Component Inspection

Engine Control

P0642 Sensor Reference Voltage 'A' Circuit Low - Component Inspection

Component Inspection

Check sensor
1. IG "OFF" and disconnect A/C Refrigerant Pressure Sensor, Power Steering Pressure Sensor, Fuel Tank Pressure Sensor connector.
2. IG "ON"
3. Check that sensor connector power supply is within the specification after turning IG KEY "ON".
4. Connect A/C Refrigerant Pressure Sensor connector and Fuel Tank Pressure Sensor connector in turn.
5. Measure the voltage of power circuit of each sensor with all connector connected.

Specification : sensor power supply should not change as connecting A/C Refrigerant Pressure Sensor connector and Fuel Tank Pressure Sensor connector
(If the change of sensor power supply occur as connecting sensor connector, this means the occurrence of short inside of sensor.)

6. Does change of sensor power supply occur as connecting sensor connector?