Ask the Factory Q#1 – I am writing to you from Japan. I work in automotive maintenance. I am working on a Radical SR4 engine that will not start. The fuel pump and ignition coil are not working either. I want to check if the engine control module is working properly. Can I have a wiring diagram for the Radical SR4 (Chassis No: SR4 00082j) Best regards, Atsushi K.

A:  Hi Atsushi, attached is a copy of the Wiring diagram that will help you with your car.  The SR4 you are working on shares the same engine wiring harness as the SR3, so the attached SR3 wiring diagram should be very helpful in troubleshooting your issue.

Additionally, plugging into the Life ECU and using the Life Racing Software package will be very helpful in troubleshooting this issue.  Specifically, the PT-Mon program should be very helpful at this stage when the engine is not running / logging data.  Using PT-Mon you can check fuel pressure, oil pressure, sync. State, and other signals to rule out ECU Trip before searching for wiring or ECU issues.  Please let us know if you have any other questions.

Radical Factory