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SVT Shelby GT500
Retrofitting '13/'14 GT500 Bilstein Damp-Tronic's to any '07-'12 GT500
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<blockquote data-quote="PRP" data-source="post: 13090461" data-attributes="member: 97061"><p>Tob,</p><p></p><p>My best bet is that the PCM supplies a signal to the shock when put into "Sport Mode" and that one of the electronic/electric terminals is power with the other being ground. And my thinking is that the PCM doesn't supply ANY signal when in "Comfort" mode (basically, goes into 'default' mode).</p><p></p><p>The *easiest* way to check what the PCM does is with a 10M ohm minimum impedance Digital Volt Ohm Meter (any *GOOD* DVOM will suffice), set to DC Volts, connected to the wiring harness plug for a shock/strut and then toggle between Sport/Comfort mode.</p><p></p><p>It is *rare* that a PCM supplies a full 12v to a output device but there are a couple of exceptions (Fuel pump, FP relay, power up relay, etc.). Most of the time, 12v is supplied to the output via a fused circuit and the PCM supplies the ground (-) for it (injectors, for example). That is because the transistor used to switch it on/off is only able to handle a low level of current (1.75a, If I recall correctly). The output device provides a voltage drop and allows the PCM to control it without frying the diode/transistor (semi-conductor) because the voltage drop reduces the current flow (amps) in the circuit.</p><p></p><p>*Typically* the PCM supplies a 5v reference signal but that is on input devices. Some older Fords had a 9v reference voltage but they gave that up when they figured out a car would still run on <9v and the ECM was still trying to operate, hence the univeraally accepted 5v reference voltage signal.</p><p></p><p>Be very careful if you're going to probe someone's PCM harness. DO NOT use a 12v test lamp on it because they do not provide enough resistence and you WILL kill a PCM with one. A "Noid" light will work fine though.</p><p></p><p></p><p>I'm interested in seeing what you find out,</p><p></p><p>Phill</p></blockquote><p></p>
[QUOTE="PRP, post: 13090461, member: 97061"] Tob, My best bet is that the PCM supplies a signal to the shock when put into "Sport Mode" and that one of the electronic/electric terminals is power with the other being ground. And my thinking is that the PCM doesn't supply ANY signal when in "Comfort" mode (basically, goes into 'default' mode). The *easiest* way to check what the PCM does is with a 10M ohm minimum impedance Digital Volt Ohm Meter (any *GOOD* DVOM will suffice), set to DC Volts, connected to the wiring harness plug for a shock/strut and then toggle between Sport/Comfort mode. It is *rare* that a PCM supplies a full 12v to a output device but there are a couple of exceptions (Fuel pump, FP relay, power up relay, etc.). Most of the time, 12v is supplied to the output via a fused circuit and the PCM supplies the ground (-) for it (injectors, for example). That is because the transistor used to switch it on/off is only able to handle a low level of current (1.75a, If I recall correctly). The output device provides a voltage drop and allows the PCM to control it without frying the diode/transistor (semi-conductor) because the voltage drop reduces the current flow (amps) in the circuit. *Typically* the PCM supplies a 5v reference signal but that is on input devices. Some older Fords had a 9v reference voltage but they gave that up when they figured out a car would still run on <9v and the ECM was still trying to operate, hence the univeraally accepted 5v reference voltage signal. Be very careful if you're going to probe someone's PCM harness. DO NOT use a 12v test lamp on it because they do not provide enough resistence and you WILL kill a PCM with one. A "Noid" light will work fine though. I'm interested in seeing what you find out, Phill [/QUOTE]
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SVT Shelby GT500
Retrofitting '13/'14 GT500 Bilstein Damp-Tronic's to any '07-'12 GT500
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