DTC Troubleshooting: U0122
  1. Check for continuity between ECM connector terminal A4 and VSA modulator-control unit 46P connector terminal No. 38.
Is there continuity?
YES -
Substitute a known-good VSA modulator-control unit, then go to Step 12 and recheck. If DTC U0122 is not indicated, replace the original VSA modulator-control unit, then go to Step 12 .
NO -
Repair open in the wire between the ECM (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 with the HDS.
  1. Do the ECM 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 gauge control module (tach), the VSA modulator-control unit, and the ECM, 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.■