Engine - Intake-Air System (L3 with TC): Diagnosis Mazda 3 BL

INTAKE AIR SYSTEM MANIFOLD VACUUM INSPECTION [L3 WITH TC]

1. Verify that the intake air hoses are installed securely.
2. Warm up the engine.
3. Disconnect the vacuum hose connected between the check valve and the intake manifold from the intake manifold and install the vacuum gauge. (See «QUICK RELEASE CONNECTOR REMOVAL/INSTALLATION [L3 WITH TC]»(ref-345226-S06372246912009102000000) )
4. Measure the intake manifold vacuum while idling (no load) using the vacuum gauge. If not within the specification, perform the following inspections. Compression pressure (See «COMPRESSION INSPECTION [L3 WITH TC]»(ref-345224-S21344569072009102000000) .) Air suction (installation areas of throttle body, fuel injector, PCV valve, intake manifold) NOTE: If any air suction exists, the change in engine speed can be made apparent by spraying the penetrant lubricating spray on the applicable part. Standard -73 kPa {-548 mmHg, -22 inHg} or more

AIR CLEANER ELEMENT INSPECTION [L3 WITH TC]

1. Remove the air cleaner element. (See «INTAKE AIR SYSTEM REMOVAL/INSTALLATION [L3 WITH TC]»(ref-345225-S13656146802009102000000) ).
2. Verify that the air cleaner element surface is free of dirt. If there is dirt, use an air gun or similar tool to clean the element. If the replacement time limit has passed, replace the element.

Scheme 306

1. Remove the charge air cooler cover. (See «INTAKE AIR SYSTEM REMOVAL/INSTALLATION [L3 WITH TC]»(ref-345225-S13656146802009102000000) ).
2. Remove the charge air cooler. (See «INTAKE AIR SYSTEM REMOVAL/INSTALLATION [L3 WITH TC]»(ref-345225-S13656146802009102000000) ).
3. Remove the air bypass valve. (See «INTAKE AIR SYSTEM REMOVAL/INSTALLATION [L3 WITH TC]»(ref-345225-S13656146802009102000000) ).
4. Plug ports A and B.
5. Verify that there is no air leakage when air is sent from port C. If there is leakage, replace the charge air cooler.

Scheme 307

Scheme 308

1. Remove the air bypass valve. (See «INTAKE AIR SYSTEM REMOVAL/INSTALLATION [L3 WITH TC]»(ref-345225-S13656146802009102000000) ).
2. Connect the vacuum pump to the vacuum ports of the air bypass valve.
3. Verify that the airflow is as indicated in the table. If there is any malfunction, replace the air bypass valve. VACUUM SPECIFICATION Vacuum (kPa {mmHg, inHg}) Valve operation condition Airflow between port A-B -66 {-496, -20} or more Open Yes -49 {-367, -14} or less Closed No Approx. value

THROTTLE ACTUATOR INSPECTION [L3 WITH TC]

Note. Perform the following inspection only when directed.

Resistance Inspection

1. Remove the battery cover. (See «BATTERY REMOVAL/INSTALLATION [L3 WITH TC]»(ref-345228-S02486648752009102000000) .)
2. Disconnect the negative battery cable.
3. Disconnect the throttle body connector.
4. Measure the resistance between the throttle actuator terminals using a tester. If not as specified, replace the throttle body. (See «INTAKE AIR SYSTEM REMOVAL/INSTALLATION [L3 WITH TC]»(ref-345225-S13656146802009102000000) ). If as specified, carry out the "Circuit Open/Short Inspection". Specification AMBIENT TEMPERATURE AND RESISTANCE SPECIFICATION Ambient temperature (°C {°F}) Resistance (ohm) Approx. 20 {68} 0.3-100

Scheme 309

1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION [L3 WITH TC]»(ref-345229-S41780515662009102000000) .)
2. Inspect the following wiring harnesses for an open or short circuit (continuity check).

Scheme 310

VARIABLE SWIRL SHUTTER VALVE ACTUATOR INSPECTION [L3 WITH TC]

1. Remove the air hose. (See «INTAKE AIR SYSTEM REMOVAL/INSTALLATION [L3 WITH TC]»(ref-345225-S13656146802009102000000) ).
2. Disconnect the vacuum hose from the variable swirl control solenoid valve.
3. Connect a vacuum pump to the variable swirl shutter valve actuator.
4. Apply vacuum and verify that the rod moves. If the rod does not move, replace the intake manifold. (See «INTAKE AIR SYSTEM REMOVAL/INSTALLATION [L3 WITH TC]»(ref-345225-S13656146802009102000000) ). VACUUM SPECIFICATION Vacuum kPa {mmHg, inHg} Rod movement -2.7 {-20, -0.7} or less Not move -33.4 {-251, -9.9} or more Fully pulled

Scheme 311

Scheme 312

1. Remove the variable swirl solenoid valve.
2. Inspect the airflow between the ports under the following conditions. If not as specified, replace the variable swirl control solenoid valve. If as specified, carry out the "Circuit Open/Short Inspection".

Scheme 313

Scheme 314

Scheme 315

1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION [L3 WITH TC]»(ref-345229-S41780515662009102000000) .)
2. Inspect the following wiring harness for open or short circuit (continuity check).