DTC B1867: Connection abnormality, IG: Diagnosis

Required Special Tools 

• MB991223: Wiring harness set
• MB992006: Extra fine probe

1. STEP 1. Voltage measurement at the TCU connector (IG terminal). 
   1. Disconnect the TCU connector, and measure at the wiring harness side.
   2. Turn the ignition switch from OFF position to ON position.
   3. Check the voltage between the TCU connector (IG terminal) and body ground.

      OK: The voltage should measure approximately 12 volts (battery positive voltage). 

      Q: Is the check result normal? 

      YES:  Go to Step  2.

      NO:  Repair the connector(s) or wiring harness.

2. STEP 2. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again. 

   Check again if the DTC is set in the TCU.

   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).
   1. Connect scan tool (M.U.T.-IIISE). Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-IIISE) ."
   2. Erase the DTC.
   3. Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
   4. 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 ).