Accord 1985-86
The idle control solenoid valve is actuated by the on-board computer. When the solenoid valve opens, it lets vacuum into the hose (#26 on 1985 models and top hose on 1986 models) and increases idle speed under the following conditions:
For a short period after starting the engine, whenever the load on the vehicle's on-board network increases (the vacuum will be cut off by the throttle if the engine speed exceeds 1500 rpm). During the opening of the solenoid valve between the black and yellow (+) terminal and green-black (-) terminal, the voltage at the valve must be at least 9 V.
1. Disconnect the wires from the idle air control solenoid valve.
2. Disconnect the vacuum hose (#26 from air pipe on 1985 model and top hose from intake manifold on 1986 model).
3. Force air into hose #26. Air must 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 solenoid valve.
5. Disconnect the #26 vacuum hose from the intake manifold.
6. Pump air into vacuum hose #26. Air must pass through the valve.
Accord 1986 and Prelude 1986-89
The idle control solenoid valve is actuated by the on-board computer. When the solenoid valve opens, vacuum flows into the upper hose of the solenoid valve (from intake manifold) and increases the engine speed under the following conditions:
For a short period after starting the engine, with an increase in the load on the on-board network (the vacuum is turned off by the throttle when the engine speed reaches 1500 rpm)
When opening the valve between the black and yellow terminal (+) and green-black terminal (-) the valve must have a voltage of at least 9 V.
1. Disconnect the wiring harness from the idle air control solenoid valve.
2. Disconnect the upper solenoid valve vacuum hose from the intake manifold.
3. Apply vacuum to the hose. He must be stable. If the vacuum is not being held, 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 solenoid valve.
5. Apply vacuum to the hose. The vacuum must not be held. If the valve is holding vacuum, it should be replaced.