JohnCh Posted June 21 Share Posted June 21 43 minutes ago, MV8 said: The module is next to the heater valve In my defense, in 23 years of continuous se7en ownership, I've never had a heater Hopefully that helps 11budlite locate it this weekend. 1 Link to comment Share on other sites More sharing options...
11Budlite Posted June 22 Author Share Posted June 22 (edited) No heater for my car either! And also no MFRU or separate relays for the FP or cooling fan. I disconnected the (2) connecters at the ECU and saw a set of heavier pins, one on each connector. Checked for continuity between all of the pins and found (1) for the Y/G wire to the FP-Inertia switch and (1) for the B/G wire to the cooling fan. Both on the smaller connector on the drivers side of the ECU. FP circled in green in the photo below, and cooling fan circled in yellow. The wire colors are not visible at the connector without stripping back the sleeve/shielding. Edited June 22 by 11Budlite Link to comment Share on other sites More sharing options...
MV8 Posted June 22 Share Posted June 22 (edited) Hooray! Thank you for figuring it out or at least where it goes as the problem remains. What is the ecu part number? Oem late-model I assume. Perhaps ask Cat for the ecu pin out. They seem to be ok with providing bits of schematic for recent customers. Edited June 22 by MV8 Link to comment Share on other sites More sharing options...
11Budlite Posted June 22 Author Share Posted June 22 4 hours ago, MV8 said: What is the ecu part number? Oem late-model I assume. Perhaps ask Cat for the ecu pin out. They seem to be ok with providing bits of schematic for recent customers. Thanks MV8. It's P/N 30L192 from a 2019 310S. I'm going to contact them this weekend, so hopefully they can respond early next week. Link to comment Share on other sites More sharing options...
MV8 Posted June 22 Share Posted June 22 FWIW, my understanding is that this is an MBE 959 ecu encrypted for CAT and for a 125hp variable cam sigma. Use a good light and digital camera to takes close, sharp pics of the ecu pin cavities, then zoom in with your camera/pc/phone. They should be numbered and may show more info molded in, like ground and power that you could back probe through the harness connector to find the path to power when the key is off. Does this fuse list align with what you have? Link to comment Share on other sites More sharing options...
11Budlite Posted June 23 Author Share Posted June 23 Here's a photo of the ECU pins. The big connector has pins 1-81, with the (5) big pins being numbered 1-5. The small connector has pins 82 -121, with the (8) big pins being numbered 114-121. "Does this fuse list align with what you have?" - I have 20 fuses but they don't match up with that diagram. Link to comment Share on other sites More sharing options...
11Budlite Posted June 23 Author Share Posted June 23 Other than my photo being upside down this seems to match. MBE 959 Caterham Pinout: Link to comment Share on other sites More sharing options...
MV8 Posted June 23 Share Posted June 23 Dug out a pic you posted of your fuses. Added labels. Link to comment Share on other sites More sharing options...
11Budlite Posted June 23 Author Share Posted June 23 That seems to match up a lot better, thanks MV8! 1 Link to comment Share on other sites More sharing options...
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