SFI SYSTEM(w/ Canister Pump Module), Diagnostic DTC:P04417E, P04417F, P04419C

DTC Code	DTC Name
P04417E	Evaporative Emission System Incorrect Purge Flow Actuator Stuck On
P04417F	Evaporative Emission System Incorrect Purge Flow Actuator Stuck Off
P04419C	Evaporative Emission System Incorrect Purge Flow Low/Insufficient Flow

DTC SUMMARY

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P04417E	Evaporative Emission System Incorrect Purge Flow Actuator Stuck On	Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure measured. Reference pressure is measured at start and at end of leak check. If stabilized pressure higher than [second reference pressure x 0.2], ECM determines that purge VSV stuck open.	Short in purge VSV circuit Purge VSV Canister pump module ECM	Comes on	DTC stored	SAE Code: P0441
P04417F	Evaporative Emission System Incorrect Purge Flow Actuator Stuck Off	After EVAP leak check performed, purge VSV turned on (open), and atmospheric air introduced into EVAP system. Reference pressure is measured at start and at end of check. If pressure does not return to near atmospheric pressure, ECM determines that purge VSV stuck closed.	Open or short in purge VSV circuit Purge VSV Canister pump module Purge line Canister (filter inside canister clogged) No. 1 charcoal canister filter (filter inside canister clogged) Semiconductor pwr integration ECU ECM	Comes on	DTC stored	SAE Code: P0441
P04419C	Evaporative Emission System Incorrect Purge Flow Low/Insufficient Flow	While engine running, following conditions successively met: Negative pressure not created in EVAP system when purge VSV turned on (open) EVAP system pressure change less than 0.154 kPa(gauge) [0.022 psi(gauge)] when vent valve turned on (closed) Atmospheric pressure change before and after purge flow monitor less than 0.1 kPa(gauge) [0.015 psi(gauge)]	Open or short in purge VSV circuit Purge VSV Canister pump module Purge line Canister (filter inside canister clogged) No. 1 charcoal canister filter (filter inside canister clogged) Semiconductor pwr integration ECU ECM	Comes on	DTC stored	SAE Code: P0441

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P04417E

Evaporative Emission System Incorrect Purge Flow Actuator Stuck On

Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure measured. Reference pressure is measured at start and at end of leak check.

If stabilized pressure higher than [second reference pressure x 0.2], ECM determines that purge VSV stuck open.

Short in purge VSV circuit
Purge VSV
Canister pump module
ECM

Comes on

DTC stored

SAE Code: P0441

P04417F

Evaporative Emission System Incorrect Purge Flow Actuator Stuck Off

After EVAP leak check performed, purge VSV turned on (open), and atmospheric air introduced into EVAP system. Reference pressure is measured at start and at end of check.

If pressure does not return to near atmospheric pressure, ECM determines that purge VSV stuck closed.

Open or short in purge VSV circuit
Purge VSV
Canister pump module
Purge line
Canister (filter inside canister clogged)
No. 1 charcoal canister filter (filter inside canister clogged)
Semiconductor pwr integration ECU
ECM

Comes on

DTC stored

SAE Code: P0441

P04419C

Evaporative Emission System Incorrect Purge Flow Low/Insufficient Flow

While engine running, following conditions successively met:

Negative pressure not created in EVAP system when purge VSV turned on (open)
EVAP system pressure change less than 0.154 kPa(gauge) [0.022 psi(gauge)] when vent valve turned on (closed)
Atmospheric pressure change before and after purge flow monitor less than 0.1 kPa(gauge) [0.015 psi(gauge)]

Open or short in purge VSV circuit
Purge VSV
Canister pump module
Purge line
Canister (filter inside canister clogged)
No. 1 charcoal canister filter (filter inside canister clogged)
Semiconductor pwr integration ECU
ECM

Comes on

DTC stored

SAE Code: P0441

DTC No.	Monitoring Item	Detection Timing	Detection Logic	SAE
P04417E	Purge VSV (Vacuum Switching Valve) stuck open	EVAP monitoring (engine switch off)	2 trip	P0441
P04417F	Purge VSV stuck closed	EVAP monitoring (engine switch off)	2 trip	P0441
P04419C	Purge flow	Engine running	2 trip	P0441

DTC No.

