Hi!
I ha in a Nisan Qashqai J10 an EGR problem.
The DTC in the ECU is P0488.
Checked:
- for shortening of the wiring ( no shortenings )
- for bad contact in the wiring ( no bad contact )
- the resistance of the DC motor in the EGR is around 5-7Ohm ( should be in a good condition )
- The reference voltage to the EGR position sensor is 5V related to GND
- The measured EGR position voltage from the position sensor to the ECU when the EGR valve is closedÂÂ
 position is 0.35V ( a bit low would I say, should be around 0.7-1V or? )
- The measured EGR position voltage from the position sensor to the ECU when the EGR valve is full opened
 position is 4.25V ( sould be correct )
- The DC motor control voltage ws tested with scope too, and the PWM signal is clear and present.
- The EGR valve is nice and shine and moves very good without any kind of noticable problem from closed toÂÂ
  opened position.
 Tested by hand and with powering the motor too.
 Moves very smooth.
The DTC P0488 is still present after clearing too.
Any idea what could cos the problem?
I know the best way would be to EGR off but I'm also interested of the root of the problem.