Lexus ES300 (2002 year). Manual — part 373
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DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
05-1 11
264
22
CHECK FUEL TANK OVER FILL CHECK VALVE
NG
REPLACE FUEL TANK OVER FILL CHECK
VALVE OR FUEL TANK
OK
REPAIR OR REPLACE CHARCOAL CANISTER ASSY
VSV for
CCV
VSV
for EVAP
ECM
Vapor Pressure Sensor
Fuel Tank Over
Fill Check Valve
Fuel Tank
Charcoal Canister
VSV for
Pressure
Switching Valve
A10145
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DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
265
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
P0450
EVAPORATIVE EMISSION CONTROL
SYSTEM PRESSURE SENSOR
MALFUNCTION
DTC
P0451
EVAPORATIVE EMISSION CONTROL
SYSTEM PRESSURE SENSOR
RANGE/PERFORMANCE
CIRCUIT DESCRIPTION
The vapor pressure sensor,
VSV for canister closed valve (CCV) and VSV for 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.
DTC P0450 or P0451 is recorded by the ECM when the vapor pressure sensor malfunction.
DTC No.
DTC Detecting Condition
Trouble Area
P0450
10 seconds or less after engine starting condition vapor pres-
sure sensor fixed value continues for fixed value or more: (2
trip detection logic)
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
VSV for pressure switching valve is OFF
(b) vavor pressure sensor value
opening pressure valve of
charcoal canister
Open or short in vapor pressure sensor circuit
Vapor pressure sensor
ECM
WIRING DIAGRAM
Refer to DTC P0440 on page
051MD-08
A53763
VC
E2
A53769
E2
PTNK
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DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
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266
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
INSPECTION PROCEDURE
HINT:
If DTC P0441, P0446, P0450 or P0451 is output after DTC P0440 or P0442, first trouble shoot DTC
P0441, P0446 P0450 or P0451. If no malfunction is detected, troubleshoot DTC P0440 or P0442 next.
Read freeze frame data using hand-held tester or OBD II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected. When troubleshooting, it is useful for deter-
mining 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
VSV for EVAP, charcoal canister and vapor pressure sensor.
1
INSPECT ECM
(a)
Turn the ignition switch ON.
(b)
Measure the voltage between terminals VC and E2 of the
ECM connector.
Voltage: 4.5 - 5.5 V
NG
CHECK AND REPLACE ECM
OK
2
INSPECT ECM
(a)
Remove the fuel tank cap.
(b)
Turn the ignition switch ON.
(c)
Measure the voltage between terminals PTNK of the
ECM E6 connector and E2 of the ECM E10 connector.
Voltage: 3.0 - 3.6 V
OK
CHECK AND REPLACE ECM
NG
3
CHECK HARNESS AND CONNECTOR(VAPOR PRESSURE SENSOR - ECM)
NG
REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE VAPOR PRESSURE SENSOR ASSY
From
Speed Sensor
Skid
Control
Computer
ASSY
4-Pulse
Combination
Meter
ECM
4-Pulse
A52996
A61591
Combination Meter
33
Passenger Side J/B
6
V - W
C7
W
3A
IK1
17
E7
SPD
5V
V - W
3A
82
92
ECM
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DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
267
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
P0500
VEHICLE SPEED SENSOR MALFUNCTION
CIRCUIT DESCRIPTION
The speed sensor for skid control computer assy detects the wheel speed amd sends the appropriate signals
to the skid control computer assy.
The ECM converts these signals into a 4-pulse signal and outputs it to the combination meter.
After this signal is converted into a more precise rectangular waveform by the waveform shaping circuit in-
side 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.
DTC Detecting Condition
Trouble Area
P0500
No vehicle speed sensor signal to Engine & ECT ECU under
the following conditions: (2 trip detection logic)
Vehicle is being driven
Clutch or brake slips or gear is broken (2-trip detection logoc)
Combination meter
Open or short in speed sensor circuit
Vehicle speed sensor
ECM
Skid control computer assy
WIRING DIAGRAM
055CI-04
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