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DTC No. P1AA1-49 DCDC converter sensor failure
 
 
 
 
 
 
TROUBLE JUDGMENT
Check condition1
  • All the time during operation
Check condition2
  • After the power supply mode of the electric motor switch is changed to ON, the electric motor switch is operated to change the power supply mode to OFF then ON.
Judgment Criterion1
  • All of the following conditions are met.
    • The AD conversion malfunction is detected.
    • The malfunction of the sensor inside the DC-DC converter is detected.
Judgment Criterion2
  • The zero point malfunction of the input current in the high voltage system is detected.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the On Board Charger (OBC)/DC-DC converter
 
 
DIAGNOSIS
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
1.Check whether the DTC is set again.
(1) Erase the set DTC.
(2) Change the power supply mode of the electric motor switch to ON (READY indicator: ON).
(3) Change the power supply mode of the electric motor switch to OFF, then wait for 2 minutes or more in key lock condition. (Check that the P indicator on the selector lever turns off.)
(4) Change the power supply mode of the electric motor switch to ON (READY indicator: OFF).
(5) Check whether the DTC is set again.
Is the DTC set?
Repalce the On Board Charger (OBC)/DC-DC converter (Refer to ON BOARD CHARGER (OBC) &DC-DC CONVERTER REMOVAL AND INSTALLATION).
The trouble can be an intermittent malfunction (Refer to General Information - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunctions HOW TO COPE WITH INTERMITTENT MALFUNCTIONS).