DTC Troubleshooting: U1404 (135-21)
DTC U1404:
 F-CAN Malfunction (TCM Received Out of Range Data from VSA Modulator-Control Unit)
  1. Turn the ignition switch to ON (II).
  1. Clear the DTCs with the HDS.
  1. Test-drive for several minutes.
  1. Check for DTCs with the HDS.
Is DTC U1404 indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, the system is OK at this time.■
  1. Check for VSA system DTCs with the HDS.
Are any VSA system DTCs indicated?
YES -
Go to the VSA system indicated DTC's troubleshooting. ■
NO -
Go to Step 6 .
  1. Test-drive at 10 km/h (6.2 mph) or more.
  1. Check each WHEEL SENSOR in the DATA LIST with the HDS.
Does any of wheel speeds indicate 2,594 rpm?
YES -
Substitute a known-good VSA modulator-control unit, then recheck. If the symptom/indication goes away with a known-good VSA modulator-control unit, replace the original VSA modulator-control unit. ■
NO -
Remove the clutch actuator assembly; R18A2 engine model, L13Z1 engine model, and update the TCM if it does not have the latest software or substitute a known-good TCM, then recheck. If the symptom/indication goes away with a known-good TCM, replace the original TCM; R18A2 engine model, L13Z1 engine model. ■