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DI-696
DIAGNOSTICS - ENGINE (2UZ-FE)
DIDRQ-01
DTC P0455 Evaporative Emission Control System Leak
Detected (Gross Leak)
DTC P0456 Evaporative Emission Control System Leak
Detected (Very Small Leak)
DTC SUMMARY
Detection Detection
DTC Monitoring Items Malfunction Detection Conditions Trouble Areas
Timings Logic
Vacuum pump creates negative pressure
S Fuel tank cap (loose)
(vacuum) in EVAP system and EVAP sys-
S Leakage from EVAP line
tem pressure measured. 0.02 inch leak
(Canister - Fuel tank) While
pressure standard is measured at the start
S Leakage from EVAP line ignition
P0455 EVAP gross leak and at the end of the leak check. 2 trip
(Purge VSV - Canister) switch
If stabilized pressure higher than [second
S Pump module OFF
0.02 inch leak pressure standard x 0.2],
S Leakage from fuel tank
ECM determines that EVAP system has
S Leakage from canister
large leakage.
Vacuum pump creates negative pressure
(vacuum) in EVAP system and EVAP sys-
tem pressure measured. 0.02 inch leak While
pressure standard is measured at the start ignition
P0456 EVAP small leak Same above 2 trip
and at the end of the leak check. switch
If stabilized pressure larger than second OFF
0.02 inch leak pressure, ECM determines
that EVAP system has small leakage.
CIRCUIT DESCRIPTION
The circuit description can be found in the EVAP (Evaporative Emission) Inspection Procedure (see page
DI-884).
DI-697
DIAGNOSTICS - ENGINE (2UZ-FE)
MONITOR DESCRIPTION
5 hours* after the ignition switch is turned OFF, the electric vacuum pump creates negative pressure (vacu-
um) 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 ignition 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 ignition switch is
turned off, the monitor check starts 2.5 hours later.
Sequence Operations Descriptions Duration
- ECM activation Activated by soak timer, 5 hours (7 or 9.5 hours) after ignition switch turned to OFF. -
Vent valve turned OFF (vent) and EVAP system pressure measured by ECM in order to
Atmospheric pressure register atmospheric pressure.
A 10 seconds
measurement If EVAP pressure is not between 70 kPa and 110 kPa (525 mmHg and 825 mmHg), ECM
cancels EVAP system monitor.
First 0.02 inch leak In order to determine 0.02 inch leak pressure standard, vacuum pump creates negative pres-
B pressure measure- sure (vacuum) through 0.02 inch orifice and them ECM checks if vacuum pump and vent 60 seconds
ment valve operate normally.
Vent valve turned ON (closed) to shut EVAP system.
Negative pressure (vacuum) created in EVAP system, and EVAP system pressure then
EVAP system pres-
C measured. 15 minutes*
sure measurement
Write down the measured value as it will be used in the leak check.
If EVAP pressure does not stabilize within 15 minutes, ECM cancels EVAP system monitor.
Purge VSV opened and then EVAP system pressure measured by ECM.
D Purge VSV monitor 10 seconds
Large increase indicates normal.
Second 0.02 inch leak Leak check is performed after second 0.02 inch leak pressure standard is measured.
E pressure measure- If stabilized system pressure higher than second 0.02 inch leak pressure standard, ECM 60 seconds
ment determines that EVAP system leaking.
F Final check Atmospheric pressure measured and then monitoring result recorded by ECM. -
* If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.
Operation A: Atmospheric Pressure Measurement Operation B: 0.02 Inch Leak Pressure Measurement
Canister
Fuel Tank
Vent Valve: OFF (vent) OFF OFF (vent)
Purge VSV: OFF
0.02 Inch Orifice
Pressure Sensor
Air Filter ON
Vacuum Pump: OFF Pump Module
Operation C: EVAP Leak Check Operation D: Purge VSV monitor
OFF ON (closed) ON ON (closed)
Atmospheric
Pressure
Negative
Pressure
ON ON
B17399
DI-698
DIAGNOSTICS - ENGINE (2UZ-FE)
(a) P0455: EVAP (Evaporative Emission) gross leak
In operation C, the vacuum pump creates negative pressure (vacuum) in the EVAP system and the EVAP
system pressure is measured. If the stabilized system pressure is higher than [second 0.02 inch leak pres-
sure standard x 0.2] (near atmospheric pressure), the ECM determines that the EVAP system has a large
leakage, illuminates the MIL and sets the DTC (2 trip detection logic).
(b) P0456: EVAP very small leak
In operation C, the vacuum pump creates negative pressure (vacuum) in the EVAP system and the EVAP
system pressure is measured. If the stabilized system pressure is higher than second 0.02 inch leak pres-
sure standard, the ECM determines that the EVAP system has a small leakage, illuminates the MIL and sets
the DTC (2 trip detection logic).
EVAP Pressure when EVAP system Leaks:
Purge VSV ON ON: Open
OFF: Closed
Vent Valve ON ON: Closed
OFF: Vent
Vacuum Pump ON
EVAP Pressure P0455
Positive
Negative
P0456
Second 0.02 inch
Leak Pressure
First 0.02 inch Standard x 0.2
Leak Pressure
Standard
OK
Sequence A B C D E
10 60 10 60
Time sec sec
Within 15 minutes
sec
sec
A23486
MONITOR STRATEGY
P0455 Gross leak detected
Related DTCs
R l t d DTC
P0456 Very small leak (0.020 inch hole) detected
Required sensors/components Purge VSV, Pump module
Frequency of operation Once per driving cycles
Duration Within 15 min. (varies with amount of fuel in tank)
MIL operation 2 driving cycles
Sequence of operation None
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever these
See page DI-437
DTCs are not present
Atmospheric pressure 70 to 110 kPa (525 to 825 mmHg)
Battery voltage 10.5 V -
Vehicle speed - 2.5 mph (4 km/h)
Ignition switch OFF
DI-699
DIAGNOSTICS - ENGINE (2UZ-FE)
Time after key off 5 or 7 or 9.5 hours
EVAP pressure sensor malfunction
Not detected
(P0450, P0452, P0453)
EVAP canister purge valve Not operated by scan tool
EVAP canister vent valve Not operated by scan tool
EVAP leak detection pump Not operated by scan tool
Both of the following conditions 1 and 2
-
set before key off
1. Duration that vehicle has been driven 5 min. -
2. EVAP purge operation Performed
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