 | Home > Technical > 14CUX issues, help please |
 
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| sasdiscos Member Since: 22 Jul 2023 Location: UK Posts: 122  
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And I have a second ecu that does the exact same thing.
The only thing left is the loom from rpi. Steve.  Click image to enlarge Click image to enlarge |
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11th Sep 2023 8:17pm |
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| rallysteve Member Since: 10 Feb 2014 Location: Cumbria Posts: 2198  
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Do the relays energise when the ecu is unplugged? 02' 110 TD5 Double Cab Rebuild Thread
84' 90 3.9 V8 Caged Pickup Build Thread - Now For Sale Mobile Diesel Heater Build Thread |
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11th Sep 2023 8:32pm |
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| NickMc Member Since: 01 Oct 2014 Location: Norn Iron Posts: 1568  
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Are the relays the right type and style? Is the inertia switch working?
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11th Sep 2023 8:48pm |
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| sasdiscos Member Since: 22 Jul 2023 Location: UK Posts: 122
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No, only when the ecu is plugged in. |
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11th Sep 2023 8:54pm |
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| sasdiscos Member Since: 22 Jul 2023 Location: UK Posts: 122
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They are double throw but don’t have the diodes in. Rpi say this shouldn’t matter. |
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11th Sep 2023 8:54pm |
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| rallysteve Member Since: 10 Feb 2014 Location: Cumbria Posts: 2198
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Are you certain you have all the earths connected? Can only see one in your photo but from memory my loom has at least 3 02' 110 TD5 Double Cab Rebuild Thread
84' 90 3.9 V8 Caged Pickup Build Thread - Now For Sale Mobile Diesel Heater Build Thread |
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11th Sep 2023 9:43pm |
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| sasdiscos Member Since: 22 Jul 2023 Location: UK Posts: 122
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There are 2 ring crimps that earth to the head. Tested ok and one that is at the front. Again tested ok. Have checked all of them with a meter right up to the connector.
At a complete loss now. Steve. |
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11th Sep 2023 9:56pm |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6480 
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What's the colour code of the input wires on the RPi loom? I can see brown (x2 or is one black), green, purple, white.
The very basics you need are a permanent (battery) 12V feed into the loom, and a switched 12V ("ignition") feed, plus one or more grounds, depending how the loom has been made. It's critical ALL the earths/grounds are back to the battery -ve. ECU pins 14, 27, 40 all need to be at 0V. I can't work out from the photo what's going on with the wiring near your toggle switch (too many black wires), can you clarify? Need some more detail. You have an alligator clamp on ground(s), a feed into a green wire on the black plug in the middle, and a feed into a thin white wire. The permanent battery feed should be to whatever (large) wire ends up at the 30 terminal of the main relay (which I think is the one on the black base). The ignition feed should be to whatever (smallish) wire ends up at the 86 terminal of the fuel pump relay (blue base probably). This assumes RPi's loom follows the factory manual schematic... Basics to check. Remove ECU, meter on continuity. ECU pins 14, 27, 40 back to battery -ve terminal ECU pin 15 back to battery +ve terminal ECU pin 19 to "ignition switch" output Remove main relay Terminal 30 and 86 back to battery +ve terminal Terminal 85 to ECU pin 12 Check relay terminal matches wiring of relay sockets, not sure it can happens so much with double output relays but there are those around with 30 and 86 swapped which will cause havoc! 1988 90 Td5 NAS soft top
2015 D90 XS SW |
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11th Sep 2023 10:25pm |
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| sasdiscos Member Since: 22 Jul 2023 Location: UK Posts: 122
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Martin, Thanks so much for the info, Will double check again tonight.
There are 3 grounds. 2 ring crimps that would bolt to the head. And one wire that ends up on the lh bank by the alternator. Bells back to the multi plug earth point but can’t remember which one, this struck me as an odd place to have an earth point. I ran a new 16mm earth direct to battery from the head. There is brown green up to the main relay from the fuse box. Perm live. The. Purple white from the fuse box to the fuel pump relay. Again perm live. A switched ign white green but the dig says slate white. The loom is white green though. I put diodes in the relays last night to check and it made no difference. I have belled out to test for shorts but couldn’t find any. I’m so close to going for a start and this is doing my head in. It’s ready to go. Thanks again, Steve. |
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12th Sep 2023 7:25am |
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| sasdiscos Member Since: 22 Jul 2023 Location: UK Posts: 122
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It's critical ALL the earths/grounds are back to the battery -ve. ECU pins 14, 27, 40 all need to be at 0V
Rpi told me ground connections were 4/14/40….. Steve. |
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12th Sep 2023 8:13am |
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| MercianRover Member Since: 07 Apr 2022 Location: Culworth Posts: 124 
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This is incorrect - they wouldn't have been used if they didn't serve a purpose. I recall the 100" Bowler racer had a problem which we traced to the relays not being the type with diodes. |
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12th Sep 2023 8:21am |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6480
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OK yes 4 might need to be ground too, perhaps only with cats though. 27 definitely should be grounded. 1988 90 Td5 NAS soft top
2015 D90 XS SW |
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12th Sep 2023 9:20am |
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| NickMc Member Since: 01 Oct 2014 Location: Norn Iron Posts: 1568
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The diodes are going to be fitted in the relays to avoid voltage spikes to the ECU. It sounds like something is wired backwards or wrongly pinned out.
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12th Sep 2023 8:07pm |
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