R33 RB25DET engine won't start ECU fault found ECCS clicking

Kustom20 · October 7, 2017

Hi Peeps,

just thought to post this up, even if it comes in handy one day for someone with the same fault. As we know SAU is a great community for anything Skyline related

I wont go into full detail, just a basic overview - I recently completed mods to my R33 and got the vehicle tuned. After a long 2 1/2 years in prep and paint and taking the vehicle off the road. I had to remove all mods for RWC - the last 2 days I removed exhaust side and Intake side basically everything to change back to stock.

After fitting everything up and double checking to ensure I had covered all bases, checked earth connections, sensor plugs. Was time to fit the stock ECU and turn the key.

On the initial first cranking it did not start within 5 or so seconds, tried again, nothing at all. Was safe to assume something isn't working. After I turned the key to the off position I noticed a relay located next to the ECU kept clicking. ECCS relay - I thought it may have had something to do with the AFM wiring so I double checked it, only because one mod is the upgraded AFM - then tested the AFM wiring with Multi meter seems to have correct readings. And when I unplugged the AFM the ECCS relay stopped clicking.

Also because I had changed to a S1 inlet manifold - I thought to also swap out the TPS with my S2 item. I then turned the key to on but not start and the ECCS was still clicking when the key was turned off. At this stage, I ran a quick ECU fault code diagnostic check - results were code 55 - no faults recorded. I installed the Apexi PFC back into the vehicle and got Co-Pilot running to set the TPS to the correct setting. And also check the sensor readings - everything seemed to be correct, except the TPS which was on 9.

Last thing was to open the Stock ECU housing - seen as it was sitting for 7 years to inspect inside for potential corrosion. And there it was as clear as day. Capacitor corroded. Also ran a quick test with the multimeter and found the number 2 was showing zero reading and all others were in the 460 to 470 range. Even though number 1 shows a reading but also corrosion I would be replacing this as well.

After finding this - i uploaded a base map back into the Apexi and car fired up straight away. Its kind of constipated going from 360kw back to stock