Toyota Celica 2005, Repair Manual

Page: 748 / 2497

− DIAGNOSTICS ENGINE (2ZZ − GE)
DI − 549
2005 CELICA (RM1131U)
P0452 and P0453
Item
Specification
Minimum Maximum
The monitor will run whenever these
DTCs are not present
See page DI − 295
Difference between intake air temperature
and engine coolant temperature at engine
start
− 12
_
C (22
_
F)
Engine coolant temperature at engine
start
10 _ C (50 _ F) 35 _ C (95 _ F)
Intake air temperature at engine start 10 _ C (50 _ F) 35 _ C (95 _ F)
Engine Running
TYPICAL MALFUNCTION THRESHOLDS
P0451
Detection Criteria Threshold
Fuel tank pressure sensor ”Noise” monitor:
Frequency that fuel tank pressure change is 0.667 kPa (5 mmHg) or
more
7 times or more for 10 sec.
Fuel tank pressure sensor ”Stuck” monitor:
Fuel tank pressure change No change for 20 min. or more
P0452 and P0453
Detection Criteria Threshold
P0452:
Fuel tank pressure Less than − 3.999 kPa ( − 30 mmHg)
P0453:
Fuel tank pressure 1.999 kPa (15 mmHg) or more
WIRING DIAGRAM
Refer to DTC P0441 on page DI − 501.
INSPECTION PROCEDURE
HINT:
S
If different DTCs related to different systems that have terminal E2 as the ground terminal are output
simultaneously, terminal E2 may be open.
S
If DTC P0441 (Purge Flow), P0446 (CCV), P0451, P0452 or P0453 (Evaporative Pressure Sensor)
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.
S
Read freeze frame data using
the hand−held tester or the OBD II scan tool
. Freeze frame data records
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.
S
If the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the vapor
pressure sensor.
747