DTC Troubleshooting: U0122
  1. Check for continuity between ECM/PCM connector terminal A4 and VSA modulator-control unit 47P connector terminal No. 13.
Is there continuity?
YES -
Update the VSA modulator-control unit if it does not have the latest software, or substitute a known-good VSA modulator-control unit, then go to Step 12 and recheck. If DTC U0122 is not indicated after substitution, replace the original VSA modulator-control unit, then go to Step 12 .
NO -
Repair open in the wire between the ECM/PCM (A4) and the VSA modulator-control unit, then go to Step 12 .
  1. Reconnect all connectors.
  1. Turn the ignition switch to ON (II).
  1. Reset the ECM/PCM with the HDS.
  1. Do the ECM/PCM idle learn procedure.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC U0122 indicated?
YES -
Check for poor connections or loose terminals at the VSA modulator-control unit and the ECM/PCM, then go to Step 1 .
NO -
Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■