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Boost Control System Check (3.8L - VIN 1)

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. After performing OBD system check, go to next step.
  2. Disconnect boost control solenoid harness connector located at left rear of engine, near valve cover. Turn ignition on. Using a test light connected to ground, probe ignition feed circuit at boost control solenoid harness connector. See appropriate SYSTEM WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step  11.
  3. Connect test light between boost control solenoid harness connector terminals. If test light illuminates, go to step  14. If test light does not illuminate, go to next step.
  4. Connect scan tool to Data Link connector (DLC). Using scan tool, select OUTPUT TESTS, and then BOOST SOL. Observe test light while commanding boost control solenoid output ON using scan tool. If test light illuminates when solenoid output is commanded ON, go to next step. If test light does not illuminate when solenoid output is commanded ON, go to step  16.
  5. Reconnect boost control solenoid harness connector. Disconnect boost vacuum hose between solenoid and by-pass valve actuator located above boost control solenoid. Connect vacuum gauge to boost control solenoid. Place transmission in Park, start engine and allow engine to idle. Observe vacuum gauge reading. If vacuum does not exist, go to next step. If vacuum exists, go to step  17.
  6. Using scan tool, command boost control solenoid OFF. Observe vacuum gauge reading. If vacuum is greater than 15 in. Hg, go to next step. If vacuum is less than 15 in. Hg, go to step  10.
  7. Check for restriction in boost vacuum hose between boost control solenoid and by-pass valve actuator. If restriction does not exist, go to next step. If restriction exists, repair as necessary and go to step  21.
  8. Reconnect boost vacuum hose between boost control solenoid and by-pass valve actuator. Connect vacuum gauge to read inlet vacuum signal to by-pass valve actuator. Place transmission in Park, start engine and allow engine to idle. Observe vacuum gauge reading. If vacuum is greater than 15 in. Hg, see DIAGNOSTIC AIDS . If vacuum is less than 15 in. Hg, go to next step.
  9. Repair restriction in inlet vacuum signal hose to by-pass valve actuator or blocked inlet vacuum source. After repairs, go to step  21.
  10. Check for restriction in vacuum hose to boost control solenoid. If restriction does not exist, go to step  18. If restriction exists, repair as necessary and go to step  21.
  11. Check boost control solenoid ignition feed circuit fuse. If fuse is blown, go to next step. If fuse is okay, go to step  13.
  12. Locate and repair short to ground in ignition feed circuit to boost control solenoid. After repairs, go to step  21.
  13. Locate and repair open in ignition feed circuit to boost control solenoid. After repairs, go to step  21.
  14. Turn ignition off. Disconnect PCM harness connectors. Turn ignition on. Connect test light between boost control solenoid harness connector terminals. If test light illuminates, go to next step. If test light does not illuminate, go to step  20.
  15. Locate and repair short to ground in boost control solenoid control circuit. After repairs, go to step  21.
  16. Turn ignition off. Disconnect PCM harness connector. Turn ignition on. Check boost control solenoid control circuit for an open or short to voltage. If open or short exists, repair as necessary and go to step  21. If open or short does not exist, go to step  19.
  17. Check for poor terminal connections at boost control solenoid. If problem does not exist, go to next step. If problem exists, repair as necessary and go to step  21.
  18. Replace boost control solenoid. After repairs, go to step  21.
  19. Check boost control solenoid control circuit for a poor terminal connection at PCM. If problem does not exist, go to next step. If problem exists, repair as necessary and go to step  21.
  20. Replace PCM. Program replacement PCM using required equipment. After repairs, go to next step.
  21. Disconnect inlet vacuum signal hose from by-pass valve actuator. Start engine and allow engine to idle. Using scan tool, select OUTPUT TESTS, and then BOOST SOL. Observe MAP sensor reading on scan tool while cycling boost control solenoid ON and OFF. If MAP sensor value decreases while boost control solenoid is commanded ON, and increases while boost solenoid is commanded OFF, system is operating properly. Reconnect inlet vacuum signal hose to by-pass valve actuator. If MAP sensor value is not as specified, go to step  2.
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