I'm fairly certain the chip or the circuit board/chip assembly is installed backwards.
The signal to start the fuel pump comes from the EMS computer. In the past, same people who changed their eprom chip made the mistake of putting the new chip in backwards and the clue was that the fuel pump wouldn't start afterwards. You might also check that the chip is seated properly and none of the pins were bent.
Caution: Wait 15 Seconds
One thing to be aware of is that you can damage the 1.6M computer if the EPROM is pulled while the unit is still powered up. The 1.6M controls it's own power supply so when you turn off the ignition switch, the ECU stays powered for about 15 seconds while it does some housekeeping. If you try a chip swap without waiting 15 seconds, the ECU will never re-boot properly and sometimes it fries the coil drivers.
|