Summary of Contents for Honda Civic 1986 1987 Service Manual - Page 74

  • Honda Civic 1986 1987 Service Manual - Page 74

    Emission Controls —lgnition Timing Control [KX model only] Cold Advance Solenoid Valve The cold advance solenoid valve is activated by com- 4. Connect the battery positive and negative terminals mands from the ECU. When the solenoid valve opens, to {hammer box common (his eauses vacuum in the #5 vacuum hose and sends vacuum (a Diaphragm a to improve cold engine per- 5, Appryvawummm, hose #12, formance under the lollowing conditions: it show, no. hold vacuum 0 Whenever the coolant temperature is below 60°C (150°Fl. 0 When the coolant temperature is eo—loo°c [1607 212°Fl4 it is operated by the control unit which receives signals from the engine speed and manifold vacuum. When the valve is open, 9V or more should be available between the Green/Black terminal (+) and White tern minal (—l of the main harness at the control box. 1. Disconnect the a cavity rectangular connector from the control box. 2. Disconnect the vacuum hose #12 from the vacuum tank. 3‘ Apply vacuum to the hose #12 It should hold vacuum, 0 If it holds Vacuum, replace the valve. VACUUM PUMP) GAUGE D If it does not hold vacuum, replace the Velvet 11-50