What does the ECM consist of?

[gordyzx9r]

What else makes up the ECM, and what does it do?

ECM
Calpak?
Eprom?
Chip?

[Recklessrob]

The Eprom is the chip. There is a whole bunch of other stuff in there too.
Why do you ask ?
 :psix;

[87natty]

The actual ECM is the main body. Calpak is the limp home mode that the car goes into when sensors fail. All the wires going into the ecm are the main engine sensors, like you TPS, IAC, MAF, etc. All of your gauges are not at all related to the ECM, which is why you have 3 coolant sensors. 2 for the computer and 1 for the idiot light. Your MAT sensor is used for boost gauge.

So your whole system consists of the sensors, the harness they're atttached to and then your ECU case. Within that case you have your E-PROM (erasable - programmable read-only memory) what normal people call a chip. And as you know these are interchangable .