DIY PGMFI Diagnostics - Code 0 ECU

[ECU-MAN]

Disclaimer: The following is provided as a GUIDE ONLY, and neither myself nor Ozhonda take any responsibility for the outcomes of someone else doing the following. You follow these steps at your own risk!





Aim:

Diagnose code 0, ECU, the ECU "Electronic Control Unit" is also known as ECM "Electronic Control Module"





Required:

- 10mm 3/8 socket
- 3/8 extension bat
- 3/8 ratchet
- Philips head screwdriver
- another identical ECU



So when you start your car, Your engine light "MIL" comes on and stays on. You do the PGMFI test and you get a solid CEL. Chances are its the ECU at fault. Very rare but possible for a stock ECU, more common if you have been tinkering with ROM's ect.


Symptoms

- Engine light on all the time and the bellow symptoms
- Engine will not start.
- Engine starts but only revs to 3000 or 4000 rpm
- Engine idles higher when warm
- car runs like crap



STEP 1



Locate your ECU and remove it from the car. Your ECU could be located in a number of many possible locations. Commonly on the passengers side foot well kick panel or floor well, pull the carpet back and have a look.



..







- on the floor well it will have a big metal plate covering the ECU, undo the 4 nuts holding it down with a 10mm socket ( yellow arrows ) undo any cable ties connecting to the ECU ( red arrows )

- now unplug the ECU connectors ( right yellow arrow in bellow picture ) and unplug the AT ECU if applicable ( left yellow arrows ).





STEP 2


Use a Philips head screw driver and open the ECU covers to look for obvious damage.

- undo the screws holding both covers down, back and front. (Yellow arrows in bellow pic)








Have a look in the ECU for any obvious damage. Bellow is a good example of a burnt out ECU, you can see the big black area. This is not good. This would have been cause by some one very talented who would of hooked up the battery terminal back to front or some thing like that.









The above is an obvious failure. However if you open your ECU and you do not see anything like the above, then you can only check the ROM if in place firmly in the event that you have a modified ECU.

Locate the ROM and make sure it’s firmly inserted if it’s removable. Press down firmly in the centre of the ROM to seat it. See bellow pic yellow circle






At this time you should put your ECU back together, because unless you know what you’re doing you could create a fault if it doesn’t have one.



Substitute a known good ECU in your car and retest. If you have the same problem with a solid Cell, then your ECU is more than likely ok. If the substitute ECU starts and runs fine, your original ECU is toast.



Disclaimer: The following is provided as a GUIDE ONLY, and neither myself nor Ozhonda take any responsibility for the outcomes of someone else doing the following. You follow these steps at your own risk!


No part of this DIY is to be reproduced with out acknowledgment of the site and author it came from, ie me and ozhonda.com. Do not rip parts off and claim them as your own.