Hondata

well ive had the s300 in my car for almost a year and have came across a problem. the car has been sitting for a couple of months while i built a new motor. the issue is that the ecu light will be green for a few seconds then go red after the fuel pump primes just wondering what this means??? the car will not start.. the motor is 75.5mm wisecos, eagles, calico coated bearings fully balanced and blueprinted. port and polished head t3/t04e 50 trim. thanks for your help.

First check obvious things, like the connectors are all the way in, the thermostat ground is good, and the battery is not flat. Next upload your calibration again to the ECU, then check if you can connect to the ECU and datalog.

all sensors and grounds have been checked and double checked. we can download the previous map from and upload maps the car and the smanager say were are online. but we have no readings any of the senors on the car via datalog or realtime. nothing has changed except for the motor. it was the ecu was working fine before this motor. i have changed to the new version of the software and then tried going back to the old neither worked.

It is the communication between the s300 and the ECU. Check that the s300 is inserted correctly into the pins, and then check that the soldering is good (especially on CN2).

Who socketed the ecu?

i got it fixed i dont know what the problem was??? i uploaded a stock map and started up. i guess that maybe the map got corrupted from sitting for a couple of months... should be turning up the boost here in a couple of days..