Nazzywazzy Posted June 21, 2019 Report Share Posted June 21, 2019 Hey everyone, I have a 2000 1.4 Lupo that needs a new ECU. I was thinking about buying a second hand one and fitting it myself. Would this be really tricky? I have read that you may need to get it recoded from the dealer etc. is this actually the case? Thanks in advance Quote Link to comment Share on other sites More sharing options...
Rich Posted June 21, 2019 Report Share Posted June 21, 2019 Why does it need an ECU? They rarely rarely go wrong but are often diagnosed so you leave the diagnoser alone. Quote Link to comment Share on other sites More sharing options...
Rich Posted June 21, 2019 Report Share Posted June 21, 2019 Also, I would buy an ECU with the key and immob box and do it that way. Quote Link to comment Share on other sites More sharing options...
weslangdon Posted June 21, 2019 Report Share Posted June 21, 2019 If you have a TDI I have a spare ecu, but it will need coding to your car Quote Link to comment Share on other sites More sharing options...
Nazzywazzy Posted June 21, 2019 Author Report Share Posted June 21, 2019 56 minutes ago, Rich said: Why does it need an ECU? They rarely rarely go wrong but are often diagnosed so you leave the diagnoser alone. My lupo struggles to start intermittently and has lots of electrical faults (central locking not working, problems with the stereo etc. When I diagnosed it there was various short to ground faults. My mechanic checked over all the wiring to see if there was any corrosion or a bad earth and all was fine he said he was 95% sure it's a problem with the ECU 🤔 Quote Link to comment Share on other sites More sharing options...
Nazzywazzy Posted June 21, 2019 Author Report Share Posted June 21, 2019 56 minutes ago, weslangdon said: If you have a TDI I have a spare ecu, but it will need coding to your car Thank you for the offer but I don't have a TDI 😔 Quote Link to comment Share on other sites More sharing options...
Skezza Posted June 21, 2019 Report Share Posted June 21, 2019 17 minutes ago, Nazzywazzy said: My lupo struggles to start intermittently and has lots of electrical faults (central locking not working, problems with the stereo etc. When I diagnosed it there was various short to ground faults. My mechanic checked over all the wiring to see if there was any corrosion or a bad earth and all was fine he said he was 95% sure it's a problem with the ECU 🤔 That sounds like ****. If the central locking isn't working, i can't see why that's got much, if anything to do with the ECU. It is controlled by the CCM. Quote Link to comment Share on other sites More sharing options...
Nazzywazzy Posted June 21, 2019 Author Report Share Posted June 21, 2019 27 minutes ago, Skezza said: That sounds like ****. If the central locking isn't working, i can't see why that's got much, if anything to do with the ECU. It is controlled by the CCM. Tbh I don't care about the little faults like the central locking etc. It's the starting issues that are causing a problem. Right now my car is stuck in my local supermarket car park as it didn't start after an hour of trying this afternoon 😔 Quote Link to comment Share on other sites More sharing options...
mk2 Posted June 21, 2019 Report Share Posted June 21, 2019 I'll stick my neck out and say definitely not the ECU. Convenience control module (CCM) may have a link to windows and locks as already mentioned, but most likely the lock microswitches in the door. non starting means probably no fuel injecting or no ignition sparking. The ECU uses the crankshaft sensor as it's primary sensor to get the ignition to go; and water temp/MAP/MAF/air temp to work out how much fuel to throw in. Assuming fuel pump is running ok... diagnostics will tell all... the stereo not working makes me think a power relay or perhaps ignition key switch? Quote Link to comment Share on other sites More sharing options...
Rich Posted June 21, 2019 Report Share Posted June 21, 2019 I had a 1.4 with starting issues. Was the crankshaft. Go try it now it is cold and it should work. Quote Link to comment Share on other sites More sharing options...
Nazzywazzy Posted June 21, 2019 Author Report Share Posted June 21, 2019 17 minutes ago, mk2 said: I'll stick my neck out and say definitely not the ECU. Convenience control module (CCM) may have a link to windows and locks as already mentioned, but most likely the lock microswitches in the door. non starting means probably no fuel injecting or no ignition sparking. The ECU uses the crankshaft sensor as it's primary sensor to get the ignition to go; and water temp/MAP/MAF/air temp to work out how much fuel to throw in. Assuming fuel pump is running ok... diagnostics will tell all... the stereo not working makes me think a power relay or perhaps ignition key switch? 15 minutes ago, Rich said: I had a 1.4 with starting issues. Was the crankshaft. Go try it now it is cold and it should work. Thanks guys, you've both been extremely helpful. Funnily enough, the car never struggles to start in winter... The diagnostic said something about the fuel injectors, here's exactly what it picked up: Address 01: Engine Labels: 036-906-014-AHW.LBL Controller: 036 906 014 BLw Component: MARELLI 4CV 2802 Coding: 00003 Shop #: WSC 01236 VCID: D2D7794B0DF7 5 Faults Found: 01249 - Fuel Injector for Cylinder 1 (N30) 29-10 - Short to Ground - Intermittent 01250 - Shareware Version. To Decode all DTCs 29-10 - Please Register/Activate - Intermittent 01251 - Shareware Version. To Decode all DTCs 29-10 - Please Register/Activate - Intermittent 01252 - Fuel Injector for Cylinder 4 (N33) 29-10 - Short to Ground - Intermittent 01312 - Shareware Version. To Decode all DTCs 37-10 - Please Register/Activate - Intermittent Readiness: N/A ------------------------------------------------------------------------------- Address 02: Auto Trans Labels: None Controller: 001 927 749 G Component: AG4 Getriebe 001 2022 VCID: 1E4F5D7B89AF No fault code found. ------------------------------------------------------------------------------- Address 15: Airbags Labels: 6Q0-909-605-VW5.LBL Controller: 6Q0 909 601 Component: 02 AIRBAG VW5 0003 Coding: 12338 Shop #: WSC 01236 VCID: F093D3C3A3BB 1 Fault Found: 00532 - Supply Voltage B+ 07-10 - Signal too Low - Intermittent Quote Link to comment Share on other sites More sharing options...
