DTC SUMMARY
DTC No. |
Monitoring Item |
Malfunction Detection Condition |
Trouble Area |
Detection Timing |
Detection Logic |
---|---|---|---|---|---|
P0455 |
EVAP gross 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. |
|
While ignition switch off |
2 trip |
P0456 |
EVAP 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. |
While ignition switch off |
2 trip |
DESCRIPTION
The description can be found in EVAP (Evaporative Emission) System (See page ).
MONITOR DESCRIPTION
5 hours*1 after the ignition 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 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 |
Operation |
Description |
Duration |
---|---|---|---|
- |
ECM activation |
Activated by soak timer 5, 7 or 9.5 hours after ignition 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 kPa(abs) and 110 kPa(abs) [525 mmHg(abs) and 825 mmHg(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.
Text in Illustration
*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 |
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 the DTC (2 trip detection logic).
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 the 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
Monitor runs whenever the following DTCs are not stored |
None |
Atmospheric pressure |
70 kPa(abs) [525 mmHg(abs)] or higher, and less than 110 kPa(abs) [825 mmHg(abs)] |
Battery voltage |
10.5 V or higher |
Vehicle speed |
Less than 4 km/h (2.5 mph) |
Ignition 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 |
Conditions 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 complete |
Higher than [reference pressure x 0.2] |
EVAP pressure when vacuum introduction complete |
Between reference pressure and [reference pressure x 0.2] |
MONITOR RESULT
Refer to Checking Monitor Status (See page
).
CONFIRMATION DRIVING PATTERN
NOTICE:
Techstream Display |
Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
N/A |
|
HINT:
HINT:
PROCEDURE
1. |
REFER TO THE EVAP SYSTEM |
Refer to EVAP System (See page ).
NEXT |
END |
Vehicle Speed Sensor Malfunction (P0500)
DESCRIPTION
The vehicle speed sensors detect the wheel speed and send the appropriate signals
to the skid control ECU. The skid control ECU converts these wheel speed signals
into a 4-pulse signal and outputs it to the ECM via the combination meter assemb ...
Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART
HINT:
If a trouble code is displayed during the DTC check, inspect the trouble areas
listed for that code. For details of the code, refer to the following "See page".
Back Door Closer System
DTC Code
...
Lost Communication with ECM / PCM "A" (U0100)
DESCRIPTION
The engine control unit communicates with the TCM using the Controller Area Network
(CAN).
If there is a problem in this communication, the TCM sets a DTC.
DTC No.
DTC Detection Condition
Trouble Area
...