RM38N0EC _51 Engine / Hybrid System _111785 M20C-FKS, M20D-FKS ENGINE CONTROL _0504416 SFI SYSTEM C

M20C-FKS, M20D-FKS ENGINE CONTROL  SFI SYSTEM  P044312  EVAP System Purge Control Valve "A" Circuit Circuit Short to Battery  P044314  EVAP System Purge Control Valve "A" Circuit Circuit Short to Ground or Open  


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 Note
P044312 EVAP System Purge Control Valve "A" Circuit Circuit Short to Battery Both of the following conditions (a) and (b) are met (1 trip detection logic):
(a) The purge VSV operation duty signal is 5% or more.
(b) A short between the purge VSV circuit and power source circuit continues for 10 seconds or more.
·

Short in purge VSV circuit

·

Purge VSV

·

ECM


Comes on SAE Code: P0459
P044314 EVAP System Purge Control Valve "A" Circuit Circuit Short to Ground or Open Both of the following conditions (a) and (b) are met (1 trip detection logic):
(a) The purge VSV operation duty signal is 95% or less.
(b) An open or short in the purge VSV circuit continues for 10 seconds or more.
·

Open or short in purge VSV circuit

·

Purge VSV

·

ECM


Comes on SAE Code: P0458

MONITOR DESCRIPTION

The ECM monitors the output voltage while the purge VSV is operating.

The purge VSV is controlled by turning ON/OFF a transistor in the ECM to control the duty cycle.

If the duty cycle control and output voltage continue to not match, the ECM judges that there is a malfunction in the purge VSV circuit and illuminates the MIL and stores a DTC.

CONFIRMATION DRIVING PATTERN

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 hereEngine / Hybrid System>M20C-FKS, M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>DTC CHECK / CLEAR

·

When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>DTC CHECK / CLEAR



A179391E19
0.958,1.573 1.167,1.167 1.167,1.167 1.271,1.167 false 1.521,1.948 1.75,2.125 0.229,0.177 10 [A] 2.844,1.948 3.073,2.125 0.229,0.177 10 [B] 3.896,3.01 4.125,3.188 0.229,0.177 10 [C] 4.573,1.333 4.802,1.51 0.229,0.177 10 [D] 5.094,3.021 5.323,3.198 0.229,0.177 10 [E] 0.51,2.073 0.885,2.26 0.375,0.188 10 Idling 4.229,2.604 5.01,2.917 0.781,0.313 10 10 minutes or more 2.594,2.583 3.375,2.896 0.781,0.313 10 15 minutes or more 1.292,2.583 2.083,2.75 0.792,0.167 10 Warming up 1.333,1.073 2.906,1.396 1.573,0.323 10 Between 40 and 60 km/h 0.125,0.448 1.073,0.615 0.948,0.167 10 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 / 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 / Utility / All Readiness.

11.

Input the DTC: P044312 or P044314.

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



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, perform steps [D] and [E].

·

[A] to [C]: Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

·

When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.



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.

Enter the following menus: Powertrain / Engine / Trouble Codes [E].

15.

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.



16.

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

17.

Input the DTC: P044312 or P044314.

18.

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



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, perform the Confirmation Driving Pattern and check the DTC judgment result again.

·

[A] to [E]: Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

·

When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.




CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses of 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 EVAP PURGE VSV)
A409080C01
0.813,1.51 1.125,1.667 0.313,0.156 10 false *a 2.771,1.563 3.083,1.719 0.313,0.156 10 false *b
*a VSV is on
*b VSV is off


a.

Disconnect the fuel vapor feed hose (on the canister side) from the purge VSV.


b.

Start the engine.


c.

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

Powertrain > Engine > Active Test
Tester Display
Activate the EVAP Purge VSV
50004 372 1
OK:
GTS Operation Specified Condition
ON Purge VSV port applies suction to finger
OFF Purge VSV port applies no suction to finger


HINT:

Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.



Result:
Proceed to
OK
NG



OK

CHECK FOR INTERMITTENT PROBLEMS

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>CHECK FOR INTERMITTENT PROBLEMS


NG

2.INSPECT PURGE VSV
3.CHECK TERMINAL VOLTAGE (POWER SOURCE OF 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 Switch Condition Specified Condition

Click Location & Routing(C60)Location & Routing

Click Connector(C60)Engine Compartment>Engine Wire>No. 1 Vacuum Switching Valve Assembly

C60-1 - 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 NO. 1 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

Click Location & Routing(C60,C115)Location & Routing

Click Connector(C60)Engine Compartment>Engine Wire>No. 1 Vacuum Switching Valve Assembly

Click Connector(C115)Engine Compartment>Engine Wire>ECM

C60-2 - C115-102 (PRG) Always Below 1 Ω
C60-2 or C115-102 (PRG) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE ECM

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (ENGINE CONTROL)>ECM>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR