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Unplug ECU. Unplug TPS. Unplug boost pressure sensor. Now, all the wires, placing your ground (black) multimeter lead at the ECU end, measure resistance of the 5V line at the boost sensor plug. Then do the same to the TPS plug. Then do the same for all the other wires that relate to the TPS, or boost sensor. All of your measurements should be very very low. You're looking to see if wiring is out of wack here. Secondly, from memory on the R33 (not a neo motor, so I'm assuming an r34) the ground wire for the TPS and boost sensor are NOT equal to ground of the car/battery. IE, DO NOT connect ground of the sensor to the engine/body of car. You'll get a ground loop, and/or potentially screw shit up. In electronics, ground for a circuit, is not necessarily equal to ground of another circuit. So this leads me to ask, when measuring your 5V, how are you getting 1.5V? Where are your multimeter leads touching for both the red and black lead on the multimeter? If you're measuring power on the sensor wire, and putting ground on the car chassis or negative battery terminal, that could be all of your issues in "getting 1.5v". Electronics engineers can do some funky stuff with circuits, and when both sensors are on, it's enough laid to alter how the ECU is functioning. -
Nissan Oz are too busy trying to decide whether we need a Qashqai or Xtrail (whatever the difference is), really not a new issue. At least we can import cars they decided not to directly, at much better value. BTW can I confirm ADM Q50 all have no spare tyre (just goop)? Is that the same in JDM skyline? I'm going to need to sort something, I can't do billions of highway klm without a spare -
Post up the manual extract and the wiring diagram (seeing as we've got no idea what type of car we're talking about here) to help with decision making. (Also, I'm nowhere near home and my wiring diagrams and manuals). I wouldn't suggest you do what you mentioned above on such a vague description, for a start! Depends on whether the power is from the ECU or the ground is at the ECU. -
Hi all quick update, so i checked the wiring circuit on TPS / Boost sensor, everything checks out fine. So at this point im really leaning towards 2nd fried boost sensor due to bad ecu maybe? Is there a way or value to check for when ohm testing the boost sensor? Also is there a way to bypass the boost sensor? Thankyou -
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