Accord 1985-86
The idle air control solenoid is actuated by the on-board computer. When the solenoid opens, it allows vacuum to flow into the hose (#26 on 1985 models and the upper hose on 1986 models) and increases the idle speed under the following conditions:
For a short period after starting the engine, whenever the load on the vehicle's electrical system increases (the vacuum will be cut off by the throttle if the engine speed exceeds 1500 rpm). When the solenoid valve opens between the black-yellow (+) terminal and the green-black (-) terminal, the voltage on the valve should be at least 9 V.
1. Disconnect the wires from the idle air control solenoid valve.
2. Disconnect the vacuum hose (#26 from the air intake pipe on 1985 model and the upper hose from the intake manifold on 1986 model).
3. Pump air into hose #26. Air should not pass through the valve.
4. Connect the positive battery terminal to the black/yellow terminal of the solenoid valve and the negative terminal to the green/black terminal of the valve.
5. Disconnect vacuum hose #26 from the intake manifold.
6. Pump air into vacuum hose #26. Air should pass through the valve.
Accord 1986 and Prelude 1986-89
The idle speed control solenoid valve is actuated by the on-board computer. When the solenoid valve opens, vacuum is applied to the upper solenoid hose (from the intake manifold) and increases engine speed under the following conditions:
For a short period after starting the engine, when the load on the on-board network increases (the vacuum is switched off by the throttle when the engine shaft speed reaches 1500 rpm)
When the valve is opened, there should be at least 9 V between the black/yellow terminal (+) and the green/black terminal (-) on the valve.
1. Disconnect the wiring harness from the idle air control solenoid valve.
2. Disconnect the upper solenoid vacuum hose from the intake manifold.
3. Apply vacuum to the hose. It should be stable. If the vacuum does not hold, replace the valve.
4. Connect the positive battery terminal to the black/yellow terminal of the solenoid valve and the negative terminal to the green/black terminal of the valve.
5. Apply vacuum to the hose. The vacuum should not hold. If the valve holds vacuum, it should be replaced.
Publication reprinted from the website: www.HondaBook.ru