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HOMESERVICE MANUALSHONDA1994PRELUDE VTECREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSEMISSION SYSTEMS & SUB-SYSTEMSFUEL EVAPORATIONEVAP PURGE CONTROL SOLENOID VALVE
1994 Honda Prelude VTEC

EVAP Purge Control Solenoid Valve

1994 Honda Prelude VTECSECTION EVAP Purge Control Solenoid Valve
  1. Disconnect vacuum hose from EVAP purge control diaphragm valve, located on charcoal canister. Connect vacuum gauge to hose. Start and idle engine. Engine coolant temperature must be less than 167°F (75°C).
  2. If vacuum does not exist, go to step 4). If vacuum exists, unplug connector at EVAP purge control solenoid valve. Refer to the EVAP PURGE CONTROL SOLENOID LOCATION  table. Measure voltage between specified wires. See EVAP PURGE CONTROL SOLENOID CONNECTOR IDENTIFICATION  table.
    EVAP PURGE CONTROL SOLENOID LOCATION

    Application Location
    Prelude Near Throttle Position Sensor
    EVAP PURGE CONTROL SOLENOID CONNECTOR IDENTIFICATION

    Application Positive Terminal Negative Terminal
    Prelude Black/Yellow Red/Green
  3. If battery voltage exists, inspect vacuum hose for leaks, blockage and incorrect routing. If hose is okay, replace EVAP purge control solenoid valve. If voltage does not exist, measure voltage between positive terminal and chassis ground. If battery voltage does not exist, repair open circuit in appropriate positive wire. If voltage exists, check for open circuit between negative terminal and ECM. If wire is okay, replace ECM.
  4. Warm engine to full operating temperature (cooling fan comes on). Turn off and restart engine. If vacuum now exists, go to EVAP CANISTER  . If vacuum does not exist, unplug connector at EVAP purge control solenoid valve.
  5. If vacuum now exists, check for short circuit in negative wire between harness connector and ECM. If wire is okay, substitute known good ECM. Retest system. If system now operates properly, replace ECM. If vacuum still does not exist, check vacuum hose for leaks, blockage and improper routing. If hose is okay, replace EVAP purge control solenoid valve.
    NOTE: EVAP canister may also be referred to as charcoal canister or EVAP charcoal canister.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.