Code 19 - Engine off - No Vehicle Power (pins 37 + 57) or bad PCM VPWR Diagnosis. This is a wiring problem
that is from a bad ECC power relay, bad connection, bad fuse link or a bad computer. The ECC relay is located
on top of the computer under the passenger side kick panel. Pull the connector off any fuel injector and measure
the voltage on the red wire: if its 12 volts or better, the ECC relay is OK. If the ECC relay is OK, pull the kick panel
off and measure the voltage at pins 37 & 57. If it is 12 volts or more, then the computer's diagnostic firmware has
taken a dump and is defective.
Remove the passenger side lick panel and disconnect the computer connector.
There is one 10 MM bolt holding it in place.
Pull the connector all the way out of the computer so that you can see the computer side pins.
Use the list from the graphic below to find pins 37 & 57
Diagram courtesy of Tmoss & Stang&2birds