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Multi-Ram System Diagnosis (3.0L)

NOTE: Powertrain Control Module (PCM) may also be referred to as Engine Control Module (ECM).
  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. Connect scan tool to Data Link connector (DLC). Retrieve DTCs. If DTCs P1112 or P1113 are not set, go to next step. If DTC P1112 or P1113 is set, perform appropriate diagnostic test. See appropriate SELF-DIAGNOSTICS article.
  3. Visually inspect system. Check for disconnected or damaged vacuum hoses and/or components. Check linkage between vacuum actuators and valves for binding or interference with hoses. Ensure wiring is routed properly and not damaged. If problem does not exist, go to next step. If problem exists, repair as necessary and go to step  14.
  4. Start engine and observe vacuum actuator linkages for switchover valves. Using scan tool, command each valve ON and OFF. If both valves operate, go to next step. If either valve does not operate, go to step  6.
  5. Turn ignition off. Remove duct from between intake resonance switchover valve and throttle body. Hold throttle plates open to view moveable divider in back of intake manifold. Move actuator linkage by hand and ensure divider moves with linkage. Look down passages in intake resonance switchover valve to view moveable divider between 2 sides of valve. Move actuator linkage by hand to ensure divider moves with linkage. If both valves operate properly, system is okay. If either valve does not operate, go to step  13.
  6. Using scan tool, exit device control. Disconnect manifold vacuum supply hose at solenoid valve while observing actuator linkage. If actuator does not move when vacuum is disconnected, go to next step. If actuator moves when vacuum is disconnected, go to step  10.
  7. Check for vacuum at manifold vacuum supply hose. If vacuum exists, go to next step. If vacuum does not exist, go to step  11.
  8. Disconnect other hose from solenoid valve and connect hoses together using suitable vacuum connector. If actuator linkage does not operate, go to next step. If actuator linkage operates, go to step  10.
  9. Disconnect vacuum hose from actuator. If vacuum exists, go to step  13. If vacuum does not exist, go to step  12.
  10. Replace solenoid valve. After repairs, go to step  14.
  11. Repair vacuum supply hose or plugged vacuum source. After repairs, go to step  14.
  12. Repair vacuum hose to actuator. After repairs, go to step  14.
  13. Replace valve/actuator assembly. After repairs, go to next step.
  14. Start engine. Observe vacuum actuator linkages for switchover valves. Using scan tool, command each valve ON and OFF. If both valves operate, system is okay. If either valve does not operate, go to step  2.
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