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DTC P1520: IMRC Drive Circuit Malfunction: 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 P1520 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. 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  8 .
  3. 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 on Green/White wire or Green/Blue wire between IMRC and main relay. After repair, go to step  8 .
  4. Check continuity between IMRC harness connector terminal No. 1 (Black/Red wire) and ground. If continuity is not present, go to next step. If continuity is present, repair short to ground on circuit. After repair, go to step  8 .
  5. Disconnect PCM connector. PCM is mounted to passenger floor, behind glove box. Check PCM 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  8 .
  6. Connect breakout box to PCM 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 circuit as necessary. After repair, go to next step.
  7. Turn ignition on. Using scan tool simulation function, activate IMRC actuator. If lever is pulled by cable, go to next step. If lever is not pulled, replace IMRC actuator. After repair, go to next step.
  8. 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. If same DTC is not pending, go to next step.
  9. 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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