Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
164
18.
DTC
P0642 Sensor supply voltage 1 is too low.
P0643
Sensor supply voltage 1 is too high.
P0652
Sensor supply voltage 2 is too low.
P0653 Sensor supply voltage 2 is too high.
Fault Description: Due to the nature of sensor, some sensors require a voltage to finish the required function and
operation. The supply voltage of sensor is supplied by ECU. The ECU shall calculate the required voltage of sensor
according to its characteristic and supply the voltage to the sensor via control circuit. In the process of voltage
signaling, DTCs may occur due to virtual connection or poor connection of control circuit, etc.
Sensor supply voltage 1: The power supply for accelerator pedal 1 and CMP sensor
Sensor supply voltage 2: The power supply for accelerator pedal 2, absolute pressure sensor and common rail
pressure sensor.
Diagnosis Hint: Check the ECU power voltage for any fault. The power voltage detected by multimeter should
generally be 5V. Check the voltage signal supplied to relevant sensor. The fault may be caused by virtual connection,
poor contact of wire, abrasion of insulation or damage of the wire in insulation. Check the circuit for the following
conditions:
– Loose terminal
– Poor matching and connection
– Breakage of keeper
– Distortion or damage of terminal
– Poor contact between terminal and wire
– Damage of harness – Check the harness for any damage
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