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Old 11-17-2012, 03:10 AM
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Is this normal ?

2001 Ex - 230.000 K's, jumps from 750 rpm - 1000 rpm after two minutes.
Even when the EOT reads pretty decent temperature, it still revs up
I've noticed that plp have asked about this before and the replay was - its normal. Is it normal and what sensor(s) are used by the PCM to set the idle?

Have also noticed that the ECT sensor are dead - 0 volt output and a crazy misreading of temperature, funny thing are the dash meter readings are normal. Where does the temp meter get its info - EOT?
How important is it, PCM wice - to have a correct functional ECT sensor?

APS - gives only 78% at WOT. Any way of adjusting the sensor or do I have to replace?.

Helge
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Old 11-25-2012, 04:03 AM
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and heres the answers..

2001 Ex - 230.000 K's, jumps from 750 rpm - 1000 rpm after two minutes.
Even when the EOT reads pretty decent temperature, it still revs up
I've noticed that plp have asked about this before and the replay was - its normal. Is it normal and what sensor(s) are used by the PCM to set the idle?

The RPM comes up during idle for the sake of emissions. Parking a diesel at low idle will allow it to get cool enought to start smoking and stinking,,, not a desired result. There is no single sensor, the PCM has a program in it for proper operation... think of it as a diesel engine app. The multitude of sensors on the truck tell the PCM what is going on with the engine, and the PCM decides how to adjust all the controls on the engine. You already know you have an Accelerator Position Sensor (Ford calls it a Throttle Position Sensor, or TPS), but what you may not know is that it is not a direct contol... it is merely an input from the driver and the PCM decides what best to do with this input, based on all the other sensor readings and the program.

Have also noticed that the ECT sensor are dead - 0 volt output and a crazy misreading of temperature, funny thing are the dash meter readings are normal. Where does the temp meter get its info - EOT?
How important is it, PCM wise - to have a correct functional ECT sensor?

Yup, Engine Coolant Temperature is a real Larry the Liar: It will read some absurd figure like 300 degrees(F), then drop down and start reading more sensible numbers, but they will be lower than the EOT by quite a bit.

APS - gives only 78% at WOT. Any way of adjusting the sensor or do I have to replace the whole unit?

Mine reads 3.85 volts when I bury the foot pedal, some read 4.5, some read almost anything in between... but I haven't seen any of them go to 5V yet. This is normal and another reason why the PCM doesn't take direct orders from the throttle: If the TPS controlled the throttle directly, you wouldn't get up to full throttle. As things work, you are getting to full throttle with the lower TPS max voltage. You don't need one of those.

Last edited by helgaairhead; 11-25-2012 at 04:04 AM. Reason: Very bad Norwegian spelling.......
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