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Cold Engine

NOTE: Engine coolant temperature must be below thermosensor set temperature; thermosensor must have continuity.
  1. Disconnect vacuum hose from EGR valve and connect vacuum gauge to hose. Start engine and raise engine speed to 4500-5000 RPM. Vacuum should not be available.
  2. If vacuum is not available, proceed with HOT ENGINE  . If the gauge shows vacuum is available, check for voltage at EGR control solenoid valve A (Blue/Yellow wire at emission control box connector on Accord).
  3. If there is voltage, replace EGR control solenoid valve A and retest. If there is no voltage, check thermosensor operation, wiring, fuses and retest.
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