Slomotion Posted February 23, 2021 Report Share Posted February 23, 2021 Hi all, I have installed an Bosch 82mm throttle body but am having a few issues with the wiring colouring. I have the following wire colours but can open the throttle body but still having fault codes. Green Red Yellow Black Blue/black Blue can someone clarify what colours are for what. cheers, kim Quote Link to comment Share on other sites More sharing options...
Vaughan Posted February 23, 2021 Report Share Posted February 23, 2021 Might be easier if you post a picture of the throttle body plug so we can see which wires go to which pin. Also a PCLink log from engine start to fault code happening and a copy of your basemap please. Does the E-Throttle work in setup mode with the engine off? Quote Link to comment Share on other sites More sharing options...
Slomotion Posted February 28, 2021 Author Report Share Posted February 28, 2021 Hope this helps Quote Link to comment Share on other sites More sharing options...
Adamw Posted February 28, 2021 Report Share Posted February 28, 2021 Is that the factory wiring? All the manuals I have show different colours and I can find no diagram with the colours you have.  The errors you have above suggest the 5V is shorted to ground so you definitely have something quite wrong.  Do you have a photo of the wiring with the original subaru plug on? Quote Link to comment Share on other sites More sharing options...
Slomotion Posted June 13, 2022 Author Report Share Posted June 13, 2022 After taking my car to three workshops and still not running I have finally seen the same harness wiring for the throttle body, yes it has been a long time since the last question it has been a long journey. Currently I have the pin out as follows 1. motor (-) yellow (same size wire as motor + so assume negative) 2. tps (-) black/grey 3. tps (5v) red (volt meter confirmed 5v) 4. motor (+) black (voltmeter confirmed 12.8v) 5. TPS 2 (out) green 6. tps 1 (out) blue throttle body still not moving on start up sequence or even with 9v battery test rig. any assistance is greatly appreciated as I don’t want to waste another year working on the same problem without success. many thanks, kim What I believe the wiring for the factory is as follows 6. blue tb main 5. red 5v 4. green tb sub 3 black/grey sensor ground 2. black tb (+) 1. Yellow tb (-) This picture was off a 2007 sti wiring harness for the throttle body. Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 13, 2022 Report Share Posted June 13, 2022 Black is motor -ve. Yellow is motor +ve. The rest looks correct. Do you have realistic voltages showing on the TP Sub and main AN Volt channels? With E-throttle turned off, do the TP voltages move when you move the throttle blade by hand? Have all your other fault codes gone now? Quote Link to comment Share on other sites More sharing options...
Slomotion Posted June 13, 2022 Author Report Share Posted June 13, 2022 I’ll try the reversal of yellow and black and have not checked the ecu yet as the tb doesn’t make any movement or noise. Getting it tested tomorrow Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 13, 2022 Report Share Posted June 13, 2022 It wont make any noise if you have it set to quiet mode in the software. It wont attempt to move until all the calibrations are done, there are no errtors, and it is happy with the signals from everything. Quote Link to comment Share on other sites More sharing options...
Slomotion Posted June 14, 2022 Author Report Share Posted June 14, 2022 Thanks just charging my laptop now Quote Link to comment Share on other sites More sharing options...
Slomotion Posted June 14, 2022 Author Report Share Posted June 14, 2022 A few less codes come up Now have the following wiring format 1. motor (-) black 2. tps (-) black/grey 3. tps (5v) red (volt meter confirmed 5v) 4. motor (+) yellow 5. TPS 2 (out) green 6. tps 1 (out) blue Have I got blue and green wires the wrong way around? Or tps - and tps + 5v the wrong way round? Or both? Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 14, 2022 Report Share Posted June 14, 2022 Blue and green swapped wouldnt matter.  There is something wrong in the wiring if the fault codes are all telling you the analog inputs are all at ground. That is why I suggested this: On 6/13/2022 at 8:54 PM, Adamw said: Do you have realistic voltages showing on the TP Sub and main AN Volt channels? With E-throttle turned off, do the TP voltages move when you move the throttle blade by hand? So, get the TPS signals working first, then you can worry about the throttle once those are right.  Quote Link to comment Share on other sites More sharing options...
Slomotion Posted June 15, 2022 Author Report Share Posted June 15, 2022 Hi Adam, no voltage change when moving the blade with e throttle off Quote Link to comment Share on other sites More sharing options...
Slomotion Posted June 15, 2022 Author Report Share Posted June 15, 2022 I can’t figure out where it is grounding, should I replace the throttle body pin adapter to see if that could be the issue? Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 16, 2022 Report Share Posted June 16, 2022   What I would do is set the error high/low value on your 2 TPS analog inputs to 5.0 and 0.0V. This will then disable the error value overwriting the real voltage so you have a better indication of what is going on. You can then put a large gauge on your screen showing the voltage on those analog inputs (like example below), then you could get a paper clip or similar and bridge the 5V wire to one of the TP wires, if wiring is ok you should then see 5.00V on the gauge. Then remove the paper clip and you should see 0.00V. Test the other TP signal wire the same. If that works then it would suggest the wiring back to the ecu is ok and the problem is just at the throttle connector pinout or similar. If you still dont see the voltages changing on screen when doing this test then it would suggest the short is somewhere in the wiring back to the ecu. Do you know the part number on the throttle body?  Quote Link to comment Share on other sites More sharing options...
Slomotion Posted June 16, 2022 Author Report Share Posted June 16, 2022 Quote Link to comment Share on other sites More sharing options...
Slomotion Posted June 16, 2022 Author Report Share Posted June 16, 2022 0 280 750 473 Is on the tb Quote Link to comment Share on other sites More sharing options...
Slomotion Posted June 18, 2022 Author Report Share Posted June 18, 2022 Hey Adam, followed your suggestions and changes with no joy. I had the Brandt system taken out but not sure if this would have any bearing on this issue I might hook up the old ecu and see if that works Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 19, 2022 Report Share Posted June 19, 2022 On 6/18/2022 at 4:14 PM, Slomotion said: followed your suggestions and changes with no joy. What does no joy mean? What voltages were showing on AN 2 & 3 when you done the tests? Quote Link to comment Share on other sites More sharing options...
Slomotion Posted June 20, 2022 Author Report Share Posted June 20, 2022 The voltage did not change Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 20, 2022 Report Share Posted June 20, 2022 So do they stay at 0V or something else? This would suggest you have a short or disconnection in the wiring somewhere between the ECU and throttle.  Quote Link to comment Share on other sites More sharing options...
Slomotion Posted June 28, 2022 Author Report Share Posted June 28, 2022 I think I found the problem which is the TB connection plug as I took the TP main out as well as the sub and ran a volt meter and ran 5v circuit no issues. Ordered a new plug and see if that does the trick Quote Link to comment Share on other sites More sharing options...
Slomotion Posted July 3, 2022 Author Report Share Posted July 3, 2022 Hi Adam swapped the 5v with tps - (as the voltage was showing the in the tps -) now can open and close the throttle body by the accelerator. Have I got it right? Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 3, 2022 Report Share Posted July 3, 2022 You will need to attach a log and the tune. Quote Link to comment Share on other sites More sharing options...
Slomotion Posted July 3, 2022 Author Report Share Posted July 3, 2022 Cheers will do, you are a. Legend thanks for your guidance Quote Link to comment Share on other sites More sharing options...
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