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306 HDi fault throttle fault
MiserlyMartin
Posts: 2,259 Forumite
Long story short. Car has engine management light on. Code reader says throttle position sensor 2 fail. Cleared off but it comes back. The car revs up and down by itself in idle and when you are driving it off from standstill at times you put your foot down it effectively takes the thottle off instead, slowing you down to a crawl! New TPS from Peugeot is £120!'
I did some voltage tests on the TPS. All measured with respect to the battery GND
Red 5v (wire 1391) permanent no matter of the pot position
White (wire 1377) 0.48v No throttle, 3.77v full throttle
Yellow (wire 1378) 0.25v No throttle, 1.90v full throttle
Green (wire 1392) 0v no matter of the pot position, probably this is the circuit GND
I moved the TPS wheel very slowly from rest to full on and back again, and watched the voltage move each time, there were no jumps or any indication of a bad potentiometer - so I think that the TPS is ok and it must be something else??? But what ? I tried unplugging the Mass air flow sensor, no difference. I read the EGR valve may effect this but I have also read equally that is has no effect on the throttle too.
Can anyone suggest the next thing to try please?
I did some voltage tests on the TPS. All measured with respect to the battery GND
Red 5v (wire 1391) permanent no matter of the pot position
White (wire 1377) 0.48v No throttle, 3.77v full throttle
Yellow (wire 1378) 0.25v No throttle, 1.90v full throttle
Green (wire 1392) 0v no matter of the pot position, probably this is the circuit GND
I moved the TPS wheel very slowly from rest to full on and back again, and watched the voltage move each time, there were no jumps or any indication of a bad potentiometer - so I think that the TPS is ok and it must be something else??? But what ? I tried unplugging the Mass air flow sensor, no difference. I read the EGR valve may effect this but I have also read equally that is has no effect on the throttle too.
Can anyone suggest the next thing to try please?
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