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Old 04-05-2014, 07:23 PM   #6
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 41,029
 

2003 L-Series 3.0L Sedan
Default Re: Throttle Position Relearn

At ignition ON time, all electronics go thru their power-on self tests then the throttle is preset to an initial opening based on temperatures for rich, normal, lean fuel mixtures. Ignore this throttle setting. The 30 second delay without pressing the pedal is detected by the ecm to invoke the throttle calibration routine. The most important observation of all this is that you can't move throttle when pressing pedal; this is strictly a master/slave relationship of drive-by-wire systems - pressing pedal is supposed to result in throttle plate opening in direct proportion. Its presumed ignition is ON as powering off turns off electronics.

Cleaning electric/electronic throttles that are not completely sealed from solvents may cause problems if solvent works its way inside and causes electrical problems. Solvent that conducts electricity may temporarily short out circuitry and cause more problems. Service manuals caution against excessive solvent use. While its said that there are no serviceable parts inside, taking on any task to disassemble and examine/clean/repair anything in these throttles also carries another risk; electronically controlled throttles are precision devices requiring caution in handling as the repercussions can't be explained with a worse case scenario of a botched disassembly/examination/cleaning/repair - an uncontrolled engine.

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