DTC Troubleshooting: U0122 (184)
DTC U0122:
 F-CAN Malfunction (ECM-VSA Modulator-Control Unit)
NOTE: Before you troubleshoot, record all freeze data and review the general troubleshooting information.
  1. Turn the ignition switch ON (II).
  1. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.
Are DTC U0028 and U0122 indicated at the same time?
YES -
Go to troubleshooting DTC U0028. ■
NO -
Go to Step 3 .
  1. Clear the DTC with the HDS.
  1. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.
Is DTC U0122 indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the gauge control module (tach), the VSA modulator-control unit, and the ECM.■
  1. Check for communication to the VSA system.
Does the HDS communicate with the VSA system?
YES -
Go to Step 6 .
NO -
Go to ‘‘DLC Circuit Troubleshooting''.
  1. Turn the ignition switch OFF, and wait 2 minutes.
  1. Disconnect the VSA modulator-control unit 46P connector.
  1. Disconnect ECM connector No. 2 (58P).
  1. Connect ECM connector No. 2 terminal No. 47 to body ground with a jumper wire.