murrayis Posted May 17, 2015 Share Posted May 17, 2015 Hi Guys, Finally have some time to plug everything back in - which for the most part I have done. I've just gone to turn the key to check power and all sensors are reading however I have limited power to the ECU harness. Where should I start looking? Which part of the engine harness does the power connect in? Checking the Power pins on the ECU plug there is nothing... So I assume its a relay or similar? I've checked the white plugs next to the main ecu plug and there is a couple of pings with 12v however nothing through to the ecu. Help - TIA Link to comment https://www.sau.com.au/forums/topic/456689-hcr32-electrical-issue-no-power-to-ecu/ Share on other sites More sharing options...
murrayis Posted May 17, 2015 Author Share Posted May 17, 2015 I've check pins 16 and 45 as per this document for Adaptronics (I'm on Haltech but the same) and I get 0 on both no matter what condition. http://www.adaptronic.com.au/forum/index.php?topic=4953.0;wap2 Link to comment https://www.sau.com.au/forums/topic/456689-hcr32-electrical-issue-no-power-to-ecu/#findComment-7535218 Share on other sites More sharing options...
iruvyouskyrine Posted May 17, 2015 Share Posted May 17, 2015 Does the haltech use the standard Engine wiring harness? Link to comment https://www.sau.com.au/forums/topic/456689-hcr32-electrical-issue-no-power-to-ecu/#findComment-7535288 Share on other sites More sharing options...
murrayis Posted May 17, 2015 Author Share Posted May 17, 2015 Hi Yes plug anf play. Ive checked all fuses on the car and immobilisers and they are all fine. Link to comment https://www.sau.com.au/forums/topic/456689-hcr32-electrical-issue-no-power-to-ecu/#findComment-7535296 Share on other sites More sharing options...
iruvyouskyrine Posted May 17, 2015 Share Posted May 17, 2015 The power is fed from a plug next to the washer bottle. It's a big rectangle 8 pin (?) plug and the the two biggest gauge cable is your positive and negative. From memory the white wore with purple trace is positive and black with red trace is negative. Turn your ignition on and prob these pins for power. They are the single ECU power supply. Link to comment https://www.sau.com.au/forums/topic/456689-hcr32-electrical-issue-no-power-to-ecu/#findComment-7535416 Share on other sites More sharing options...
jiffo Posted May 17, 2015 Share Posted May 17, 2015 Also check the two green coloured relays beside the ecu. One is the ecu relay, the other the IGN coils relay. Link to comment https://www.sau.com.au/forums/topic/456689-hcr32-electrical-issue-no-power-to-ecu/#findComment-7535437 Share on other sites More sharing options...
murrayis Posted May 17, 2015 Author Share Posted May 17, 2015 I'll replace both these relays asap. Nissan want $70 each for them or japan nissan for $22 each so it might take a week to get them. I'll check that plug also. Link to comment https://www.sau.com.au/forums/topic/456689-hcr32-electrical-issue-no-power-to-ecu/#findComment-7535518 Share on other sites More sharing options...
jiffo Posted May 18, 2015 Share Posted May 18, 2015 No need to replace them, swap them with another from the fuse box as a test. Very rare for either of them to fail so you need to test everything related to power into the ecu. Only one of those is your ecu power, the other is the coils. You're looking for ecu power. Link to comment https://www.sau.com.au/forums/topic/456689-hcr32-electrical-issue-no-power-to-ecu/#findComment-7535563 Share on other sites More sharing options...
murrayis Posted May 18, 2015 Author Share Posted May 18, 2015 Engine bay switch box or under dash? I did notice there was relay in the under dash fuse area. - Is it spare? Link to comment https://www.sau.com.au/forums/topic/456689-hcr32-electrical-issue-no-power-to-ecu/#findComment-7535578 Share on other sites More sharing options...
Duncan Posted May 18, 2015 Share Posted May 18, 2015 I've had similar trouble before with PFC on a series 2 33 gtst and on a custom wired 32 gtst just on the weekend. There are wiring differences in ECU power between different models and I'm not convinced the various "plug in" ECUs handle it correctly. It will vary by car and loom, but on 32GTR for instance, ECU power is pins 49 and 59. Battery 12v goes to 58. When the ECU wants to turn itself on (or more importantly off) it earths pin 16 which turns on the ECCS relay which in turn gives 12v to 49 and 59. So I would start with checking if you have no power at pins 49 and 59 with the ECU plugged in and ignition on. In both the cars I mentioned above it the ECCS relay was either absent or not wired in, which meant 12v was not being supplied to those pins which the PFC relies on. Link to comment https://www.sau.com.au/forums/topic/456689-hcr32-electrical-issue-no-power-to-ecu/#findComment-7535751 Share on other sites More sharing options...
murrayis Posted May 18, 2015 Author Share Posted May 18, 2015 Ok so I checked the relays and they seem fine. I however found the plug pictured above floating at the end of the harness near the LHD headlight, If this the correct plug? \ I checked and it does have 12v with ignition on - So where does it go? I cannot find a corresponding receptacle :s Link to comment https://www.sau.com.au/forums/topic/456689-hcr32-electrical-issue-no-power-to-ecu/#findComment-7535814 Share on other sites More sharing options...
Duncan Posted May 18, 2015 Share Posted May 18, 2015 that's the very last plug on the ecu loom.....so go back to the firewall near the ECU and you'll see where that loom comes through, follow it forward past ABS connectors, 02 sensors, AFM and then that plug will be next Link to comment https://www.sau.com.au/forums/topic/456689-hcr32-electrical-issue-no-power-to-ecu/#findComment-7535852 Share on other sites More sharing options...
murrayis Posted May 18, 2015 Author Share Posted May 18, 2015 I think I found it. Link to comment https://www.sau.com.au/forums/topic/456689-hcr32-electrical-issue-no-power-to-ecu/#findComment-7535869 Share on other sites More sharing options...
jiffo Posted May 18, 2015 Share Posted May 18, 2015 That would be the problem. 2 Link to comment https://www.sau.com.au/forums/topic/456689-hcr32-electrical-issue-no-power-to-ecu/#findComment-7535894 Share on other sites More sharing options...
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