DTC B1870: TSP Manager Error: Diagnosis

Using scan tool (M.U.T.-IIISE), check whether the DTC is set again. 

1. Move the vehicle outside because the scan tool communication becomes poor inside.
   CAUTION: To prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
2. Connect scan tool (M.U.T.-IIISE). Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-IIISE) ."
3. Erase the DTC.
4. Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
5. Check the DTC.

   Q: Is the DTC set? 

   YES:  Replace the TCU (Refer to TCU  ).

   NO:  The trouble can be an intermittent malfunction (Refer to How to use Troubleshooting/inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTION ).