DTC Troubleshooting: U1400 (135-2)
DTC U1400:
 F-CAN Malfunction (TCM Received Out of Range Data from ECM)
  1. Turn the ignition switch to ON (II).
  1. Clear the DTCs with the HDS.
  1. Turn the ignition switch to LOCK (0).
  1. Turn the ignition switch to ON (II).
  1. Check for DTCs with the HDS.
Is DTC U1400 indicated?
YES -
Go to Step 6 .
NO -
Intermittent failure, the system is OK at this time.■
  1. Check for Fuel and Emissions systems DTCs with the HDS.
Are any DTCs indicated?
YES -
Go to the Fuel and Emissions systems indicated DTCs troubleshooting.
NO -
Go to Step 7 .
  1. Check these parameters in the DATA LIST with the HDS:
    • ENGINE SPEED
    • ENGINE COOLANT TEMPERATURE
    • INTAKE AIR TEMPERATURE
Is the value 10,001 rpm (min −1 ), 151 °C (304 °F), and 151 °C (304 °F) or more?
YES -
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. ■
NO -
Update the ECM if it does not have the latest software; R18A2 engine model, L13Z1 engine model. If the ECM was updated, substitute a known-good ECM; R18A2 engine model, L13Z1 engine model, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM; R18A2 engine model, L13Z1 engine model. ■