DTC SUMMARY |
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
MIL | Memory |
Note | | P142000 |
Evaporative Emission Canister (Small Leak) |
Leak
detection pump creates negative pressure (vacuum) in EVAP system and
EVAP system pressure is measured. Reference pressure is measured at the
start and at the end of leak check. If stabilized pressure is higher
than second reference pressure, ECM determines that EVAP system has a
small leak. |
- EVAP leak (purge VSV - canister - fuel vapor-containment valve)
- Purge VSV
- Connector/wire harness (purge VSV - ECM)
- Canister pump module
- ECM
| Comes on |
DTC stored | SAE Code: P1420 | |
P142100 | Evaporative Emission Canister (Gross Leak) |
Leak
detection pump creates negative pressure (vacuum) in EVAP system and
EVAP system pressure is measured. Reference pressure is measured at the
start and at the 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. |
- EVAP leak (purge VSV - canister - fuel vapor-containment valve)
- Purge VSV
- Connector/wire harness (purge VSV - ECM)
- Canister pump module
- ECM
| Comes on |
DTC stored | SAE Code: P1421 | |
DTC No. | Monitoring Item |
Detection Timing | Detection Logic |
SAE Code | | P142000 |
Canister small leak | EVAP monitoring
(Power switch off) |
2 trip | P1420 | |
P142100 | Canister gross leak |
P1421 | DESCRIPTION
Refer to EVAP (evaporative emission) System. Click here
 MONITOR DESCRIPTION
- P142000: EVAP (evaporative emission) 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 leak, illuminates the MIL and stores the DTC (2 trip
detection logic).
- P142100: 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 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 | | MIL Operation |
2 driving cycles | | Sequence of Operation |
None | TYPICAL ENABLING CONDITIONS |
Key-off monitor runs when all of the following conditions are met |
- | | Atmospheric pressure |
70 kPa(abs) [10.2 psi(abs)] or higher, and less than 110 kPa(abs) [16 psi(abs)] | |
Auxiliary battery voltage |
10.5 V or higher | |
Vehicle speed | Less than 4 km/h (2.5 mph) | |
Power switch | Off | |
Engine condition | Not running | |
Key-OFF duration | 5, 7 or 9.5 hours | |
Pressure sensor of canister pump module malfunction (P0451, P0452, P0453) |
Not detected | |
Fuel tank pressure sensor malfunction (P1451, P1452, P1453) |
Not detected | |
Purge VSV | Not operated by scan tool | |
Vent valve | Not operated by scan tool | |
Fuel vapor-containment valve |
Not operated by scan tool | |
Leak detection pump | Not operated by scan tool | |
Purge flow before key-OFF |
Performed | | Engine coolant temperature |
4.4°C (39.9°F) or higher, and less than 35°C (95°F) | |
Intake air temperature |
4.4°C (39.9°F) or higher, and less than 35°C (95°F) | TYPICAL MALFUNCTION THRESHOLDS P1420: EVAP Small Leak |
EVAP pressure when vacuum introduction for canister was complete |
Between conditions 1 and 2 | | Condition 1 |
Higher than second reference pressure | |
Condition 2 | Lower than [second reference pressure x 0.2] | P1421: EVAP Gross Leak |
EVAP pressure when vacuum introduction for canister was complete |
Higher than [second 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 9 steps
performed automatically by the Techstream. It takes a maximum of
approximately 40 minutes.
- Do not perform the Evaporative System Check when the fuel tank is higher
than 90% full because the cut-off valve may be closed, making the fuel
tank leak check unavailable.
- Do not start the engine during this operation.
- When the temperature of the fuel is 35°C (95°F) or higher, a large
amount of vapor will from and any check result will be 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 power switch on (IG).
- Turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the power switch off and wait for at least 30 seconds.
- Turn the power 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: P142000 or P142100.
- 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:
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
(a) Refer to EVAP System. Click here
| NEXT |
 | END | |
