fiesta idle probs
Discussion
1.1 CFI unit L reg.
My head hurts ive tried everything i can on this problem. Idle speed is really low and engine cuts out from cold but just manages to hang on when hot. There doesnt appar to be any "choke" operating.
I invested in a halfords diagnosic reader and it comes up with "throttle plate control motor". which i believe to be correct as the DC motor never appears to move or do anything.
I replaced the "throttle plate control motor" with one from a breakers yard but i get exactly the same problem and diagnostic reading.
I then checked for wiring faults by digging a pin in the wires and got voltages on all of the four pins (3v in one and 1.7v in the others including earth !?).
I wonder if anyone knows what the problem might be or can give me details on corect voltages etc
Thanks
My head hurts ive tried everything i can on this problem. Idle speed is really low and engine cuts out from cold but just manages to hang on when hot. There doesnt appar to be any "choke" operating.
I invested in a halfords diagnosic reader and it comes up with "throttle plate control motor". which i believe to be correct as the DC motor never appears to move or do anything.
I replaced the "throttle plate control motor" with one from a breakers yard but i get exactly the same problem and diagnostic reading.
I then checked for wiring faults by digging a pin in the wires and got voltages on all of the four pins (3v in one and 1.7v in the others including earth !?).
I wonder if anyone knows what the problem might be or can give me details on corect voltages etc
Thanks
More likely to be a corrupt reading from the Engine Coolant Temp sensor.
they were the most common thing to cause this fault.
As for the Dc motor, does the throttle pedal move when the ignition is turned off and on when the engine been run up to temp?
might also be worth sticking your multimeter in the Throttle position sensor and checking for out of spec resistances.
they were the most common thing to cause this fault.
As for the Dc motor, does the throttle pedal move when the ignition is turned off and on when the engine been run up to temp?
might also be worth sticking your multimeter in the Throttle position sensor and checking for out of spec resistances.
Thanks ever so much for your advice.
I fitted another throttle position sensor (from breakers)on the offchance but no change in the fault.
I will try to check the coolant temp sensor this week, but it had not shown up as an error on my diagnostic fault finder.
The DC motor/throttle pedal does not move at-all when the ignition is turned off or when up to temp. In fact the Dc motor does not move ever.
I checked the supply voltage at idle to the Dc motor pin and its only 3V. Would 3V be enough to work it ? I suspect it requires 5V or 12V supply but ive no idea why the voltage would be low.
I fitted another throttle position sensor (from breakers)on the offchance but no change in the fault.
I will try to check the coolant temp sensor this week, but it had not shown up as an error on my diagnostic fault finder.
The DC motor/throttle pedal does not move at-all when the ignition is turned off or when up to temp. In fact the Dc motor does not move ever.
I checked the supply voltage at idle to the Dc motor pin and its only 3V. Would 3V be enough to work it ? I suspect it requires 5V or 12V supply but ive no idea why the voltage would be low.
The ect never used to throw up a fault code because it was never really faulty.
it had a nasty habit of lying to the PCM,
quite often used to tell the module it was either hotter or colder than it really was, which had a detrimental effect on the fuelling.
Top of my head m8, i can't remember what the voltages were, but i'll check some bits and bobs tomorrow for you
there were loads of TSB's released fpr running issues on the CFi vehicles
it had a nasty habit of lying to the PCM,
quite often used to tell the module it was either hotter or colder than it really was, which had a detrimental effect on the fuelling.
Top of my head m8, i can't remember what the voltages were, but i'll check some bits and bobs tomorrow for you
there were loads of TSB's released fpr running issues on the CFi vehicles
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