Toyota 2GR-FE Manual page 432

ES–276
MONITOR DESCRIPTION
1. DTC P0450: Pressure sensor voltage abnormal fluctuation
If the pressure sensor output voltage rapidly fluctuates between less than 0.45 V and more than 4.9 V,
the ECM interprets this as an open or short circuit malfunction in the pressure sensor or its circuit, and
stops the EVAP (Evaporative Emission) system monitor. The ECM then illuminates the MIL and sets
the DTC (1 trip detection logic).
ES
2. DTC P0451: Pressure sensor noising or stuck
If the pressure sensor output voltage fluctuates rapidly for 10 seconds, the ECM stops the EVAP
system monitor. The ECM interprets this as noise from the pressure sensor, and stops the EVAP
system monitor. The ECM then illuminates the MIL and sets the DTC.
Alternatively, if the sensor output voltage 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).
3. DTC P0452: Pressure sensor voltage low
If the pressure sensor output voltage 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).
4. 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).
MONITOR STRATEGY
Related DTCs
Required Sensors/Components
Frequency of Operation
Duration
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
Pressure Sensor Specification:
Output Voltage
4.900 V
4.150 V
1.425 V
0.450 V
60
(450 ) (825)
HINT:
Standard atmospheric Pressure is
101.3 kPa
Malfunction Area
Usable Range
Malfunction Area
Pressure
110
kPa
(mmHg)
A140644E01
P0450: Pressure sensor chattering
P0451: Pressure sensor noise
P0451: Pressure sensor stuck
P0452: Pressure sensor low voltage
P0453: Pressure sensor high voltage
Pump module
Once per driving cycle: P0451 sensor stuck
Continuous: P0451 sensor noising, P0450, P0452 and P0453
0.5 seconds: P0450, P0452, P0453
Within 15 seconds: P0451