Summary of Contents for Honda Civic 1986 1987 Service Manual - Page 54

  • Honda Civic 1986 1987 Service Manual - Page 54

    Solenoid Valves r-ldle Control Solenoid Valve [Exam KX modeli The idle control solenoid valve is activated by commands from the ECU. When the solenoid valve opens, this causes vacuum in the vacuum hose #73 (between the throttle body and the solenoid valve) end increase idle speed approximately Isa min (rpm) under the fol- lowing conditions: 0 For a short period after starting the engine. Altitude higher than 800 m. Coolant! temperature lower man 70°C (158°Fi. For 0.5 seconds when quick deceleration is detected at 1,000 min‘I (romi While the solenoid valve is energized, 9V or higher should be available between the Yellow/Black terminal (+) and Green/Black terminal l—) of the main names: at the control box. 1. Disconnect the 4 cavity rectangular connector lvom the control box, 2. Disconnect the vncuum hose #20 trom the throttle body. 3, Apply vacuum to the hose #20. it should hold vacuum. VACUUM PUMF/ 0 If it does not hold vacuum, replace the valve. 4. Connect the battery positive terminal and negative terminal to the terminals of the control box con- hector. 5. Apply vacuum to hose #20. it should not hold vacuum. 0 If it holds Vacuum, replace the valve. [KX model] The idle control solenoid valve is activated by commands from the ECU. When the solenoid Valvo opens, this causes vacuum in the vacuum hose (between the air filter and the solenoid valve) and increase idle speed under the following conditions: a For a short poriod after starting the engine, 0 Whenever electrical loads are turned ON (vacuum will disappear when engine speed is raised over 1,700 min“ (rpm) by operating the throttle). While the solenoid valve is being activated, 9v or higher should be available between the Green/White terminal (+l and Black/Yellow terminal (—l or the main harness at the control box. l. Disconnect the B cavity rectangular connector from the control box. 2. Disconnect the vacuum hose #10 from the intake manifold. 3. Apply vacuum to the hose #10, it should hold vacuum. HOSE #10 VACUUM PUMP] - If it does not hold vacuum, replace the valve, 4. Connect the battery positive terminal and negative terminal to the terminals oi the control box con- nector. 5. Apply vacuum to hose #10, it should not hold Vacuum. 0 if it holds vacuum, replace the valve. 11-32