DTC Troubleshooting: U0408 (207)
DTC U0408:
 ISV Actuator Control Module Problem
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. Check for Temporary DTCs or DTCs with the HDS.
Is DTC U0408 indicated?
YES -
Go to Step 4 .
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the intake shutter valve and the ECM.■
  1. Turn the ignition switch OFF.
  1. Replace the intake shutter valve.
  1. Turn the ignition switch ON (II).
  1. Reset the ECM with the HDS.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC U0408 indicated?
YES -
Check for poor connections or loose terminals at the intake shutter valve and the ECM, then go to Step 1 .
NO -
Troubleshoot is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■