2NZ-FE ENGINE CONTROL  SFI SYSTEM  P0443  Evaporative Emission Control System Purge Control Valve Circuit  


DESCRIPTION

To reduce hydrocarbon (HC) emissions, evaporated fuel from the fuel tank is routed through a charcoal canister to the intake manifold for combustion in the cylinders.

The ECM changes the duty signals to the purge VSV (Vacuum Switching Valve for Purge Control) so that the intake amount of hydrocarbon (HC) emissions is appropriate for the driving conditions (engine load, engine speed, vehicle speed, etc.) after the engine is warmed up.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0443 Evaporative Emission Control System Purge Control Valve Circuit Both of the following conditions (a) and (b) are met (1 trip detection logic)
(a) The target control value and actual control value do not match for 10 seconds or more.
(b) The target control value and actual control value do not match for 80 times or more.
·

Open or short in purge VSV circuit

·

Purge VSV

·

ECM


Comes on DTC stored

CONFIRMATION DRIVING PATTERN

A179391E36
0.958,1.542 1.167,1.135 1.167,1.135 1.271,1.135 false 1.521,1.948 1.75,2.125 0.229,0.177 10 false [A] 2.844,1.948 3.073,2.125 0.229,0.177 10 false [B] 3.896,3 4.125,3.177 0.229,0.177 10 false [C] 4.573,1.333 4.802,1.51 0.229,0.177 10 false [D] 5.094,3 5.323,3.177 0.229,0.177 10 false [E] 0.51,2.073 0.885,2.26 0.375,0.188 10 false Idling 4.229,2.521 5.01,2.833 0.781,0.313 10 false 10 minutes or more 2.594,2.521 3.375,2.833 0.781,0.313 10 false 15 minutes or more 1.313,2.521 2.104,2.688 0.792,0.167 10 false Warming up 1.333,1.073 3.365,1.396 2.031,0.323 10 false Between 40 km/h and 60 km/h 0.167,0.302 1.115,0.469 0.948,0.167 10 false Vehicle Speed

1.

Connect the GTS to the DLC3.

2.

Turn the ignition switch to ON and turn the GTS on.

3.

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

4.

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

5.

Turn the ignition switch to ON and turn the GTS on.

6.

Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [A].

HINT:

The A/C switch and all accessory switches should be off.


7.

Idle the engine for 15 minutes or more [B].

HINT:

Check the EVAP (Purge) VSV item in the Data List. When the value of this item is between 5 and 95%, the judgment will be performed.


8.

Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].

9.

Read the pending DTCs.

HINT:
·

If a pending DTC is output, the system is malfunctioning.

·

If a pending DTC is not output, perform the following procedure.



10.

Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

11.

Input the DTC: P0443.

12.

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



HINT:
·

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 steps [D] and [E].



13.

Drive the vehicle at a constant speed between 40 and 60 km/h (25 and 37 mph) for 10 minutes or more [D].

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.


14.

Check the DTC judgment result again [E].


WIRING DIAGRAM

A298557E25
0.708,2.635 1.781,2.833 1.073,0.198 10 false Battery 1.219,0.875 2.292,1.073 1.073,0.198 10 false EFI-MAIN 0.51,1.573 1.583,1.771 1.073,0.198 10 false FL MAIN 2.323,1.781 3.396,1.979 1.073,0.198 10 false EFI-MAIN 2.219,0.604 2.396,0.802 0.177,0.198 10 false 5 2.219,1.344 2.396,1.542 0.177,0.198 10 false 2 2.969,1.344 3.146,1.542 0.177,0.198 10 false 1 2.99,0.604 3.167,0.802 0.177,0.198 10 false 3 4.292,0.969 5.365,1.167 1.073,0.198 10 false B19 3.469,0.854 4.542,1.052 1.073,0.198 10 false EFI NO. 2 4.292,1.135 5.365,1.333 1.073,0.198 10 false Purge VSV 4.344,0.615 4.521,0.813 0.177,0.198 10 false 2 4.938,0.615 5.115,0.813 0.177,0.198 10 false 1 5.438,0.521 5.729,0.729 0.292,0.208 10 false 49 5.427,2.271 5.719,2.479 0.292,0.208 10 false 44 5.396,2.74 5.688,2.948 0.292,0.208 10 false 104 5.406,0.708 5.771,0.896 0.365,0.188 10 false B56 5.396,2.458 5.76,2.646 0.365,0.188 10 false A56 5.396,2.927 5.76,3.115 0.365,0.188 10 false B56 5.729,2.354 6.354,2.635 0.625,0.281 10 false MREL 5.729,2.917 6.094,3.104 0.365,0.188 10 false E1 5.729,0.573 6.094,0.76 0.365,0.188 10 false PRG 6.052,3.375 6.417,3.563 0.365,0.188 10 false ECM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.


HINT:

Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.


PROCEDURE

1.PERFORM ACTIVE TEST USING GTS (ACTIVATE THE VSV FOR EVAP CONTROL)
A178201

a.

Disconnect the fuel vapor feed hose (charcoal canister side) of the purge VSV.


b.

Connect the GTS to the DLC3.


c.

Start the engine.


d.

Turn the GTS on.


e.

Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for Evap Control.

Powertrain > Engine and ECT > Active Test
Tester Display
Activate the VSV for Evap Control
50004 234 6

f.

When the purge VSV is operated using the GTS, check whether the port of the purge VSV applies suction your finger.

OK:
GTS Operation Specified Condition
ON Purge VSV port applies suction to finger
OFF Purge VSV port applies no suction to finger



Result:
Proceed to
OK
NG



OK

CHECK FOR INTERMITTENT PROBLEMS

Click hereEngine / Hybrid System>2NZ-FE ENGINE CONTROL>SFI SYSTEM>CHECK FOR INTERMITTENT PROBLEMS


NG

2.INSPECT PURGE VSV
2.INSPECT PURGE VSV
a.

Inspect the purge VSV.

Click hereEngine / Hybrid System>2NZ-FE EMISSION CONTROL>PURGE VALVE>INSPECTION


Result:
Proceed to
OK
NG



OK

3.CHECK TERMINAL VOLTAGE (POWER SOURCE OF PURGE VSV)

NG

REPLACE PURGE VSV

Click hereEngine / Hybrid System>2NZ-FE EMISSION CONTROL>PURGE VALVE>REMOVAL


3.CHECK TERMINAL VOLTAGE (POWER SOURCE OF PURGE VSV)
A194112C09
0.438,2.167 0.865,2.427 0.427,0.26 0.323,0.74 0.5,0.906 0.177,0.167 10 *a 0.531,2.24 0.979,2.49 0.448,0.25 10 B19
*a Front view of wire harness connector
(to Purge VSV)


a.

Disconnect the purge VSV connector.


b.

Turn the ignition switch to ON.


c.

Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Condition Specified Condition
B19-2 - Body ground Ignition switch ON 11 to 14 V



Result:
Proceed to
OK
NG



OK

4.CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN RELAY - PURGE VSV)

4.CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)
a.

Disconnect the purge VSV connector.


b.

Disconnect the ECM connector.


c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
B19-1 - B56-49 (PRG) Always Below 1 Ω
B19-1 or B56-49 (PRG) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE ECM

Click hereEngine / Hybrid System>2NZ-FE ENGINE CONTROL>ECM>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR