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DTC P1518: IMRC Shutter Valve Stuck Open: Testing

NOTE: Ensure freeze frame data has been recorded. Check for service bulletins and on-line information.
  1. Using scan tool, clear DTC. Ensure transmission is in Park. Turn ignition off. Start engine. Accelerate engine to more than 4000 RPM for 10 seconds. Allow engine to idle. Recheck DTCs. If DTC P1518 is pending, go to next step. If DTC P1518 is not pending, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
  2. Turn ignition off. Check IMRC valve position. If valve is closed, problem is electrical. Go to next step. If valve is open, problem is valve sticking. Check and repair as necessary. After repair, go to step  9 .
  3. Turn ignition on. Check IMRC valve position. If valve is open, problem is in control circuit. Go to next step. If valve is closed, problem is in monitor circuit. Go to step  6 .
  4. Turn ignition off. Disconnect IMRC actuator connector. Check actuator and connector terminals. If no problem is found, go to next step. If any problem is found, repair as necessary. After repair, go to step  9 .
  5. Check continuity between IMRC harness connector terminal No. 1 (Black/Red wire) and ground. If continuity is not present, go to step  9 . If continuity is present, repair short to ground on circuit. After repair, go to step  9 .
  6. Turn ignition on. Using scan tool, access IMRCMTR PID. Disconnect IMRC harness connector. If PID does not change from on to off, go to next step. If PID changes from on to off, replace actuator and go to step  9 .
  7. Check actuator and connector terminals. If no problem is found, go to next step. If any problem is found, repair as necessary. After repair, go to step  9 .
  8. Turn ignition off. Check continuity between IMRC harness connector terminal No. 5 (Black/Blue wire) and ground. If continuity is present, go to next step. If continuity is not present, repair short to ground on Black/Blue wire between IMRC and PCM terminal No. 3. After repair, go to step  9 .
  9. Reconnect all components. Using scan tool, clear all DTCs. Turn ignition off. Start engine. Accelerate engine to more than 4000 RPM for 10 seconds. Allow engine to idle. Recheck DTCs. If same DTC is pending, replace PCM and go to next step. PCM is mounted to passenger floor, behind glove box. If same DTC is not pending, go to next step.
  10. Perform after repair procedure. See AFTER REPAIR PROCEDURE  . If no DTC is present, testing is complete. If any DTC is present, go to appropriate test for diagnosis and repair.
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