Rich Posted June 21, 2019 Report Share Posted June 21, 2019 So shorts on one and four That wouldn't stop it starting. Quote Link to comment Share on other sites More sharing options...
Nazzywazzy Posted June 21, 2019 Author Report Share Posted June 21, 2019 4 minutes ago, Rich said: So shorts on one and four That wouldn't stop it starting. I give up 😭😭 Quote Link to comment Share on other sites More sharing options...
weslangdon Posted June 21, 2019 Report Share Posted June 21, 2019 3 hours ago, Nazzywazzy said: Thank you for the offer but I don't have a TDI 😔 There are 3 types of 1.4 litre Lupo, a 75bhp petrol, a 100bhp petrol and the TDI Quote Link to comment Share on other sites More sharing options...
Rich Posted June 21, 2019 Report Share Posted June 21, 2019 Well I'm assuming this is a 75 version. Does it crank when you turn the key? Quote Link to comment Share on other sites More sharing options...
mk2 Posted June 21, 2019 Report Share Posted June 21, 2019 Its a power relay failure... ecu thinks there's a short. Reality is there's no volts. Quote Link to comment Share on other sites More sharing options...
Skezza Posted June 22, 2019 Report Share Posted June 22, 2019 I don't know why..... But I'd be interested to see what happened if you tried jump starting it off another car with a good battery. Quote Link to comment Share on other sites More sharing options...
Sausage Posted June 22, 2019 Report Share Posted June 22, 2019 Pull the plugs off the ecu and look for dark corroded pins and connections there as well. That is all 4 injectors not working so check their wiring loom too. If you have to take it somewhere then take it to an auto electrician as opposed to a mechanic due to specialist knowledge, so it will be less guess work. Quote Link to comment Share on other sites More sharing options...
loopydebs Posted June 22, 2019 Report Share Posted June 22, 2019 Where are you based? I have recent ecu fun experience if I can help in any way xx Quote Link to comment Share on other sites More sharing options...
Nazzywazzy Posted June 22, 2019 Author Report Share Posted June 22, 2019 Thanks for your help everyone. 10 hours ago, Rich said: Well I'm assuming this is a 75 version. Does it crank when you turn the key? It does crank when I turn the key, but just doesn't fire up. But yesterday afternoon, it cranked, fired up and then immediately cut out and wouldn't start again! 7 minutes ago, loopydebs said: Where are you based? I have recent ecu fun experience if I can help in any way xx I'm based in Bristol! X 47 minutes ago, Skezza said: I don't know why..... But I'd be interested to see what happened if you tried jump starting it off another car with a good battery. I have thought about that, I'll give it a try next time it happens. 44 minutes ago, Sausage said: Pull the plugs off the ecu and look for dark corroded pins and connections there as well. That is all 4 injectors not working so check their wiring loom too. If you have to take it somewhere then take it to an auto electrician as opposed to a mechanic due to specialist knowledge, so it will be less guess work. Thank you, good shout taking it to an auto electrican rather than a mechanic. Quote Link to comment Share on other sites More sharing options...
loopydebs Posted June 22, 2019 Report Share Posted June 22, 2019 ahh I’m nowhere near you sorry! Hope you get it sorted, it’s such a pain/worry. Trust your instincts with regards to mechanics and do your research on their reviews etc xx Quote Link to comment Share on other sites More sharing options...
Nazzywazzy Posted June 22, 2019 Author Report Share Posted June 22, 2019 I think my next step is to take it to someone for a proper diagnostics rather than relying on the vagcom 😫 Quote Link to comment Share on other sites More sharing options...
loopydebs Posted June 22, 2019 Report Share Posted June 22, 2019 Is there anyone on here near Bristol that could recommend a good garage? Quote Link to comment Share on other sites More sharing options...
mk2 Posted June 22, 2019 Report Share Posted June 22, 2019 1 hour ago, Nazzywazzy said: I think my next step is to take it to someone for a proper diagnostics rather than relying on the vagcom 😫 I hate to say it, but diagnostics are as good as the software INSIDE THE ECU... When you design an ECU, certain things have to assumed to be ok, so diagnosis can be hit and miss. That's where the autoelectricians earn their money. It's more thinking, head scratching and relying on past knowledge than actual "doing" usually. Electrics are like christmas trees lights- it takes just one in the chain to knock them out. Then it takes time to find it. Quote Link to comment Share on other sites More sharing options...
Rich Posted June 22, 2019 Report Share Posted June 22, 2019 2 hours ago, loopydebs said: Is there anyone on here near Bristol that could recommend a good garage? I liked the guys near Eldon road. They were sound and kept lending me stuff. 1 Quote Link to comment Share on other sites More sharing options...
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