Hi to all,
I need some advice to ascertain if my MAF sensor is gone or not.
The car is a 2005 1.3 multijet 7 seater Doblo.
The car when started will idle fine and reach normal operating temperature good as well.
When driving however, at the lower rpm range its ok, but when you press the pedal
to increase speed it takes forever, and is unlikely to reach 60 mph.
I took off the MAF unit and gave it a good clean, which didn't appear to be too bad at all.
I disconnected the harness from the MAF sensor and took it for a spin......It went
like a bullet!!!
I reconnected the MAF sensor and it returned to its former ways, no power at
the higher rpm range.
I got out the multimeter and checked for the 12volts supply wire, along with the
ground wire location.
This particular MAF sensor has a 5 pin connection. If you were to look at the
5 wire/cable when harness is connected, the first cable on the left I number it no. 1
1 == 5volts supply wire ( for IAT sensor )
2 == 12volts supply wire for MAF sensor.
3 == Ground / Earth.
4 == Signal wire for IAT sensor.
5 == Signal wire for MAF sensor.
These are the arrangements of my use of the multimeter and what I found.
With the engine running and the back probes in place I have the following readings
when engine is at operating temperature.
At idle 1.79 volts
At 3000rpm 2.89 volts.
My question really is, should I have a wider voltage range from idle and 3000rpm.
I don't know if these figures are acceptable or not. My logic is, with more air
entering the engine at higher rpm, more fuel should enter as well. But if the voltage
readings from the MAF sensor are on the low side, the ECU will respond to
the voltage signal............even though the throttle plate is open more to allow more
air into the engine.
Without the MAF sensor connected............................It drives as though I
STOLED IT!!!
Any help would be much appreciated, and if anyone would have some idea of
voltage readings I should be getting would be great.
Just to mention I have no air or vacuum leaks from what
I can see.
Sorry for the long thread.
John.
I need some advice to ascertain if my MAF sensor is gone or not.
The car is a 2005 1.3 multijet 7 seater Doblo.
The car when started will idle fine and reach normal operating temperature good as well.
When driving however, at the lower rpm range its ok, but when you press the pedal
to increase speed it takes forever, and is unlikely to reach 60 mph.
I took off the MAF unit and gave it a good clean, which didn't appear to be too bad at all.
I disconnected the harness from the MAF sensor and took it for a spin......It went
like a bullet!!!
I reconnected the MAF sensor and it returned to its former ways, no power at
the higher rpm range.
I got out the multimeter and checked for the 12volts supply wire, along with the
ground wire location.
This particular MAF sensor has a 5 pin connection. If you were to look at the
5 wire/cable when harness is connected, the first cable on the left I number it no. 1
1 == 5volts supply wire ( for IAT sensor )
2 == 12volts supply wire for MAF sensor.
3 == Ground / Earth.
4 == Signal wire for IAT sensor.
5 == Signal wire for MAF sensor.
These are the arrangements of my use of the multimeter and what I found.
With the engine running and the back probes in place I have the following readings
when engine is at operating temperature.
At idle 1.79 volts
At 3000rpm 2.89 volts.
My question really is, should I have a wider voltage range from idle and 3000rpm.
I don't know if these figures are acceptable or not. My logic is, with more air
entering the engine at higher rpm, more fuel should enter as well. But if the voltage
readings from the MAF sensor are on the low side, the ECU will respond to
the voltage signal............even though the throttle plate is open more to allow more
air into the engine.
Without the MAF sensor connected............................It drives as though I
STOLED IT!!!
Any help would be much appreciated, and if anyone would have some idea of
voltage readings I should be getting would be great.
Just to mention I have no air or vacuum leaks from what
I can see.
Sorry for the long thread.
John.