Toyota Celica 2005 Repair Manual page 748

P0452 and P0453
Item
The monitor will run whenever these
DTCs are not present
Difference between intake air temperature
and engine coolant temperature at engine
start
Engine coolant temperature at engine
start
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 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−501.
INSPECTION PROCEDURE
HINT:
If different DTCs related to different systems that have terminal E2 as the ground terminal are output
S
simultaneously, terminal E2 may be open.
If DTC P0441 (Purge Flow), P0446 (CCV), P0451, P0452 or P0453 (Evaporative Pressure Sensor)
S
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
S
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
S
pressure sensor.
2005 CELICA (RM1131U)
DIAGNOSTICS − ENGINE (2ZZ−GE)
Minimum
−
10_C (50_F)
10_C (50_F)
747
Specification
See page DI−295
12_C (22_F)
35_C (95_F)
35_C (95_F)
Running
Threshold
7 times or more for 10 sec.
No change for 20 min. or more
Threshold
Less than −3.999 kPa (−30 mmHg)
1.999 kPa (15 mmHg) or more
DI−549
Maximum