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DTC P1512: IMRC Shutter Valve Stuck Closed: Testing

NOTE: Record freeze frame data. 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 5 seconds. Allow engine to idle. Recheck DTCs. If DTC P1512 is pending, go to next step. If DTC P1512 is not pending, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
  2. Turn ignition off. Start engine. Accelerate engine to more than 4000 RPM and check IMRC lever operation. If IMRC valve lever is at open position, problem is in monitor circuit. Go to next step. If IMRC valve lever is not at open position, problem is in control circuit. Go to step  8 .
  3. Turn ignition off. Disconnect IMRC actuator connector. Check IMRC actuator and IMRC harness connector terminals. If problem is not present, go to next step. If any problem is present, repair as necessary. Go to step  14 .
  4. Turn ignition on. Check voltage between IMRC harness connector terminal No. 5 (Black/Blue wire) and ground. If 5 volts is present, go to next step. If 5 volts is not present, repair open in wiring between IMRC harness connector terminal No. 5 (Black/Blue wire) and PCM harness connector terminal No. 3 (Red wire). See Figure . See WIRING DIAGRAMS article. Go to step  14 .
  5. Using scan tool, access IMRCMTR PID. Connect fused jumper wire between IMRC harness connector terminals No. 5 (Black/Blue wire) and 6 (Brown/White wire). If PID does not change from on to off, go to next step. If PID changes from on to off, replace IMRC actuator and go to step  14 .
  6. Turn ignition off. Disconnect PCM harness connector. PCM is mounted to passenger floor, behind glove box. Check PCM and PCM harness connector terminals. If problem is not present, go to next step. If any problem is present, repair as necessary. Go to step  14 .
  7. Connect breakout box to PCM harness connector. Leave PCM disconnected. Check continuity between IMRC harness connector terminal No. 6 and breakout box terminal No. 91. See Figure . If continuity is present, go to step  14 . If continuity is not present, repair open in wiring between IMRC harness connector terminal No. 6 and PCM harness connector terminal No. 91. Go to step  14 .
  8. Turn ignition off. Disconnect IMRC actuator connector. Check IMRC actuator and IMRC harness connector terminals. If problem is not present, go to next step. If any problem is present, repair as necessary. Go to step  14 .
  9. Check continuity between IMRC harness connector terminal No. 3 (Black/White wire) and ground. If continuity is present, go to next step. If continuity is not present, repair open in wiring between IMRC harness connector terminal No. 3 (Black/White wire) and ground terminal (Black wire). See WIRING DIAGRAMS article. Go to step  14 .
  10. Turn ignition on. Check voltage between IMRC harness connector terminal No. 2 (Green/White wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open in wiring between IMRC harness connector terminal No. 2 (Green/White wire) and main relay harness connector terminal "D" (Yellow wire). Go to step  14 .
  11. Turn ignition off. Disconnect PCM harness connector. Check PCM and PCM harness connector terminals. If problem is not present, go to next step. If any problem is present, repair as necessary. Go to step  14 .
  12. Connect breakout box to PCM harness connector. Leave PCM disconnected. Check continuity between IMRC harness connector terminal No. 1 (Black/Red wire) and breakout box terminal No. 42. If continuity is present, go to next step. If continuity is not present, repair open in wiring between IMRC harness connector terminal No. 1 and PCM harness connector terminal No. 42 (Black/yellow wire). See Figure . See WIRING DIAGRAMS article. Go to step  14 .
  13. Turn ignition on. Using scan tool simulation function, activate IMRC actuator. If lever is pulled by IMRC actuator cable, go to next step. If lever is not pulled by IMRC actuator cable, replace IMRC actuator. Go to next step.
  14. Reconnect all components. Using scan tool, clear all DTCs. Turn ignition off. Start engine. Accelerate engine to more than 4000 RPM for 5 seconds. Allow engine to idle. Recheck DTCs. If same DTC is pending, replace PCM and go to next step. If same DTC is not pending, go to next step.
  15. Perform after repair procedure. See AFTER REPAIR PROCEDURE  . If DTC is not present, testing is complete. If any DTC is present, go to appropriate test for diagnosis and repair.
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