Toyota 2GR-FE Manual page 438

ES–282
DTC
DTC
DTC SUMMARY
DTC No. Monitoring Item
ES
P0455 EVAP gross leak
P0456 EVAP small leak
DESCRIPTION
The circuit description can be found in the EVAP (Evaporative Emission) System (See page ES-400).
INSPECTION PROCEDURE
Refer to the EVAP System (See page ES-400).
MONITOR DESCRIPTION
5 hours* after the engine switch is turned off, the electric vacuum pump creates negative pressure
(vacuum) in the EVAP (Evaporative Emission) system. The ECM monitors for leaks and actuator
malfunctions based on the EVAP pressure.
HINT:
*: If the engine coolant temperature is not below 35°C (95°F) 5 hours after the engine switch is turned off,
the monitor check starts 2 hours later. If it is still not below 35°C (95°F) 7 hours after the engine switch is
turned off, the monitor check starts 2.5 hours later.
Sequence
- ECM activation
Atmospheric pressure
A
measurement
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
Evaporative Emission Control System Leak
P0455
Detected (Gross Leak)
Evaporative Emission Control System Leak
P0456
Detected (Very Small Leak)
Malfunction Detection
Condition
Vacuum pump creates negative
pressure (vacuum) in EVAP
system and EVAP system
pressure measured. 0.02 inch
leak pressure standard measured
at start and at end of leak check.
If stabilized pressure higher than
[second 0.02 inch leak pressure
standard x 0.2], ECM determines
that EVAP system has a large
leak
Vacuum pump creates negative
pressure (vacuum) in EVAP
system and EVAP system
pressure measured. 0.02 inch
leak pressure standard measured
at start and at end of leak check.
If stabilized pressure higher than
second 0.02 inch leak pressure
standard, ECM determines that
EVAP system has a small leak
Operation
Activated by soak timer, 5 hours (7 or 9.5 hours) after
engine switch turned off.
Vent valve turned OFF (vent) and EVAP system
pressure measured by ECM in order to register
atmospheric pressure.
If pressure in EVAP system not between 70 kPa and
110 kPa (525 mmHg and 825 mmHg), ECM cancels
EVAP system monitor.
Trouble Area
• Fuel tank cap (loose)
• Leakage from EVAP line
(Canister - Fuel tank)
• Leakage from EVAP line
(EVAP VSV - Canister)
• Pump module
• Leakage from fuel tank
• Leakage from canister
Same above
Description
Detection
Detection Timing
logic
While engine
2 trip
switch off
While engine
2 trip
switch off
Duration
-
10 seconds