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Emission Control - Lancer: Other Mitsubishi Lancer X

Testing & Diagnostics 7 illustrations ~882 words

VACUUM HOSE CHECK

  1. Using the VACUUM HOSE ROUTING diagram as a guide, check that the vacuum hoses are correctly connected.
  2. Check the connection of the vacuum hoses, (removed, loose, etc.) and confirm that there are no sharp bends or damage.

POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM CHECK

  1. Remove the ventilation hose from the positive crankcase ventilation (PCV) valve.
  2. Remove the PCV valve from the rocker cover.
  3. Reinstall the PCV valve at the ventilation hose.
  4. Start the engine and run at idle.
  5. Place a finger at the opening of the PCV valve and check that vacuum of the intake manifold is felt. NOTE: At this moment, the plunger in the PCV valve moves back and forth.
  6. If vacuum is not felt, clean the PCV valve or replace it.
  7. Apply a small amount of new engine oil to the O-ring on the PCV valve, and tighten to the specified torque. Standard value: 2.5 ± 0.4 N.m (22 in - lb)

Scheme 44

Scheme 44
Scheme 44

Scheme 45

Scheme 45: POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM CHECK
Scheme 45: POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM CHECK
  1. Remove the ventilation hose from the positive crankcase ventilation (PCV) valve.
  2. Remove the PCV valve from the rocker cover.
  3. Hold the PCV valve with the vacuum side down. Insert a thin rod, and using light pressure, depress the end of the PCV valve spring by 5 - 10 mm (0.2 - 0.3 inch). Release pressure on the rod to see if the PCV valve spring will lift the rod to its original position.
  4. If the rod returns quickly to its original position, the PCV valve is OK. If the stick does not return quickly, clean or replace the PCV valve.
  5. Apply a small amount of new engine oil to the O-ring on the PCV valve, and tighten to the specified torque. Standard value: 2.5 ± 0.4 N.m (22 in - lb)

MASS AIRFLOW SENSOR CHECK

To inspect the sensor, refer to DIAGNOSTIC TROUBLE CODE CHART .

INTAKE AIR TEMPERATURE SENSOR CHECK

To inspect the sensor, refer to DIAGNOSTIC TROUBLE CODE CHART .

MANIFOLD ABSOLUTE PRESSURE SENSOR CHECK

To inspect the sensor, refer to DIAGNOSTIC TROUBLE CODE CHART .

ENGINE COOLANT TEMPERATURE SENSOR CHECK

To inspect the sensor, refer to DIAGNOSTIC TROUBLE CODE CHART .

THROTTLE POSITION SENSOR CHECK

To inspect the sensor, refer to DIAGNOSTIC TROUBLE CODE CHART .

CRANKSHAFT POSITION SENSOR CHECK

To inspect the sensor, refer to DIAGNOSTIC TROUBLE CODE CHART .

EGR VALVE (STEPPER MOTOR) CHECK

Required Special Tool

MB991658: Test Harness Set

Checking the Operation Sound

  1. Check that the operation sound of the stepper motor can be heard from the EGR valve when the ignition switch is turned ON (without starting the engine).
  2. If the operation sound cannot be heard, inspect the drive circuit of the stepper motor. NOTE: If the operation sound is not heard, and the circuit is normal, either the stepper motor or the ECM may have failed.

Checking the Coil Resistance

Scheme 46

Scheme 46
Scheme 46

Scheme 47

Scheme 47
Scheme 47
  1. Remove the EGR valve.
  2. Measure the resistance between terminal No. 2 and either terminal No. 1 or terminal No. 3 of the connector at the EGR valve. Standard value: 20 - 24 ohms [at 20°C (68°F)]
  3. If the resistance is not within the standard, replace the EGR valve.
  4. Measure the resistance between terminal No. 5 and either terminal No. 6 or terminal No. 4 of the connector at the EGR valve. Standard value: 20 - 24 ohms [at 20°C (68°F)]
  5. If the resistance is not within the standard, replace the EGR valve.

Operation Check

Scheme 48

Scheme 48
Scheme 48

Scheme 49

Scheme 49
Scheme 49

Scheme 50

Scheme 50
Scheme 50
  1. Remove the EGR valve.
  2. Connect special tool MB991658 to the EGR valve.
  3. Connect the battery positive (+) terminal to terminal No. 2. CAUTION: Connecting battery voltage to the EGR valve for a long time could damage the coil.
  4. Connect terminals 1 and 3 to the negative (-) terminal of the battery, in order to test whether the stepper motor vibrates (with a slight shudder), indicating that the stepper motor is operating.
  5. Connect the battery positive (+) terminal to terminal No. 5. CAUTION: Connecting battery voltage to the EGR valve for a long time could damage the coil.
  6. Connect terminals 4 and 6 to the negative (-) terminal of the battery, in order to test whether the stepper motor vibrates (with a slight shudder), indicating that the stepper motor is operating.
  7. If vibrations can be felt as a result of the test, the stepper motor is determined to be normal.
  8. Using a new gasket, install the EGR valve by tightening its mounting bolts to the specified torque. Tightening torque: 24 ± 3 N.m (212 ± 27 in -1b)

EGR VALVE (STEPPER MOTOR) CLEANING

Note. DO not use solvents or other cleaning agents, which will enter the motor and cause a malfunction.

Remove the EGR valve and make sure that it is not stuck and does not have any carbon deposits. If there are any carbon deposits, use a wire brush to clean it.

To inspect the sensor, refer to DIAGNOSTIC TROUBLE CODE CHART .

To inspect the sensor, refer to DIAGNOSTIC TROUBLE CODE CHART .

To inspect the sensor, refer to DIAGNOSTIC TROUBLE CODE CHART .

To inspect the sensor, refer to DIAGNOSTIC TROUBLE CODE CHART .

ACCELERATOR PEDAL POSITION SENSOR CHECK

To inspect the sensor, refer to DIAGNOSTIC TROUBLE CODE CHART .

To inspect the sensor, refer to DIAGNOSTIC TROUBLE CODE CHART .

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