Tandem Valve Control Solenoid Valve (1.5L TBI)
- Disconnect vacuum hose from tandem valve control diaphragm. Connect vacuum gauge to hose. Start engine, and let idle. Ensure engine coolant temperature is less than 160°F (71°C).
- If vacuum is not present, go to step 3). If vacuum is present, disconnect 2-pin connector from tandem valve control solenoid, and recheck vacuum gauge. See Fig 1
. If vacuum is still present, replace tandem valve control solenoid valve. If vacuum is no longer present, solenoid valve is functioning.
- Raise engine speed to 3000 RPM for M/T and to 2000 for A/T. If vacuum is present, solenoid valve is okay. If vacuum is not present, disconnect 2-pin connector from tandem valve control solenoid valve. Measure voltage between Black/Yellow (positive) wire terminal and Orange (negative) wire terminal with engine speed at 3000 RPM (2000 RPM for A/T). See Fig 1
.
- If battery voltage is not present, solenoid valve is okay. If battery voltage is present, remove solenoid valve from throttle body, and check port for blockage. If port is okay, replace solenoid valve.
Courtesy of AMERICAN HONDA MOTOR CO., INC.