I have a code for a EVAP purge valve/solenoid

SHAUN2

MEMBER
2001 MITSUBISHI GALANT
145,600 MILES

I have a code for a evap purge valve/solenoid. P0443 Where is this part located on this vehicle? Will this problem cause the car to shut off while stopped and it does not matter if the engine is cold or hot? I have cleared this code 2 times and has come right back so I know its a real problem.

2 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Under the throttle body toward the front of the motor.

How did you verify it is bad?

Codes never identify bad parts, just failed systems

Roy

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Thursday, March 28th, 2013 AT 12:32 AM

ASEMASTER6371

MECHANIC
52,797 POSTS

Flow chart

CIRCUIT OPERATION
-Power to the evaporative emission purge solenoid power is supplied from the MFI relay (terminal 1).

The PCM controls ground evaporative emission purge solenoid by turning the power transistor in the PCM "ON" and ""OFF" ".

TECHNICAL DESCRIPTION

To judge if there is open circuit in the evaporative emission purge solenoid drive circuit, PCM measures the surge voltage of the evaporative emission ventilation solenoid coil.
The PCM drives the evaporative emission purge solenoid for 30 milliseconds. After the solenoid is turned off, the PCM will check if the solenoid coil produces a surge voltage of 2 V or more.

DTC SET CONDITIONS

Check Conditions

Battery positive voltage is higher than 10 V.

Judgment Criteria

If a surge voltage of 2 V or more is not detected within 30 milliseconds after the evaporative emission purge solenoid is driven, the PCM judges that the drive circuit is open.
Only one monitor during one drive cycle.

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)

Evaporative emission purge solenoid failed.
Open or shorted evaporative emission purge solenoid circuit, or loose connector.
PCM failed.

DIAGNOSIS

Required Special Tools
MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, check actuator test item 08: Evaporative Emission Purge Solenoid.

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" ("OFF" ) position before connecting or disconnecting scan tool MB991502.

Connect scan tool MB991502 to the data link connector.
Turn the ignition switch to the "ON" position.
Set scan tool MB991502 to the actuator test mode for item 08, Evaporative emission purge solenoid.

An operation sound should be heard and vibration should be felt when the evaporative emission purge solenoid is operated.

Turn the ignition switch to the "LOCK" ("OFF" ) position.

Q: Is the solenoid operating properly?

YES: It can be assumed that this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points.

NO: Go to Step 2.

STEP 2. Check connector B-18 at the evaporative emission purge solenoid for damage.
Q: Is the connector in good condition?

YES: Go to Step 3.

NO: Repair or replace it. Refer to Harness Connector Inspection. Then go to Step 12.

STEP 3. Check the evaporative emission purge solenoid.

Disconnect the evaporative emission purge solenoid connector B-18.
Measure the resistance between evaporative emission purge solenoid side connector terminal 1 and 2. Standard value: 30 - 34 ohms [at 20 °C (68 °F)]

Q: Is the resistance at the standard value?

YES: Go to Step 4.

NO: Replace the evaporative emission purge solenoid. Then go to Step 12.

STEP 4. Check the power supply voltage at evaporative emission purge solenoid harness side connector B-18.

Disconnect the connector B-18 and measure at the harness side.
Turn the ignition switch to the "ON" position.

Measure the voltage between terminal 2 and ground.

Voltage should be battery positive voltage.

Turn the ignition switch to the "LOCK" ("OFF" ) position.

Q: Is the voltage normal?

YES: Go to Step 6.

NO: Go to Step 5.

STEP 5. Check connector A-21X at MFI relay for damage.
Q: Is the connector in good condition?

YES: Repair harness wire between MFI relay connector A-21X terminal 1 and evaporative emission purge solenoid connector B-18 terminal 2 because of open circuit or short circuit to ground. Then go to Step 12.

NO: Repair or replace it. Refer to Harness Connector Inspection. Then go to Step 12.

STEP 6. Check the power supply voltage at PCM connector C-39 by backprobing

Do not disconnect the connector C-39.
Turn the ignition switch to the "ON" position.

Measure the voltage between terminal 9 or 34and ground by backprobing.

Voltage should be battery positive voltage.

Turn the ignition switch to the "LOCK" ("OFF" ) position.

Q: Is the voltage normal?

YES: Go to Step 9.

NO: Go to Step 7.

STEP 7. Check connector C-39 at PCM for damage.
Q: Is the connector in good condition?

YES: Go to Step 8.

NO: Repair or replace it. Refer to Harness Connector Inspection. Then go to Step 12.

STEP 8. Check for open circuit and short circuit to ground between evaporative emission purge solenoid connector B-18 terminal 1 and PCM connector C-39 terminal 34
.Q: Is the harness wire in good condition?

YES: Replace the PCM. Then go to Step 12.

NO: Repair it. Then go to Step 12.

STEP 9. Check connector C-39 at PCM for damage.
Q: Is the connector in good condition?

YES: Go to Step 10.

NO: Repair or replace it. Refer to Harness Connector Inspection. Then go to Step 12.

STEP 10. Check for harness damage between MFI relay connector A-21X terminal 1 and evaporative emission purge solenoid connector B-18 terminal 2.
Q: Is the harness wire in good condition?

YES: Go to Step 11.

NO: Repair it. Then go to Step 12.

STEP 11. Check for harness damage between evaporative emission purge solenoid connector B-18 terminal 1 PCM connector C-39 terminal 34.
Q: Is the harness wire in good condition?

YES: Replace the PCM. Then go to Step 12.

NO: Repair it. Then go to Step 12.

STEP 12. Test the OBD-II drive cycle.

Carry out a test drive with the drive cycle pattern. Refer to Procedure 6 - Other Monitor.
Check the diagnostic trouble code (DTC).

Q: Is the DTC P0443 is output?

YES: Retry the troubleshooting.

NO: The inspection is complete.