Toyota FJ Cruiser (GSJ 10, 15 series). Instruction — part 72
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES–243
ES
HINT:
If no pending DTCs are displayed on the tester, the
repair has been successfully completed.
NEXT
COMPLETED
ES–244
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
DTC SUMMARY
DESCRIPTION
The description can be found in the EVAP (Evaporative Emission) System (See page
).
INSPECTION PROCEDURE
Refer to the EVAP System (See page
MONITOR DESCRIPTION
5 hours
*
after the ignition switch is turned to OFF, the leak detection pump creates negative pressure
(vacuum) in the EVAP 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 to
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 to OFF, the monitor check starts 2.5 hours later.
DTC
P0455
Evaporative Emission Control System Leak
Detected (Gross Leak)
DTC
P0456
Evaporative Emission Control System Leak
Detected (Very Small Leak)
DTCs
Monitoring Items
Malfunction Detection Conditions
Trouble Areas
Detection
Timings
Detection
Logic
P0455
EVAP gross leak
Leak detection pump creates negative
pressure (vacuum) in EVAP system and
EVAP system pressure measured.
Reference pressure measured at start
and at end of leak check.
If stabilized pressure higher than [second
reference pressure x 0.2], ECM
determines that EVAP system has large
leak.
•
Fuel cap (loose)
•
Leakage from EVAP line
(Canister - Fuel tank)
•
Leakage from EVAP line
(Purge VSV - Canister)
•
Canister pump module
•
Leakage from fuel tank
•
Leakage from canister
While ignition
switch OFF
2 trip
P0456
EVAP small leak
Leak detection pump creates negative
pressure (vacuum) in EVAP system and
EVAP system pressure measured.
Reference pressure measured at start
and at end of leak check.
If stabilized pressure higher than second
reference pressure, ECM determines
that EVAP system has small leak.
•
Fuel cap (loose)
•
Leakage from EVAP line
(Canister - Fuel tank)
•
Leakage from EVAP line
(Purge VSV - Canister)
•
Canister pump module
•
Leakage from fuel tank
•
Leakage from canister
While ignition
switch OFF
2 trip
Sequ
ence
Operations
Descriptions
Duration
-
ECM activation
Activated by soak timer, 5 hours (7 or 9.5 hours) after ignition switch turned to OFF.
-
A
Atmospheric pressure
measurement
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-a and 110 kPa-a (525 mmHg-a and 825
mmHg-a), ECM cancels EVAP system monitor.
10 seconds
B
First reference
pressure measurement
In order to determine reference pressure, leak detection pump creates negative pressure
(vacuum) through reference orifice and then ECM checks if leak detection pump and vent
valve operate normally.
60 seconds
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES–245
ES
*
If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.
(a) P0455: EVAP gross leak
In operation C, the leak detection 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 reference
pressure 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).
C
EVAP system pressure
measurement
Vent valve turned ON (closed) to shut EVAP system.
Negative pressure (vacuum) created in EVAP system, and EVAP system pressure then
measured.
Write down measured value as will be used in leak check.
If EVAP pressure does not stabilize within 15 minutes, ECM cancels EVAP system monitor.
15 minutes
*
D
Purge VSV monitor
Purge VSV opened and then EVAP system pressure measured by ECM.
Large increase indicates normality.
10 seconds
E
Second reference
pressure measurement
After second reference pressure measurement, leak check performed by comparing first and
second reference pressure.
If stabilized system pressure higher than second reference pressure, ECM determines that
EVAP system leaking.
60 seconds
F
Final check
Atmospheric pressure measured and then monitoring result recorded by ECM.
-
Sequ
ence
Operations
Descriptions
Duration
Operation A: Atmospheric Pressure Measurement
Operation C: EVAP System Pressure Measurement
Operation B, E:
Reference Pressure Measurement
Operation D: Purge VSV Monitor
Purge VSV: OFF
Canister
Fuel Tank
Vent Valve: OFF (vent)
Canister Pump Module
Canister Filter
Canister
Pressure
Sensor
Leak Detection Pump: OFF
OFF
ON
ON (closed)
Atmospheric
Pressure
Negative
Pressure
OFF
OFF (vent)
ON
Reference Orifice (0.02 Inch)
ON
ON
ON (closed)
A112612E01
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1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
(b) P0456: EVAP very small leak
In operation C, the leak detection pump creates negative pressure (vacuum) in the EVAP system and the
EVAP system pressure is measured. If the stabilized system pressure is higher than the second reference
pressure, the ECM determines that the EVAP system has a small leakage, illuminates the MIL and sets
the DTC (2 trip detection logic).
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
Required Sensors/Components
Purge VSV and canister pump module
Frequency of Operation
Once per driving cycle
Duration
Within 15 minutes (varies with amount of fuel in tank)
MIL Operation
2 driving cycles
Sequence of Operation
None
Monitor runs whenever following DTCs not present
None
EVAP key-off monitor runs when all of following conditions met
-
Atmospheric pressure
70 to 110 kPa-a (525 to 825 mmHg-a)
Battery voltage
10.5 V or more
Vehicle speed
Below 2.5 mph (4 km/h)
Ignition switch
OFF
Time after key off
5 or 7 or 9.5 hours
Canister pressure sensor malfunction (P0450, P0451, P0452 and
P0453)
Not detected
Purge VSV
Not operated by scan tool
Vent valve
Not operated by scan tool
EVAP Pressure when EVAP System Leaks:
Purge VSV
Vent Valve
Leak Dtection
Pump
EVAP Pressure
Positive
Negative
First Reference
Pressure
Sequence
10 seconds
60
seconds
60
seconds
10
seconds
P0455
ON: Open
ON: Closed
OFF: Closed
OFF: Vent
P0456
Time
OK
A
B
C
D
E
ON
ON
ON
Within 15 minutes
[Second
Reference
Pressure] x 0.2
[Second
Reference
Pressure]
A106061E05
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