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DI-687
DIAGNOSTICS - ENGINE (2UZ-FE)
DIDRP-01
DTC P0450 Evaporative Emission Control System Pres-
sure Sensor/Switch
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
DTC SUMMARY
Detection Tim- Detection
DTC Monitoring Items Malfunction Detection Conditions Trouble Areas
ings Logic
S Pump module S EVAP monitor-
Sensor output voltage rapidly fluctuates
Pressure sensor voltage ab- S Connector/Wire harness ing (ignition
P0450 beyond upper and lower malfunction 1 trip
normal fluctuation (Pump module - ECM) OFF)
thresholds for 0.5 seconds.
S ECM S Ignition ON
S Pump module S EVAP monitor-
Sensor output voltage fluctuates fre- S Connector/Wire harness ing (ignition
P0451 Pressure sensor noising 2 trip
quently in certain time period. (Pump module - ECM) OFF)
S ECM S Engine running
S Pump module
S EVAP monitor-
Sensor output voltage does vary in cer- S Connector/Wire harness
P0451 Pressure sensor stuck ing (ignition 2 trip
tain time period. (Pump module - ECM)
OFF)
S ECM
S Pump module S Ignition ON
Sensor output voltage is less than 0.45 S Connector/Wire harness S EVAP monitor-
P0452 Pressure sensor voltage low 1 trip
V for 0.5 seconds. (Pump module - ECM) ing (ignition
S ECM OFF)
S Pump module S Ignition ON
Sensor output voltage is more than 4.9 S Connector/Wire harness S EVAP monitor-
P0453 Pressure sensor voltage high 1 trip
V for 0.5 seconds. (Pump module - ECM) ing (ignition
S ECM OFF)
HINT:
The pressure sensor is built into the pump module.
CIRCUIT DESCRIPTION
The circuit description can be found in the EVAP (Evaporative Emission) Inspection Procedure (see page
DI-884).
DI-688
DIAGNOSTICS - ENGINE (2UZ-FE)
MONITOR DESCRIPTION
Pressure Sensor Specification: (a) DTC P0450: Pressure sensor voltage abnormal fluctua-
tion.
Malfunction Area
Output Voltage If the pressure sensor voltage output rapidly fluctuates
between less than 0.45 V and more than 4.9 V, the ECM
4.900 V
interprets this as an open or short circuit malfunction in
4.150 V the pressure sensor or its circuit, and stops the EVAP
(Evaporative Emission) system monitor. The ECM then il-
Usable Range
luminates the MIL and sets the DTC (1 trip detection log-
1.425 V
ic).
Malfunction Area
(b) DTC P0451: Pressure sensor noising or stuck
0.450 V
If the pressure sensor voltage output fluctuates rapidly for
60 110 Pressure
kPa kPa 10 seconds, the ECM stops the EVAP system monitor.
HINT: The ECM interprets this as noise from the pressure sen-
Standard atmospheric pressure is 101.3 kPa
B17403 sor, and stops the EVAP system monitor. The ECM then
illuminates the MIL and sets the DTC.
Alternatively, if the sensor voltage output does not
change for 10 seconds, the ECM interprets this as the
sensor being stuck, and stops the monitor. The ECM then
illuminates the MIL and sets the DTC.
(Both the malfunctions are detected by 2 trip detection
logic)
(c) DTC P0452: Pressure sensor voltage low
If the pressure sensor voltage output is below 0.45 V, the
ECM interprets this as an open or short circuit malfunction
in the pressure sensor or its circuit, and stops the EVAP
system monitor. The ECM then illuminates the MIL and
sets the DTC (1 trip detection logic).
(d) DTC P0453: Pressure sensor voltage high
If the pressure sensor voltage output is 4.9 V or more, the
ECM interprets this as an open or short circuit malfunction
in the pressure sensor or its circuit, and stops the EVAP
system monitor. The ECM then illuminates the MIL and
sets the DTC (1 trip detection logic).
DI-689
DIAGNOSTICS - ENGINE (2UZ-FE)
MONITOR STRATEGY
Evaporative emission control system pressure
P0450
sensor/switch chattering
Evaporative emission control system pressure
sensor noise
P0451
Evaporative emission control system pressure
Related DTCs
sensor stuck
Evaporative emission control system pressure
P0452
sensor/switch low input
Evaporative emission control system pressure
P0453
sensor/switch high input
Required sensors/components Pump module
Frequency of operation Once per driving cycle
0.5 sec.: P0450, P0452, P0453
Duration
15 sec.: P0451
Immediate: P0450, P0452, P0453
MIL operation
2 driving cycles: P0451
Sequence of operation None
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever these
See page DI-437
DTCs are not present
Pressure sensor noise:
Atmospheric pressure 70 to 110 kPa (525 to 825 mmHg)
Battery voltage 10.5 V -
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