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Signal Response Test

  1. Check that all vacuum lines are properly routed, all connections are secure and that vacuum hoses are not cracked, crimped or broken. Disconnect vacuum line to EGR valve and plug line. Connect vacuum pump to EGR valve. Apply vacuum to valve. Vacuum (6 in. Hg) should bleed off and valve should not operate. If vacuum holds and valve stays open, replace valve.
  2. When engine is cold there should be no vacuum to operate valve. If there is vacuum, check PVS function and replace if necessary. There should be no vacuum to valve at idle under any conditions.
  3. Vacuum should be available at or above part throttle with engine at operating temperature. If vacuum is not available, check PVS function and replace as necessary.
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