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Test NTC-5: Checking Engine Vacuum

NOTE: For circuit identification, see WIRING DIAGRAMS article. After each repair procedure has been completed, reconnect all components. Perform TEST VER-2  to ensure system is functioning properly. Ensure no DTCs are present before performing this test.
  1. Connect vacuum gauge to a manifold engine vacuum source. Start engine and allow to idle. Note engine vacuum reading. Turn engine off.
  2. Engine vacuum should be steady and 13-22 in. Hg. Vacuum will vary depending on altitude. If engine vacuum is not within specification, perform TEST NTC-4: CHECKING ENGINE MECHANICAL SYSTEMS . If engine vacuum is within specification, engine vacuum is normal. Test is complete.
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