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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 test. Check for voltage at EGR control solenoid valve A (Yellow/White wire at emission control box connector.
  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. See COMPONENT TESTING  .
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