
start
-7C (-12.6F)11.1C (20F)
Engine coolant temperature at engine
start4.4C (40F)35C (95F)
Intake air coolant temperature at engine
start4.4C (40F)35C (95F)
Time after engine start5 sec.-
P0452 and P0453
ItSpecificationItemMinimumMaximum
The monitor will run whenever the follow-
ing DTCs are not presentSee ºList of disable a monitorº (on page DI-3)
Difference between intake air temperature
and engine coolant temperature at engine
start
-12C (21.6F)
Engine coolant temperature at engine
start10C (50F)35C (95F)
Intake air temperature at engine start10C (50F)35C (95F)
EngineRunning
Page 1320 of 3115
- DIAGNOSTICSENGINE
DI-271
464 Author: Date:
2004 LAND CRUISER (RM1071U)
TYPICAL MALFUNCTION THRESHOLDS
P0451
Detection CriteriaThreshold
Signal fluctuation (noise) monitoring:
The number of times the output changed 0.667 kPa (± 5
mmHg, ± 0.02 in.Hg) or more during 5 to 15 sec. after idling
and vehicle stop
5 times or more
No signal change (stuck) monitoring:
Fuel tank pressure ºno changeº time (less than 0.018 kPa
(0.135 mmHg, 0.005 in.Hg) change since engine start)10 min. or more
P0452 and P0453
Detection CriteriaThreshold
P0452:
Fuel tank pressureLess than -3.999 kPa (-30 mmHg, -1.18 in.Hg) / when engine running
P0453:
Fuel tank pressure1.999 kPa (15 mmHg, 0.59 in.Hg) or more / when engine running
WIRING DIAGRAM
Refer to DTC P0441, P0446 and P2418 on page DI-222.
INSPECTION PROCEDURE
HINT:
If different DTCs related to different system that have terminal E2 as the ground terminal are output
simultaneously, terminal E2 may be open.
If DTC P0441 (Purge Flow), P0446 (CCV), P0451, P0452 or P0453 (Evaporative Pressure Sensor)
is output with DTC P0442 or P0456, troubleshoot DTC P0441, P0446, P0451, P0452 or P0453 first.
If no malfunction is detected, troubleshoot DTC P0442 or P0456 next.
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, it is useful for determin-
ing whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio
was 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
vapor pressure sensor.
Page 1321 of 3115
A19522A19630
VC
E2(+)
(-) E5
ECM Connector
A19627A19432
A19637
E2PTNK
Vacuum Disconnect(+)
(-) E5
E9
DI-272
- DIAGNOSTICSENGINE
465 Author: Date:
2004 LAND CRUISER (RM1071U)
1 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
2 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.
(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.
(3) Check the vapor pressure sensor output waveform
using a hand-held tester.
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 to 3.7 V
(2) Voltage: 0.5 V or less
(3) A consecutive waveform presents.
OK Check for intermittent problems
(See page DI-3).
NG
Page 1322 of 3115
A21031
V1
Wire Harness Side:
Vapor Pressure SensorPTNK GND
VCC
A21032ECM Connector E5
E9
VC
E2
PTNK
- DIAGNOSTICSENGINE
DI-273
466 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Check for open and short in harness and connector between vapor pressure sen-
sor
and ECM.
PREPARATION:
(a) Disconnect the V1 vapor pressure sensor connector.
(b) Disconnect the E5 and E9 ECM connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Tester ConnectionSpecified Condition
PTNK (V1-2) - PTNK (E9-21)Below 1 W
GND (V1-1) - E2 (E5-28)Below 1 W
VCC (V1-3) - VC (E5-18)Below 1 W
PTNK (V1-2) or PTNK (E9-21) -
Body ground10 kW or higher
VCC (V1-3) or VC (E5-18) -
Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Replace vapor pressure sensor.
Page 1323 of 3115
P22487
Vehicle Speed
SensorCombination
MeterECM 4-pulse 4-pulse DI-274
- DIAGNOSTICSENGINE
467 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P0500 Vehicle Speed Sensor ºAº
DTC P0503 Vehicle Speed Sensor ºAº Intermittent/
Erratic/High
CIRCUIT DESCRIPTION
The No.1 vehicle speed sensor outputs a 4-pulse signal for every revolution of the rotor shaft, which is ro-
tated by the transmission output shaft via the driven gear. After this signal is converted into a more precise
rectangular waveform by the waveform shaping circuit inside the combination meter, it is then transmitted
to the ECM. The ECM determines the vehicle speed based on the frequency of these pulse signals.
