Car: Honda Civic EF
Engine: Carb to D15B vtec
ECU: P08 JDM rechipped box and P08 JDM stock box
Wirings: Okay except that i recently discovererd that the car has no main relay - Fuel Pump is directly connected to the ignition switch/key
Car is running fine. No CEL or whatsoever. Recently, I borrowed my friends Rechipped/Programmable ECU to test the CROME's launch control feature in my car. I just plugged in my friend's ECU and viola! my car runs aggressively and the launch is soooo cool!
Here's the bad thing happened, after the test, my friend plugged in the Programmable P08 back to his car and suddenly his car wont start! :( :O my friend borrowed my Stock P08 ECU and then tested it in his car, same scenario happened, his car also did not start! :( we borrowed a stock ECU from another friend and my friend's car started and ran fine. I think both ECUs are now broken. (my stock p08 and the programmable p08 ecu of my friend) :(
Troubleshooting1: (friends car): Using the recently working Programmable P08 and my Stock P08 box
- No CEL
- ECU startup ok (check engine turns on then off)
- The main relay is not clicking
- The fuel pump is not priming (checked the fuel rail no gas)
- Checked the iginition (there is spark in the plugs - distributor)
- Car won't start
Troubleshooting2: (friends car): another p08 ECU from another car
- No issues
- Car runs fine.
Another test: My friend's programmable P08 ECU and the stock P08 ECU when plugged in my car is working perfectly fine. It is just that both ECUs now wont let his car start. We also tested both ECUs to other car and the same scenario happened.
Conclusion: The stock P08 ECU and the programmable P08 ecu is Broken :( It is only working in my car! and these two ECUs are not working to other normal cars.
Findings: My Civic EF has no main relay! I guess the wires are directly connected to the ignition switch. Fuel pump is bypassed :-S
Solution: Restore the wirings back to original. Install a main relay.
Now, my Big Question is: How do i fix broken ECUs, what components do i need to check and replace? When i look at the programmable p08 box of my friend, i cannot see a trace that is broken or a component that is damaged. I need to fix my friend's ECU. Please help.