Code No. P0652: Analog Sensor Reference Voltage No. 2 Too Low

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 analogue sensor reference voltage No. 2 is 4.86 V or less. [Power supply for other than accelerator pedal position sensor (main)]

FAIL-SAFE AND BACKUP FUNCTION

The accelerator pedal opening is controlled to be 0 %.
The idle speed is 1,300 r/min.
The DPF regeneration is prohibited.
The EGR control is stopped (fully closed).
The throttle valve is opened (Electrical discontinuity).
The AS&G control is prohibited.

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 set.

Q. Is the diagnosis code set?

	Replace the engine-ECU.

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).