Engine - Intake-Air System: Other Mazda RX-8 I

Open Circuit

1. If there is no continuity, the circuit is open. Repair or replace the wiring harness. Throttle body terminal A (wiring harness-side) and PCM terminal 1B Throttle body terminal B (wiring harness-side) and PCM terminal 1C

Short Circuit

1. If there is continuity, the circuit is shorted. Repair or replace the wiring harness. Throttle body terminal A (wiring harness-side) and power supply Throttle body terminal A (wiring harness-side) and GND Throttle body terminal B (wiring harness-side) and power supply Throttle body terminal B (wiring harness-side) and GND

1. If there is no continuity, the circuit is open. Repair or replace the harness. VFAD solenoid valve terminal B (harness-side) and PCM terminal 5Z VFAD solenoid valve terminal A (harness-side) and main relay terminal C (harness-side)

1. If there is continuity, the circuit is shorted. Repair or replace the harness. VFAD solenoid valve terminal B (harness-side) and body GND VFAD solenoid valve terminal A (harness-side) and power supply

Scheme 28

Scheme 29

1. Remove the front bumper.
2. Disconnect the vacuum hose of the VFAD actuator.
3. Install the vacuum pump to the VFAD actuator.
4. Verify that the rod moves as indicated in the figure below when gradually applying a vacuum to the VFAD actuator. (Scheme 29) If it cannot be verified, replace the fresh-air duct. (See «INTAKE-AIR SYSTEM REMOVAL/INSTALLATION»(ref-178322-S25288823672005061400000).) Rod movement

Scheme 30

Scheme 31

1. Disconnect the negative battery cable.
2. Remove the SSV solenoid valve. (See «INTAKE-AIR SYSTEM REMOVAL/INSTALLATION»(ref-178322-S25288823672005061400000).)
3. Inspect for airflow using the steps in the figures. (Scheme 30) If it is normal, inspect related wiring harnesses. If there is any malfunction, replace the SSV solenoid valve.

Scheme 32

1. Disconnect the PCM connector.
2. Inspect the following wiring harness for open or short (continuity check).

1. If there is no continuity, the circuit is open. Repair or replace the harness. SSV solenoid valve terminal B (harness-side) and PCM terminal 1L SSV solenoid valve terminal A (harness-side) and main relay terminal C (harness-side)

1. If there is continuity, the circuit is shorted. Repair or replace the harness. SSV solenoid valve terminal B (harness-side) and body GND SSV solenoid valve terminal A (harness-side) and power supply

Scheme 33

Scheme 34

1. Disconnect the vacuum hose of the SSV actuator.
2. Install the vacuum pump to the SSV actuator.
3. Verify that the rod moves as indicated in the figure below when gradually applying a vacuum to the SSV actuator. (Scheme 34) If there is any malfunction, replace the intake manifold. (See «INTAKE MANIFOLD REMOVAL/INSTALLATION»(ref-178322-S34591999552005061400000).) Rod movement

Scheme 35

Scheme 36

1. Disconnect the negative battery cable.
2. Remove the VDI solenoid valve. (See «INTAKE-AIR SYSTEM REMOVAL/INSTALLATION»(ref-178322-S25288823672005061400000).)
3. Inspect for airflow with the steps in the figure below. (Scheme 36) If it is normal, inspect related wiring harnesses. If there is any malfunction, replace the VDI solenoid valve. (See «INTAKE-AIR SYSTEM REMOVAL/INSTALLATION»(ref-178322-S25288823672005061400000).)

1. If there is no continuity, the circuit is open. Repair or replace the harness. VDI solenoid valve terminal B (harness-side) and PCM terminal 1W VDI solenoid valve terminal A (harness-side) and main relay terminal C (harness-side)

Scheme 37

1. If there is continuity, the circuit is shorted. Repair or replace the harness. VDI solenoid valve terminal B (harness-side) and body GND VDI solenoid valve terminal A (harness-side) and power supply

Scheme 38

Scheme 39

1. Disconnect the VDI actuator vacuum hose.
2. Install the vacuum pump to the VDI actuator.
3. Verify that the rod moves as indicated in the figure below when gradually applying a vacuum to the VDI actuator. (Scheme 38) If it fails, replace the VDI actuator. (See «INTAKE MANIFOLD REMOVAL/INSTALLATION»(ref-178322-S34591999552005061400000).) Rod movement

Scheme 40

1. Remove the APV motor. (See «INTAKE-AIR SYSTEM REMOVAL/INSTALLATION»(ref-178322-S25288823672005061400000) .)
2. Measure the resistance between the APV motor terminals using an ohmmeter. If not as specified, replace the APV motor. (See «INTAKE-AIR SYSTEM REMOVAL/INSTALLATION»(ref-178322-S25288823672005061400000) .) If as specified, carry out the "Circuit Open/Short Inspection". APV motor resistance 8-50 ohms

1. If there is no continuity, the circuit is open. Repair or replace the wiring harness. APV motor terminal B and PCM terminal 3J APV motor terminal D and PCM terminal 3G

1. If there is continuity, the circuit is shorted. Repair or replace the wiring harness. APV motor terminal B and power supply APV motor terminal B and body GND APV motor terminal D and power supply APV motor terminal D and body GND

Scheme 41

1. Remove the check valve.
2. Verify that there is airflow at port B when blowing air by mouth from port A.
3. Verify that there is no airflow at port A when blowing air by mouth from port B. If it cannot be verified, replace the check valve.

Scheme 42

Scheme 43

1. Remove in the order indicated. (Scheme 42)
2. Install in the reverse order of removal.