DTC SUMMARY |
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
MIL | Memory |
Note | | P045500 |
Evaporative Emission System Leak Detected (Large Leak) |
Leak
detection pump creates negative pressure (vacuum) in EVAP system and
EVAP system pressure is measured. Reference pressure is measured at
start and end of leak check. If stabilized pressure is higher than [second reference pressure x 0.2], ECM determines that EVAP system has a large leak. |
- Fuel tank cap (loose)
- Leakage from EVAP line (canister - fuel tank)
- Leakage from EVAP line (purge VSV - canister)
- Leakage from canister pump module
- Leakage from fuel tank
- Leakage from canister
| Comes on |
DTC stored | SAE Code: P0455 | |
P045600 | Evaporative Emission System Leak Detected (Very Small Leak) |
Leak
detection pump creates negative pressure (vacuum) in EVAP system and
EVAP system pressure is measured. Reference pressure measured at start
and end of leak check. If stabilized pressure is higher than second reference pressure, ECM determines that EVAP system has a small leak. |
- Fuel tank cap (loose)
- Leakage from EVAP line (canister - fuel tank)
- Leakage from EVAP line (purge VSV - canister)
- Leakage from canister pump module
- Leakage from fuel tank
- Leakage from canister
| Comes on |
DTC stored | SAE Code: P0456 | |
DTC No. | Monitoring Item |
Detection Timing | Detection Logic |
SAE | | P045500 |
EVAP gross leak |
EVAP monitoring (engine switch off) |
2 trip | P0455 | |
P045600 | EVAP small leak |
P0456 | DESCRIPTION
The description can be found in EVAP (Evaporative Emission) System. Click here
 MONITOR DESCRIPTION
5
hours* after the engine switch is turned off, the leak detection 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 less than 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 less than 35°C (95°F) 7 hours after the engine
switch is turned off, the monitor check starts 2.5 hours later. |
Sequence | Operation |
Description | Duration | |
- | ECM activation |
Activated by soak timer 5, 7 or 9.5 hours after engine switch turned off. |
- | | A |
Atmospheric pressure measurement | Vent valve is turned off (vent) and EVAP system pressure is measured by ECM in order to register atmospheric pressure.
If pressure in EVAP system is not between 70 to 110 kPa(abs) [10.15 to 15.95 psi(abs)], ECM cancels EVAP system monitor. |
60 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. |
360 seconds | |
C | EVAP system pressure measurement |
Vent valve is turned on (closed) to shut EVAP system. Negative pressure (vacuum) is created in EVAP system, and EVAP system pressure is then measured.
Write
down measured value as it 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 is opened and then EVAP system pressure is measured by ECM.
Large increase indicates normal. |
10 seconds | |
E | Second reference pressure measurement |
After
second reference pressure measurement, leak check is performed by
comparing first and second reference pressure measurements. If stabilized system pressure is higher than second reference pressure, ECM determines that EVAP system is leaking. |
60 seconds | |
- | Final check |
Atmospheric pressure is measured and then monitoring result is recorded by ECM. |
- | *: If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.
|
*1 | Purge VSV: Off (Closed) |
*2 | Purge VSV: On (Open) | |
*3 | Vent Valve: Off (Vent) |
*4 | Vent Valve: On (Closed) | |
*5 | Leak Detection Pump: Off |
*6 | Leak Detection Pump: On | |
*7 | Reference Orifice (0.02 inch) |
*8 | Canister Pressure Sensor | |
*9 | Canister |
*10 | Fuel Tank | |
*11 | Canister Pump Module |
*12 | Canister Filter | |
*a | Operation A:
Atmospheric Pressure Measurement |
*b | Operation B, E:
Reference Pressure Measurement | |
*c | Operation C:
EVAP System Pressure Measurement |
*d | Operation D:
Purge VSV Monitor | |
*e | Atmospheric Pressure |
*f | Negative Pressure |
- (a) P045500: EVAP (Evaporative Emission) 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 leak, illuminates the MIL
and stores this DTC (2 trip detection logic).
- (b) P045600: 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
second reference pressure, the ECM determines that the EVAP system has a
small leak, illuminates the MIL and stores this DTC (2 trip detection
logic). 
MONITOR STRATEGY |
Required Sensors/Components (Main) | Purge VSV
Canister pump module | | Required Sensors/Components (Related) |
- | | Frequency of Operation |
Once per driving cycle | | Duration |
Within 20 minutes (varies with amount of fuel in tank) | |
MIL Operation | 2 driving cycles | |
Sequence of Operation | None | TYPICAL ENABLING CONDITIONS |
Atmospheric pressure | 70 kPa(abs) [10.15 psi(abs)] or higher, and less than 110 kPa(abs) [15.95 psi(abs)] | |
Battery voltage | 10.5 V or higher | |
Vehicle speed | Less than 4 km/h (2.5 mph) | |
Engine switch | Off | |
Time after key-off | 5, 7 or 9.5 hours | |
Canister pressure sensor malfunction (P0452, P0453) |
Not detected | | Purge VSV |
Not operated by scan tool | |
Vent valve | Not operated by scan tool | |
Leak detection pump | Not operated by scan tool | |
Both of following conditions met before-key off |
1 and 2 | | 1. Duration that vehicle is driven |
5 minutes or more | | 2. EVAP purge operation |
Performed | | Engine coolant temperature |
4.4°C (40°F) or higher, and less than 35°C (95°F) | |
Intake air temperature | 4.4°C (40°F) or higher, and less than 35°C (95°F) | TYPICAL MALFUNCTION THRESHOLDS P0455: EVAP Gross Leak |
EVAP pressure when vacuum introduction is complete |
Higher than [reference pressure x 0.2] | P0456: EVAP Small Leak |
EVAP pressure when vacuum introduction is complete |
Between reference pressure and [reference pressure x 0.2] | MONITOR RESULT
Refer to EVAP system. Click here CONFIRMATION DRIVING PATTERN
NOTICE:
- The Evaporative System Check (Automatic Mode) consists of 6 steps
performed automatically by the Techstream. It takes a maximum of
approximately 24 minutes.
- Do not perform the Evaporative System Check when the fuel tank is higher
than 85% full because the cut-off valve may be closed, making the fuel
tank leak check unavailable.
- Do not run the engine during this operation.
- When the temperature of the fuel is 35°C (95°F) or higher, a large
amount of vapor forms and any check results become inaccurate. When
performing the Evaporative System Check, keep the fuel temperature less
than 35°C (95°F).
HINT:
- After repair has been completed, clear the DTC and then check that the
vehicle has returned to normal by performing the following All Readiness
check procedure.
Click here
- When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here
- Connect the Techstream to the DLC3.
- Turn the engine switch on (IG).
- Turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the engine switch off and wait for at least 30 seconds.
- Turn the engine switch on (IG) [A].
- Turn the Techstream on.
- Enter the following menus: Powertrain / Engine / Utility / Evaporative System Check / Automatic Mode [B].
- After the Evaporative System Check is completed, check for All Readiness
by entering the following menus: Powertrain / Engine / Utility / All
Readiness.
- Input the DTC: P045500 or P045600.
- Check the DTC judgment result.
|
Techstream Display |
Description |
|
NORMAL |
- DTC judgment completed
- System normal
|
|
ABNORMAL |
- DTC judgment completed
- System abnormal
|
|
INCOMPLETE |
- DTC judgment not completed
- Perform driving pattern after confirming DTC enabling conditions
|
HINT:
PROCEDURE
(a) Refer to EVAP System. Click here
| NEXT |
 | END | |
