#
VARIABLE BOOST CONTROL (VBC) SOLENOID VALVE INSPECTION [MZR-CD (RF Turbo)]

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## Air Tightness Inspection

1. Connect a vacuum pump to the VBC solenoid valve port A, and apply vacuum.

  Note

  • Even if there is vacuum leakage, the VBC solenoid valve is okay if vacuum increases to -47 kPa {-353 mmHg, -14 inHg} or more.

2. Verify that the vacuum increases to -47 kPa {-353 mmHg, -14 inHg} or more.

  • If not as specified, replace the VBC solenoid valve.
  • If VBC solenoid valve is okay, perform the "Operation Inspection".

## Operation Inspection

1. Connect a vacuum pump to the VBC solenoid valve port A, and apply vacuum.

2. Turn the engine switch to ON.

3. Simulate the VBCV PID to 100% using the WDS or equivalent.

4. Verify that the vacuum is decreased.

  • If not as specified, replace the VBC solenoid valve.
  • If VBC solenoid valve is okay, perform the "Resistance Inspection".

## Resistance Inspection

  Note

  • Perform the following test only when directed.

1. Disconnect the negative battery cable.

2. Disconnect the VBC solenoid valve connector.

3. Measure the resistance between the VBC solenoid valve terminals using an ohmmeter.

  • If not as specified, replace the VBC solenoid valve.
  • If VBC solenoid valve is okay, perform the "Circuit Open/Short Inspection".

Specification

  11-13 ohms [20°C {68°F}]

## Circuit Open/Short Inspection

1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)

2. Remove the PCM control relay.

3. Inspect for open/short circuit in the following wiring harnesses.

  • If there is open/short circuit, repair or replace wiring harnesses.

### Open circuit

  • If there is no continuity, the circuit is open. Repair or replace the wiring harness.
  - VBC solenoid valve terminal A and PCM control relay terminal C
  - VBC solenoid valve terminal B and PCM terminal 6

### Short circuit

  • If there is continuity, the circuit is shorted. Repair or replace the wiring harness.
  - VBC solenoid valve terminal A and power supply
  - VBC solenoid valve terminal A and body ground
  - VBC solenoid valve terminal B and power supply
  - VBC solenoid valve terminal B and body ground