DTC B2353: Ignition power supply (low input); DTC B2354: Ignition power supply (high input): Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB992006: Extra Fine Probe
• 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 (Vehicles with CAN communication system)

1. STEP 1. Using scan tool MB991958, check data list. 

   Check the ignition power supply voltage.

   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. Check the ETACS data list.
      • Turn the ignition switch to the "ON" position.
        ITEM REFERENCE CHART
        
        

        Item No.	Item name	Normal condition
        Item 254	IG voltage	Approximately 12 volts (battery positive voltage)

        Fig 1: Connecting Special Tool MB991910 To Data Link Connector

        Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   3. Turn the ignition switch to the "LOCK" (OFF) position.

      Q: Do the scan tool MB991958 display the item "IG voltage" is normal condition? 

      1. YES:  Go to Step  4.
      2. NO:  Go to Step 2.
2. STEP 2. Battery check 

   Refer to HOW TO JUDGE THE COMPLETION OF CHARGING .

   Q: Is the battery in good condition? 

   1. YES:  Go to Step 3.
   2. NO:  Charge or replace the battery.
3. STEP 3. Charging system check 

   Refer to OUTPUT CURRENT TEST .

   Q: Is the charging system in good condition? 

   1. YES:  Refer to INSPECTION PROCEDURE 2 "ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE IGNITION SWITCH (IG1)"  .
   2. NO:  Repair or replace the charging system component(s).
4. STEP 4. Recheck for diagnostic trouble. 

   Check again if the DTC is set to the ETACS-ECU.

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

      Q: Is the DTC set? 

      1. YES:  Replace the ETACS-ECU.
      2. NO:  The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).