A friend of mine was using a chipped P28 to run a B18C. One day he parks the car come back after a few minutes and it wont start. nothing looks physically wrong with it. the CEL came on solid and the fuel pump would not prime. I diagnosed the main realy wiring and when I got to the last step where it tells you to check for battery voltage for 2 seconds the battery voltage was constant. the problem wasn't with the chipping itself since if you remove the jumper the problem was still there. we got an obd1 to obd2a jumper harness and used an OBD2a ECU and it runs fine. can the P28 be saved?
P28 is pushing up daises
NeonPinHead
21 - 26 of 26 Posts
This one does not show code 0 or any other code for that matter. You turn the key to on and the cel comes on for a couple secs and goes off like normal but the fuel pump does not prime. It is ecu related since using my ecu starts the car just fine. Has nothing to do with chipping since it does the same thing with j1 disconnected. My only other guess would be the c14 capacitor I replaced was faulty?
I got that from your previous post but you still haven't told me the board type or explained further into this corrosion damage.
Check the legs of all electrolytic caps on the board and check them well. Moving the caps to see if they feel loose is a way to check for unseen corroded legs as well. These computers are getting old and nearly every one I work on these days needs a handful of lytics replaced.
Check the legs of all electrolytic caps on the board and check them well. Moving the caps to see if they feel loose is a way to check for unseen corroded legs as well. These computers are getting old and nearly every one I work on these days needs a handful of lytics replaced.
The corrosion isn't on the board but the plug pins coming into the ecu. It's just a bit of green coloration indicative of moisture. The lacquer on the top side of the board is orange and crusty in most spots around components I don't know if that indicated over-heating or not.
board number is 02D01720-1500
I replaced the QM3 component today which is a STA413A transistor array and the ECU is back to life! I ordered an extra one to see if it will fix the other dead ECU.
21 - 26 of 26 Posts
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