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Engine - Intake-Air System (Lf 2.0L): Diagnosis Mazda MX-5 NC рестайлинг

Mechanical 10 illustrations ~842 words

INTAKE MANIFOLD VACUUM INSPECTION [LF]

  1. Verify that the intake air hoses are installed securely.
  2. Disconnect the vacuum hose connecting the intake manifold and the purge solenoid valve (purge solenoid valve side) and install the vacuum gauge.
  3. Warm up the engine.
  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 [LF]»(ref-430300-S05481664642011101700000) ). Air intake Each hose installation part Throttle body installation part Fuel injector installation part PCV valve installation part Dynamic chamber installation port Intake manifold installation part

Standard

72.2 kPa {-542 mmHg, -21.3 inHg} or more

AIR CLEANER ELEMENT INSPECTION [LF]

  1. Remove the air cleaner element. (See «INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [LF]»(ref-478572-S27568218632012061100000) ).
  2. Inspect the following items: If there is any abnormality, clean or replace the air cleaner element. (See «INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [LF]»(ref-478572-S27568218632012061100000) ). 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 seated? Is the correct air cleaner element installed?

Resistance Inspection

  1. Remove the battery cover. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) ).
  2. Disconnect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) ).
  3. Disconnect the throttle body connector.
  4. Measure the resistance between throttle actuator terminals A and B.
Ambient temperature (°C {°F})Resistance (ohm)
Approx. 20 {68}0.3-100

SPECIFICATION

Scheme 142

Scheme 142
Scheme 142
  1. If not as specified, replace the throttle body. (See «INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [LF]»(ref-478572-S27568218632012061100000) ).
  2. If as specified, carry out the "Circuit Open/Short Inspection". (See «CIRCUIT OPEN/SHORT INSPECTION»(ref-478572-S40077796212012061100000) ).

Scheme 143

Scheme 143: Circuit Open/Short Inspection
Scheme 143: Circuit Open/Short Inspection
  1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION [LF]»(ref-478574-S20052552792012061100000) ).
  2. Inspect the following wiring harnesses for open or short (continuity check).

Open circuit

  1. If there is no continuity, the circuit is open. Repair or replace the wiring harness. Throttle valve actuator terminal A and PCM terminal 2B Throttle valve actuator terminal B and PCM terminal 2A

Short circuit

  1. If there is continuity, the circuit is shorted. Repair or replace the wiring harness. Throttle valve actuator terminal A and power supply Throttle valve actuator terminal A and ground Throttle valve actuator terminal B and power supply Throttle valve actuator terminal B and ground

Scheme 144

Scheme 144: Airflow Inspection
Scheme 144: Airflow Inspection

Scheme 145

Scheme 145
Scheme 145
  1. Remove the battery cover. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) ).
  2. Disconnect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) ).
  3. Remove the variable intake air solenoid valve. (See «VARIABLE INTAKE AIR SOLENOID VALVE REMOVAL/INSTALLATION [LF]»(ref-478572-S10197431922012061100000) ).
  4. Inspect airflow between the ports under the following conditions. If not as specified, replace the variable intake air solenoid valve. (See «VARIABLE INTAKE AIR SOLENOID VALVE REMOVAL/INSTALLATION [LF]»(ref-478572-S10197431922012061100000) ). If as specified, carry out the "Circuit Open/Short Inspection". (See «CIRCUIT OPEN/SHORT INSPECTION»(ref-478572-S41918714982012061100000) ).

Scheme 146

Scheme 146: Circuit Open/Short Inspection
Scheme 146: Circuit Open/Short Inspection
  1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION [LF]»(ref-478574-S20052552792012061100000) ).
  2. Inspect the following wiring harness for open or short (continuity check).

Open circuit

  1. If there is no continuity, the circuit is open. Repair or replace the wiring harness. Variable intake air solenoid valve terminal B and PCM terminal 2J Variable intake air solenoid valve terminal A and main relay

Short circuit

  1. If there is continuity, the circuit is shorted. Repair or replace the wiring harness. Variable intake air solenoid valve terminal B and power supply Variable intake air solenoid valve terminal B and body ground Variable intake air solenoid valve terminal A and body ground

Scheme 147

Scheme 147: VARIABLE INTAKE AIR SOLENOID VALVE REMOVAL/INSTALLATION [LF]
Scheme 147: VARIABLE INTAKE AIR SOLENOID VALVE REMOVAL/INSTALLATION [LF]
  1. Remove the plug hole plate. (See «PLUG HOLE PLATE REMOVAL/INSTALLATION [LF]»(ref-430300-S30731392202011101700000) )
  2. Remove the battery cover. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) ).
  3. Disconnect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) ).
  4. Move the variable tumble solenoid valve (AT), slightly out of the way. (See «VARIABLE TUMBLE SOLENOID VALVE REMOVAL/INSTALLATION [LF]»(ref-478572-S16719948482012061100000) ).
  5. Remove in the order indicated in the table in figure.
  6. Install in the reverse order of removal.

Scheme 148

Scheme 148: AT
Scheme 148: AT
  1. Remove the plug hole plate. (See «PLUG HOLE PLATE REMOVAL/INSTALLATION [LF]»(ref-430300-S30731392202011101700000) )
  2. Remove the battery cover. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) ).
  3. Disconnect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) ).
  4. Remove in the order indicated in the table in figure.
  5. Install in the reverse order of removal.

Scheme 149

Scheme 149: Airflow Inspection
Scheme 149: Airflow Inspection

Scheme 150

Scheme 150
Scheme 150
  1. Remove the battery cover. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) ).
  2. Disconnect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) ).
  3. Remove the variable tumble solenoid valve. (See «VARIABLE TUMBLE SOLENOID VALVE REMOVAL/INSTALLATION [LF]»(ref-478572-S16719948482012061100000) ).
  4. Inspect airflow between the ports under the following conditions. If not as specified, replace the variable tumble solenoid valve. (See «VARIABLE TUMBLE SOLENOID VALVE REMOVAL/INSTALLATION [LF]»(ref-478572-S16719948482012061100000) ). If as specified, carry out the "Circuit Open/Short Inspection". (See «CIRCUIT OPEN/SHORT INSPECTION»(ref-478572-S40415918562012061100000) ).

Circuit Open/Short Inspection

  1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION [LF]»(ref-478574-S20052552792012061100000) ).
  2. inspect the following wiring harness for open or short (continuity check).

Open circuit

  1. If there is no continuity, the circuit is open. Repair or replace the wiring harness. Variable tumble solenoid valve terminal B and PCM terminal 2I Variable tumble solenoid valve terminal A and main relay

Short circuit

Scheme 151

Scheme 151
Scheme 151
  1. If there is continuity, the circuit is shorted. Repair or replace the wiring harness. Variable tumble solenoid valve terminal B and power supply Variable tumble solenoid valve terminal B and body ground Variable tumble solenoid valve terminal A and body ground

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