DTC No.Proceed toDTC Detection ConditionTrouble Area
P0500Step 1
No vehicle speed sensor sig-
nal to ECM under following
conditions (a) and (b): (1 trip
detection logic)
(a) Park/neutral position
switch is OFF
(b) Vehicle is being driven
Combination meter
Open or short in vehicle speed sensor circuit
Vehicle speed sensor
ECM
P0503DI-3Intermittent problem in the ve-
hicle speed sensor circuit
MONITOR DESCRIPTION
The ECM assumes that the vehicle is driven when the park/neutral position switch is OFF and it has been
over 4 sec. since the actual vehicle speed was 9 km/h (6 mph) or more.
If there is no signal from the vehicle speed sensor with these conditions satisfied, the ECM concludes that
there is a fault in the vehicle speed sensor. The ECM will turn on the MIL and a DTC is set.
DI3CQ-13
Page 1324 of 3115
A21364
17 Cowl Side J/B LHECM
Combination Meter
SPD E8
2E 28
2Q70
16
C15J14
J/C
B B SB SB V
15
C15SB
From Vehicle Speed Sensor
- DIAGNOSTICSENGINE
DI-275
468 Author: Date:
2004 LAND CRUISER (RM1071U)
MONITOR STRATEGY
Related DTCsP0500Vehicle speed sensor ºAº pulse input error
Main sensorsVehicle speed sensor
Required sensors/componentsRelated sensorsPark/Neutral position switch, Engine coolant tem-
perature sensor, Combination meter
Frequency of operationContinuous
Duration500 output X 4 times
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever the follow-
ing DTCs are not presentSee ºList of disable a monitorº (on page DI-3)
Vehicle speed is 9 km/h (6 mph) or more4 sec.-
Park/neutral position switchOFF
Transfer neutral switchNot ºNº position
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Sensor signalNo pulse input
WIRING DIAGRAM
Page 1336 of 3115
- DIAGNOSTICSENGINE
DI-287
480 Author: Date:
2004 LAND CRUISER (RM1071U)
MONITOR STRATEGY
Related DTCsP0505Idle air control malfunction
Main sensors/componentsCrankshaft position sensor
Required sensors/componentsRelated sensors/componentsVehicle speed sensor, Engine coolant tempera-
ture sensor
Frequency of operationFunctional check: Once per trip
Range check: Continuous
DurationFunctional check: 10 min.
Range check: 10 sec.
MIL operationFunctional check: 2 driving cycles
Range check: Immediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever the follow-
ing DTCs are not presentSee ºList of disable a monitorº (on page DI-3)
Functional check:
Precondition is met when both of the fol-
lowing are metA and B
A. Intake air flow rate learnings is enabled3 sec.-
B. EngineRunning
Range check:
Output signal duty10%90%
Battery voltage10 V-
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Functional check:
Case 1:
All of the following conditions are met:A, B and C
A. Engine RPM - target engine RPM (History that vehicle
had run for 10 km/h (6.2 mph) or more)
Less than -100 rpm or more than 200 rpm
(A/C ON or park/neutral position switch ON)
or
Less than -100 rpm or more than 150 rpm
(A/C OFF and park/neutral position switch OFF)
B. Number of fall judgment5 times or more
C. Intake air control flow rate learning value
Value when fail is judged first + 3.31 L/sec. or more
or
Value when fail is judged first - 3.31 L/sec. or less
Case 2:
Both or the following condition are met:A and B
A. Engine RPM - target engine RPM (History that vehicle
had run for 10 km/h (6.2 mph) or more)
Less than -100 rpm or more than 200 rpm
(A/C ON or park/neutral position switch ON)
or
Less than -100 rpm or more than 150 rpm
(A/C OFF and park/neutral position switch OFF)
B. Intake air control flow rate learning value is for 5 sec.2.48 L/sec. or less or 11 L/sec. or more
