Test II
- Start engine. Disconnect vacuum hose from intake manifold and check vacuum. If there is no vacuum, check vacuum port. If there is vacuum, check the vacuum line for proper connection, cracks, blockage or disconnected hose. If the vacuum line is okay, reconnect vacuum hose.
- Disconnect solenoid valve connector. Attach positive probe of voltmeter to Black/Yellow terminal and negative probe to Light Green terminal. If there is voltage, check for short in Light Green wire between solenoid valve and ECU. If wire is okay, check ECU. If there is no voltage, replace solenoid valve and re-test.