Maverick H1L

iTrader: (8)

The only way you could test the PROM is by getting your hands on either a spare MEMCAL (which I would advise) or a Moates BURN2. The PROM is most likely fried if it was just floating around inside the ECM when received. It's highly probable you installed it backwards and power got to the wrong pins of the chip, killing it within milliseconds.

The ECM decides the starting fuel pulses based on something like 3 different tables... Fuel pulse duration vs coolant and air temp, duration vs batt volts, duration vs TPS position. This is called "Start Mode". Your problem is occuring when the ECM switches to "Run Mode" at 400 RPM and looks for the MAF as an input as it controls the F/I pulse and the spark timing. Don't start pointing fingers at the MAF yet... Worry about the MEMCAL first.

You will want to look for the following "Morse" codes: 4-1 (Bad MEMCAL, cylinder select error), 5-1 (Bad MEMCAL), 5-5, (ECM error).

Project 3.4 Camaro

I didn't install it incorrectly. Though rattling around inside the ECM box couldn't have been good for it though, but it seems extreme that it would've killed it, but yeah, I'm gonna check my wiring again on monday, and chances are I won't find anything new, so most likely I'll still want the memcals, I mean its at least a 33% chance that that's the problem, and its cheaper than replacing the whole ECU or getting a chip burner and such. I'll still want to tune it eventually, but for now I just want it to run.

RBob

iTrader: (1)

To check if the PROM is OK do this:

At key-on, engine-off, observe the SES light. It should turn on briefly, blink off, then turn on solid. Can re-test after 10-seconds of key-off.

It needs to do the blink-off, if it does the PROM is OK and the ECM is running from it.

For the ALDL connector, wire the serial data to both pins: M & E

RBob.

Project 3.4 Camaro

So if the prom is bad it will just kick the SES light on solid with ign pwr, correct? As for M & E, you are saying to take 1 wire and run to both correct, if so can you specify color or location of the serial data wire? And is it possible for the EEPROM to be only partially bad and still pass that test?

Maverick H1L

iTrader: (8)

Serial data wire is in ECM A8 and is as orange as the power wires... It will pass through the ECM harness into the dash harness at the C207 (terminal J) under the dash and then it's supposed to run to both holes E and M of the ALDL...

RBob

iTrader: (1)

SES: solid on, solid off, or flashing is bad.

Yes to the ALDL, the one wire goes to both pins. One pin is for 160 baud data, the other for 8192 baud data.

RBob.

Project 3.4 Camaro

SES light steady, I even did this on my corsica before hand to know exactly what I was looking for, came on momentarily flicked off then immediately back on, camaro, just steady, not even a hint of a flicker, checked several times to be sure. Also, even after running a new wire to M and splicing it onto serial data(E) I still get nothing on the scan tool, for either the vehicle the ECU is from, or the vehicle the memcal is from, speaking of which, which car should I scan for? Last but not least, could a bad EEPROM cause the scan tool to not get a reading? Certainly seems like things are pointing to the EEPROM, also I tested pulse voltage, it varied while cranking, starting out at .03 or something, then bumped to like 1.5, then topped out at 2.8 or so when the engine tried to start.

Lastly, maverick, please PM me paypal info and shipping amount for the modules, things appear to indicate a bad EEPROM which makes sense, dead EEPROM causes ECU to try to start off of a backup chip setup for dizzy reference pulses instead of DIS pulses, and voila...fubar injection pulses...makes sense.

RBob

iTrader: (1)

Yes to both, with no SES blink the ECM is in limp mode. Which means no ALDL data either.

RBob.

Project 3.4 Camaro

Well then, I think I have at least a 85% probability of a bad EEPROM, can't wait to get those memcals off maverick and see if she'll roar again for me.