Code No. P0653: Analog Sensor Reference Voltage No. 2 Too High


OPERATION



  • The engine-ECU (terminal No. 80) supplies 5 V power to the terminal of each sensor [except the accelerator pedal position sensor (main)].

FUNCTION



  • The engine-ECU applies 5 V to the sensors other than the accelerator pedal position sensor (main).
  • The engine-ECU checks whether the supply voltage is within the specified range.

TROUBLE JUDGMENT


Check Conditions
  • Battery positive voltage is 8 - 16 V
  • 2 seconds later after the ignition switch has been in "ON" position or the engine has started up
Judgment Criterion
  • The detected voltage of analog sensor reference voltage No. 2 is 5.14 V or more for 0.5 second. [Power supply for other than accelerator pedal position sensor (main)]

PROBABLE CAUSE



  • Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

  • After erasing the diagnosis code through M.U.T.-III, ignition switch is "ON" position and confirm whether the diagnosis code is output.

Q. Is the diagnosis code set?
Replace the engine-ECU. When the engine-ECU is replaced, write the chassis number (Refer to GROUP 00 - How to Perform Chassis Number Writing ). After replacing the engine-ECU, register the injector identification code and learn fuel injection (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ).
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).