Code No. P0643: Analog Sensor Reference Voltage No. 1 Too High
FUNCTION
- The engine-ECU applies 5 V to 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
- The detected voltage of analogue sensor reference voltage No. 1 is 5.14 V or more. [Power
supply for 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 |
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Q.
Is the diagnosis code stored?
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Replace the engine-ECU. |
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Intermittent malfunction (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points -
How to Cope with Intermittent Malfunctions ). |
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