GM Fuel Pump control scheme

[WEG1192 at aol.com]

Jake,

>From a sophomore's viewpoint, limp home mode is when the ECM's digital 
circuitry crashes. There are removable resistors (CALPAK) in the ECM that can 
run the injectors in "analog mode" based on just a few basic sensors like 
TPS, coolant, RPM, and maybe MAP. Of course the engine runs way out of tune 
since this is an emergency situation. The ignition module takes over ignition 
timing with its own internal curve. The fuel pump is also apparently under 
control of the limp home circuitry at all times. This is my short version. JW
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