VARIABLE BOOST CONTROL (VBC) SOLENOID VALVE INSPECTION [MZ-CD 1.6 (Y6)]

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1.  Remove the variable boost control (VBC) solenoid valve.

2.  Inspect the airflow between the ports under the following conditions:

•  If it is not as specified, replace the variable boost control (VBC) solenoid valve.

•  If it is as specified, perform the “Circuit Open/Short Inspection”.

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Circuit Open/Short Inspection

1.  Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6)].)

2.  Inspect the following wiring harness for an open or short circuit (continuity check).

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Open circuit

•  If there is no continuity, the circuit is open. Repair or replace the wiring harness.

―  Variable boost control (VBC) solenoid valve terminal A and PCM terminal 104

―  Variable boost control (VBC) solenoid valve terminal B and PCM control relay terminal E

Short circuit

•  If there is continuity, the circuit is shorted. Repair or replace the wiring harness.

―  Variable boost control (VBC) solenoid valve terminal B and body ground

―  Variable boost control (VBC) solenoid valve terminal A and body ground

―  Variable boost control (VBC) solenoid valve terminal A and power supply