DTC U0151: SRS-ECU CAN timeout: Diagnosis

Required Special Tools: 

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

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line. 
   CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
   1. Connect scan tool MB991958. Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)  ."
   2. Turn the ignition switch to the "ON" position.
   3. Diagnose the CAN bus line.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the CAN bus line found to be normal? 

   • YES:  Go to Step 2.
   • NO:  Repair the CAN bus line (Refer to DIAGNOSIS ).
     Fig 1: Connecting Special Tool MB991910 To Data Link Connector

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. STEP 2. Using scan tool MB991958, read the SRS-ECU diagnostic trouble code. 

   Check again if the DTC is stored in the SRS-ECU.

   Q: Is the DTC stored? 

   • YES:  Diagnose the SRS-ECU. Then Go to  Step 4.
   • NO:  Go to Step 3.
3. STEP 3. Using scan tool MB991958, read diagnostic trouble code No. U0151 for other system. 

   Check if DTC U0151 is stored in ETACS-ECU, combination meter, A/C-ECU, KOS-ECU or WCM, hands free module, CAN box unit, radio and CD player, satellite radio tuner.

   Q: Is the DTC stored? 

   • YES:  Replace the SRS-ECU (Refer to SRS CONTROL UNIT (SRS-ECU)  ).
   • NO:  Go to Step 4.
4. STEP 4. Recheck for diagnostic trouble code. 

   Check again if the DTC is stored in the occupant classification-ECU.

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

   Q: Is the DTC stored? 

   • YES:  Replace the front seat cushion frame (RH) (Refer to DISASSEMBLY AND ASSEMBLY ) < Except RALLIART > or replace the slide adjuster (RH) (Refer to DISASSEMBLY AND ASSEMBLY ) < RALLIART >.
   • NO:  There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).