honda Workshop Repair Guides

Honda Workshop Service and Repair Manuals

Symptom Related Diagnostic Procedures|Page 1979 > < Symptom Related Diagnostic Procedures|Page 1977
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1. Check the vacuum line for proper connection, cracks, blockage or disconnected hoses.
2. Warm up the engine to normal operating temerature (the cooling fan comes only.

NOTE: Apply parking brake securely.

3. Disconnect the # 18 vacuum hose from the air flow tube and connect a vacuum gauge to the hose.

There should be no vacuum.

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If there is vacuum, go to solenoid valve test II.

4. Shift transmission into "D3" or "D4".

There should be vacuum.
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If there is no vacuum, go to solenoid valve test I.

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If there is vacuum, the test is complete.

Solenoid Valve Test I: 

NOTE: Apply parking brake securely.

1. Start the engine and allow to idle.

2. Disconnect # 23 vacuum hose from the intake manifold and check for vacuum.

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If there is no vacuum, check the vacuum port.

3. Disconnect the 6P connector.

Symptom Related Diagnostic Procedures|Page 1979 > < Symptom Related Diagnostic Procedures|Page 1977