Toyota Celica 2005 Repair Manual page 449

DI−250
Intake air temperature at engine start
Engine
TYPICAL MALFUNCTION THRESHOLDS
P0451
Detection Criteria
Fuel tank pressure sensor "Noise" monitor:
Frequency that fuel tank pressure change is 0.667 kPa (5.0
mmHg) or more
Fuel tank pressure sensor "Stuck" monitor:
Fuel tank pressure change
P0452 and P0453
Detection Criteria
P0452:
Fuel tank pressure
P0453:
Fuel tank pressure
WIRING DIAGRAM
Refer to DTC P0441 on page DI−202.
INSPECTION PROCEDURE
HINT:
If different DTCs related to different systems that have terminal E2 as the ground terminal are output
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simultaneously, terminal E2 may be open.
If DTC P0441 (Purge Flow), P0446 (CCV) or P0451 (Evaporative Pressure Sensor) is output with DTC
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P0442 or P0456, troubleshoot DTC P0441, P0446 or P0451 first. If no malfunction is detected, trouble-
shoot DTC P0442 or P0456 next.
Read freeze frame data using the hand−held tester or the OBD II scan tool. Freeze frame data records
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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.
If the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the vapor
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pressure sensor.
2005 CELICA (RM1131U)
DIAGNOSTICS − ENGINE (1ZZ−FE)
10_C (50_F)
Less than −3.999 kPa (−30 mmHg, −1.18 in.Hg) when engine running
1.999 kPa (15 mmHg, 0.59 in.Hg) or more when engine running
448
35_C (95_F)
Running
Threshold
7 times or more for 10 sec.
No change for 20 min.
Threshold