Power Valve Control Solenoid Valve
- Disconnect solenoid valve No. 14 vacuum hose from vacuum hose manifold and connect a hand-held vacuum gauge. See Fig 1
. Start engine. If vacuum is present, turn ignition off and go to next step. If vacuum is not present, go to step 4).
- Disconnect 4-pin connector near solenoid valve. Start engine. Measure voltage between Green/Yellow (positive) terminal and Black (negative) terminal on wire harness. See Fig 1
. If battery voltage is present, replace solenoid valve. If battery voltage is not present, measure voltage between Green/Yellow (positive) terminal and body ground.
- If battery voltage is present, repair open or short in Black wire between solenoid valve and ground. If battery voltage is not present, check CHECK ENGINE light and self-diagnosis indicator. If okay, check for open or short in Green/Yellow wire between control box and control unit.
- Warm engine to normal operating temperature (cooling fan comes on). Check vacuum gauge. If vacuum is present, solenoid valve is okay. If vacuum is not present, turn ignition off. Disconnect 4-pin connector near solenoid valve. See Fig 1
Start engine. Measure voltage between Green/Yellow (positive) terminal and Black (negative) terminal on wire harness.
- If battery voltage is present, replace solenoid valve. If battery voltage is not present, check CHECK ENGINE light and self-diagnosis LED indicator. If voltage is present, substitute a known good control unit and retest. If symptom goes away, replace original control unit.
Courtesy of AMERICAN HONDA MOTOR CO., INC.