SFI SYSTEM, Diagnostic DTC:P043E, P043F, P2401, P2402, P2419

DTC Code DTC Name
P043E Evaporative Emission System Leak Detection Reference Orifice Low Flow
P043F Evaporative Emission System Reference Orifice High Flow
P2401 Evaporative Emission Leak Detection Pump Stuck OFF
P2402 Evaporative Emission Leak Detection Pump Stuck ON
P2419 Evaporative Emission System Switching Valve Control Circuit Low

DTC SUMMARY

DTC No. Monitoring Item Malfunction Detection Condition Trouble Area Detection Timing Detection Logic
P043E Reference orifice clogged

P043E, P043F, P2401, P2402 and P2419 stored when one of following conditions met during key-off EVAP monitor:


  • Reference orifice clogged

  • Reference orifice high-flow

  • Leak detection pump off malfunction

  • Leak detection pump on malfunction

  • Vent valve on (closed) malfunction

  • Canister pump module

  • Connector/wire harness (Canister pump module - ECM)

  • ECM

 While power switch off 2 trip
P043F Reference orifice high-flow
P2401 Leak detection pump stuck off
P2402 Leak detection pump stuck on
P2419 Vent valve stuck closed

Tech Tips

The reference orifice is located inside the canister pump module.

DESCRIPTION

The description can be found in EVAP (Evaporative Emission) System Click here.

MONITOR DESCRIPTION

5 hours* after the power switch is turned 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.

Tech Tips

*: If the engine coolant temperature is not less than 35°C (95°F) 5 hours after the power 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 power 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 power 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.

A01HTUYE01
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 No. 1 Canister
*11 No. 2 Canister *12 Canister Pump Module
*13 Canister Filter *14 Fuel Tank
*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

The leak detection pump creates negative pressure through the reference orifice (in operation B and E). When the system is normal, the EVAP pressure is between 97 to 100 kPa(abs) [726 to 750 mmHg(abs)]* and saturated within a minute. If not, the ECM interprets this as a malfunction. The ECM illuminates the MIL and stores a DTC if this malfunction is detected in consecutive drive cycles.

*: Typical value.

A01HTB9E58

MONITOR STRATEGY

Required Sensors/Components (Main) Canister pump module
Required Sensors/Components (Related) -
Frequency of Operation Once per driving cycle
Duration Within 7 minutes
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)]
Auxiliary battery voltage 10.5 V or higher
Vehicle speed Less than 4 km/h (2.5 mph)
Power 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 are 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

"Saturated" indicates that the EVAP pressure change is less than 0.286 kPa(gauge) [2.145 mmHg(gauge)] in 60 seconds.

One of the following conditions is met -
EVAP pressure just after reference pressure measurement started Higher than -0.25 kPa(gauge) [-1.875 mmHg(gauge)]
Reference pressure Less than -4.85 kPa(gauge) [-36.38 mmHg(gauge)]
Reference pressure -1.057 kPa(gauge) [-7.929 mmHg(gauge)] or higher
Reference pressure Not saturated within 360 seconds
Reference pressure difference between first and second 0.9 kPa(gauge) [6.751 mmHg(gauge)] or higher

MONITOR RESULT

Refer to EVAP system Click here.

CONFIRMATION DRIVING PATTERN

Note


  • 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 90% 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 below 35°C (95°F).


  1. Connect the Techstream to the DLC3.

  2. Turn the power switch on (IG) and turn the Techstream on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the power switch off and wait for at least 30 seconds.

  5. Turn the power switch on (IG) and turn the Techstream on.

  6. Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.

  7. After the "Evaporative System Check" is completed, check for All Readiness by entering the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  8. Input the DTC: P043E, P043F, P2401, P2402 or P2419.

  9. 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
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

  10. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs Click here.

    Tech Tips


    • If a permanent DTC is output, the system is malfunctioning.

    • If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

Refer to EVAP System Click here.