Monitoring Item

Detection Timing

Detection Logic

SAE

P04417E

Purge VSV (Vacuum Switching Valve) stuck open

EVAP monitoring

(engine switch off)

2 trip

P0441

P04417F

Purge VSV stuck closed

EVAP monitoring

(engine switch off)

2 trip

P0441

P04419C

Purge flow

Engine running

2 trip

P0441

DESCRIPTION

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

Click here

MONITOR DESCRIPTION

The 2 monitors, Key-off and purge flow, are used to detect malfunctions relating to DTCs P04417E, P04417F and P04419C. The Key-Off monitor is initiated by the ECM internal timer, known as the soak timer, 5 hours after the engine switch is turned off. The purge flow monitor runs while the engine is running.

KEY-OFF MONITOR

5 hours* after the engine switch is turned off, the electric 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.

Tech Tips

*: 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 kPa(abs) and 110 kPa(abs) [10.15 psi(abs) and 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 opened and then EVAP system pressure is measured by ECM. A large increase indicates normality.	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 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

Purge VSV stuck open

In operation C, the leak detection pump creates negative pressure (vacuum) in the EVAP (Evaporative Emission) system. The EVAP system pressure is then measured by the ECM using the canister pressure sensor. If the stabilized system pressure is higher than [second reference pressure x 0.2], the ECM interprets this as the purge VSV being stuck open. If any deterioration has occurred, the ECM will illuminate the MIL and store DTC P04417E (2 trip detection logic).
Purge VSV stuck closed

In operation D, the canister pressure sensor measures the EVAP (Evaporative Emission) system pressure. The pressure measurement for the purge VSV monitor begins when the purge VSV is turned on (open) after the EVAP leak check. When the measured pressure indicates an increase of 0.3 kPa(gauge) [0.044 psi(gauge)] or higher, the purge VSV is functioning normally. If the pressure does not increase, the ECM interprets this as the purge VSV being stuck closed, illuminates the MIL and store DTC P04417F (2 trip detection logic).

PURGE FLOW MONITOR

The purge flow monitor consists of 2 monitors. The 1st monitor is conducted every time and the 2nd monitor is activated if necessary.

The 1st monitor

While the engine is running and the purge VSV is on (open), the ECM monitors the purge flow by measuring the EVAP pressure change. If negative pressure is not created, the ECM begins the 2nd monitor.
The 2nd monitor

The vent valve is turned on (closed) and the EVAP pressure is then measured. If the variation in the pressure is less than 0.154 kPa(gauge) [0.022 psi(gauge)], the ECM interprets this as the purge VSV being stuck closed, illuminates the MIL and stores DTC P04419C (2 trip detection logic).

Atmospheric pressure check:

In order to ensure reliable malfunction detection, the variation in atmospheric pressures, before and after conduction of the purge flow monitor, is measured by the ECM.

MONITOR STRATEGY

Required Sensors/Components

Purge VSV

Canister pump module

Frequency of Operation

Once per driving cycle

CONFIRMATION DRIVING PATTERN

Connect the GTS to the DLC3.
Turn the engine switch on (IG) and turn the GTS 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) and turn the GTS on.
Start the engine and wait 15 minutes or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
Tech Tips
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P04417E, P04417F or P04419C.

Check the DTC judgment result.

GTS Display	Description
NORMAL	DTC judgment completed System normal
ABNORMAL	DTC judgment completed System abnormal
INCOMPLETE	DTC judgment not completed You should 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.
If the judgment result shows INCOMPLETE or N/A, perform the following procedure.

Note

The Evaporative System Check (Automatic Mode) consists of 6 steps performed automatically by the GTS. 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 less than 35°C (95°F).

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) and turn the GTS on.
Enter the following menus: Powertrain / Engine / Utility / Evaporative System Check / Automatic Mode.
After the Evaporative System Check is completed, check for All Readiness by entering the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P04417E, P04417F or P04419C.

Check the DTC judgment result.

GTS 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.

PROCEDURE

GO TO EVAP SYSTEM

Refer to EVAP System.

Click here

Result

Proceed to
NEXT

END