Home ReviewsRefund
Home/Mazda/3/Mazda 3 BL (2008-2011)/Repair manual/Mechanical/Engine - Intake-Air System (Lf, L3): Diagnosis
Contents Wiring diagrams Section: Mechanical All sections

Engine - Intake-Air System (Lf, L3): Diagnosis Mazda 3 BL

Mechanical 1 illustration ~377 words

INTAKE AIR SYSTEM MANIFOLD VACUUM INSPECTION [LF, L3]

  1. Verify that the intake air hoses are installed securely.
  2. Warm up the engine.
  3. Disconnect the vacuum hose connecting the intake manifold and the purge solenoid valve (purge solenoid valve side) and install the vacuum gauge. (See «PURGE SOLENOID VALVE REMOVAL/INSTALLATION [LF, L3]»(ref-345261-S14174901112009102000000) .)
  4. Measure the intake manifold vacuum while idling (no load) using the vacuum gauge. If not within the specification, perform the following inspections. Accelerator cable play Compression pressure (See «COMPRESSION INSPECTION [LF, L3]»(ref-345205-S38965285782009102000000) .) 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 LF ATX: -55.0 kPa {-413 mmHg, -16.3 inHg} or more LF MTX: -57.0 kPa {-428 mmHg, -16.9 inHg} or more L3 ATX: -57.0 kPa {-428 mmHg, -16.9 inHg} or more L3 MTX: -60.0 kPa {-451 mmHg, -17.8 inHg} or more

AIR CLEANER ELEMENT INSPECTION [LF, L3]

  1. Remove the air cleaner element. (See «INTAKE AIR SYSTEM REMOVAL/INSTALLATION [LF, L3]»(ref-345212-S03134740962009102000000) ).
  2. Inspect the following items: If there is any abnormality, clean or replace the air cleaner element. Has the replacement interval come? Is the air cleaner element soiled, damaged, or bent? Are the air cleaner case and the air cleaner element correctly sealed? Is the correct air cleaner element installed?

THROTTLE BODY INSPECTION [LF, L3]

Note. Perform the following inspection only when directed.

Scheme 286

Scheme 286: Resistance Inspection
Scheme 286: Resistance Inspection
  1. Disconnect the negative battery cable.
  2. Disconnect the throttle body connector.
  3. Measure the resistance between throttle actuator terminals E and F. If not as specified, replace the throttle body. (See «INTAKE AIR SYSTEM REMOVAL/INSTALLATION [LF, L3]»(ref-345212-S03134740962009102000000) ) If as specified, carry out the "Circuit Open/Short Inspection". Specification RESISTANCE REFERENCE Ambient temperature (°C {°F}) Resistance (ohm) Approx. 20 {68} 0.3-100

Circuit Open/Short Inspection

  1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION [LF, L3]»(ref-345210-S40556685212009102000000) .)
  2. Inspect the following wiring harnesses for open or short (continuity check).
  1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION [LF, L3]»(ref-345210-S40556685212009102000000) .)
  2. Inspect the following wiring harness for open or short (continuity check).
  1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION [LF, L3]»(ref-345210-S40556685212009102000000) .)
  2. Inspect the following wiring harness for open or short (continuity check).

More articles — Engine - Intake-Air System (Lf, L3)