Accord 1987-89
1. Start the engine.
2. Disconnect the two-pin connector from the idle speed solenoid valve.
3. Connect the positive voltmeter lead to the black/yellow terminal and the negative lead to the green/black terminal.
4. Maintain engine speed at 1500 rpm and check voltage.
5. If there is voltage, check the green-black wire between the solenoid valve and the computer for a short circuit. If the wire is OK, check the on-board computer.
6. If there is no voltage, replace the solenoid valve.