DTC Troubleshooting: P2004 (178)
DTC P2004:
 IMRC Valve Incorrect Position
NOTE: Before you troubleshoot, record all freeze data and review the general troubleshooting information.
  1. Turn the ignition switch ON (II).
  1. Clear the DTC with the HDS.
  1. Do the IMRC TEST in the INSPECTION MENU with the HDS.
Is the result OK?
YES -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the IMRC solenoid valve, the IMRC position sensor and the ECM.■
NO -
Go to Step 4 .
  1. Turn the ignition switch OFF.
  1. Check for a loose or damaged these IMRC vacuum line:
    • Vacuum pump and IMRC solenoid valve
    • IMRC solenoid valve and IMRC control diaphragm
    • Vacuum pump and brake booster
Is the result OK?
YES -
Go to Step 6 .
NO -
Repair or replace the damaged hoses, then go to Step 14 .
Is the result OK?
YES -
Go to Step 7 .
NO -
  1. Start the engine. Hold the engine speed at 2,000 rpm (min −1 ) without load (in neutral) until the radiator fan comes on, then let it idle.
  1. Clear the DTC with the HDS.
  1. Turn the ignition switch OFF.
  1. Disconnect the vacuum hose (A) from the IMRC solenoid valve (B), and connect a vacuum pump/gauge (C) to the solenoid valve.
  1. Start the engine, and check the vacuum.
Is there vacuum for about 10 seconds?
YES -
Go to Step 12 .
NO -
  1. Reconnect all connectors and vacuum hoses.
  1. Turn the ignition switch ON (II).
  1. Reset the ECM with the HDS.
  1. Start the engine. Hold the engine speed at 2,000 rpm (min −1 ) without load (in neutral) until the radiator fan comes on, then let it idle.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2004 indicated?
YES -
Check for poor connections or loose terminals at the IMRC solenoid valve, the IMRC position sensor, and the ECM, then go to Step 1 .
NO -
Go to Step 18 .
  1. Monitor the OBD STATUS for DTC P2004 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -
Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in Step 17 , go to the indicated DTC's troubleshooting.■
NO -
If the screen indicates FAILED, check for poor connections or loose terminals at the IMRC solenoid valve, the IMRC position sensor, and the ECM, then go to Step 1 . If the screen indicates NOT COMPLETED, go to Step 16 .