DTC C1900: No registration: Diagnosis

Required Special Tools: 

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
  • MB991824: Vehicle Communication Interface (V.C.I.)
  • MB991827: M.U.T.-III USB Cable
  • MB991910: M.U.T.-III Main Harness A

1. STEP 1. M.U.T.-III CAN bus diagnostics 

   Use scan tool to diagnose the CAN bus lines.

   Q: Is the check result normal? 

   1. YES:  Go to Step 2.
   2. NO:  Repair the CAN bus lines (Refer to CAN BUS DIAGNOSTICS TABLE ). On completion, go to Step 2.
2. STEP 2. Diagnostic trouble code check 
   1. Turn the ignition switch to the "LOCK" (OFF) position.
   2. Turn the ignition switch to the "ON" position.
   3. Check if the DTC is set.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the DTC C1900 set? 

   1. YES:  Register the ID codes (Refer to ID CODES REGISTRATION PROCEDURES  ). Then go to Step 3.
   2. NO:  The procedure is complete.
3. STEP 3. Recheck for diagnostic trouble code. 

   Check again if the DTC is set.

   1. Turn the ignition switch to the "LOCK" (OFF) position.
   2. Turn the ignition switch to the "ON" position.
   3. Check if the DTC is set.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the DTC C1900 reset? 

   1. YES:  Replace the KOS-ECU and register the ID codes (Refer to ID registration procedure manual - ID codes registration judgement table). Then start over at  Step 1.
   2. NO:  The procedure is complete.