nicostar

Sorry to revive an old thread mate, wanted to know if there is a way to achieve this with some kind of dc converter? I got one of these racks with the solenoid in it but my r33 didn't have the solenoid type rack or wiring for it to begin with.

Thanks GTSBoy, I've been duped by ebay.

thanks GTSBoy, I really just wanted to have a backup ecu. I bought this gts4 manual one from ebay, turns out it is no good. I see no signs of nistune in it at all. It can be nistuned but I'm not ready for that yet, I just want to ensure I have a backup ecu, and if I do get the nistune chip the ecu should at least be working, in this case it isn't.

i don't have the number for the ECU I am currently using, got it like that. I don't mind if that one is auto or manual it is working fine, the second ecu I got is gts4 but as my backup ecu, it is not working.

sorry to revive an old thread if that is a bad thing here, but would you know if this gts4 manual ecu can work on the rwd rb20det man ual setup? would pin 56 still be needed?

will installing a gts4 manual RB20det ECU to rwd gearbox and rb20det auto engine loom cause any issues? any known sensors needed different from rwd rb20dets? currently I have an ecu (likely auto) with an auto engine loom (if they are different from manual looms), but its wired to a rwd rb20det and gearbox and starts perfectly fine. I got a gts4 manual rb20det ecu but it doesn't start the engine, if I get a lucky start I have to hold the gas pedal but once I let go it will not start again at all. Would I have to change the cas timing? tps readjusting? idle air screw readjust?

unless earth doesn't mean ground anymore, I am fully aware of what happens when + meets - I do have an idea how the ac should work I currently can't get it to work and just need some advice. At this point I am unsure I will find that advice here. Thanks for trying to help all the same mate.

oh ok, well in that case the wiring for the both are fine for me, would you happen to know if the ac control unit has a ac switching signal that you can see a change with a volt meter or test light when ac button is pressed on and off? Also if I put a ground to pin 46 shouldn't pin 9 send out a ground to the compressor?

can you explain run side by side? which wire goes into which? o2 sensor has 3 wires (power, signal and ground) the ps switch has 2 (one side grounded and the other continues the ground when switch is closed)

can anyone confirms if this works for rb20det?

well HVAC unit showing code 20 currently which means all sensors ok, ac wires hooked up how they should be through the ecu and nada ac works. still the grey wire for "pin 36" is the only one left out. Also the engine doesn't seem to idle up when power steering pressure is present (locking the steering wheel all the way this switch is hooked up to send signal to pin 19 so no issues with wiring switch is also working) nor when pin 46 is grounded, 12v is present in pin 46. I've read somewhere that a bad o2 sensor can cause idle to not respond unless you plug it out or replace it, any advice would be good, I am hoping that is the reason why ecu won't idle up when ground signal sent to pin 46.

ok will check for power from pin 46 and test, pressure appears good and refrigerant is in the system, I don't think the compressor relay would turn on the compressor when given the ground signal from inside cabin if the pressure switch wasn't working, the ac wiring from the hvac unit are intact, only wires chopped were the ones that went to ecu from body loom connector to ecu. apart from the pressure switch can you suggest what else needs to be working? the only sensor not working at the moment is the outside air temperature sensor according to the hvac self diagnosis.

the thing is, I have probed every single wire from the HVAC unit whilst turning ac on and off, and I see no change in any single wire from volts to ground. The ac button lights up and light goes away when it is being switched and it shows "ac on" on the display and goes away when it should be off. Will try that test on the ecu however.

Hmmm... well then this means something is bad, either the ecu is bad or the HVAC unit is bad, any way to test this without a spare ecu or hvac unit? Do you know if it's possible to bypass the ecu and make the hvac unit trigger the compressor directly (of course if there is a way and it doesn't work it would indicate a faulty hvac unit)?

yes it is pin 9. Should go to ac compressor relay. The only pin I have missing from the equation is the GY from r33 HVAC unit that should go to pin "36", problem I have is, I don't know what pin 36 should be, I've never seen it in an R33 before, If only someone had a series 2 with loom intact that could take a pic of the GY wire and where it goes to on ecu. My only assumption is that it could be looking for engine temp sensor based on the rb26?

pin 27 is "HB66", it is in the way left of the list over the HVAC unit right connector labeled GY, it says is goes back to 36 on ecu for rb25. Even on the rb20e ecu pinout the corresponding pin is also blank.

Flag 21 comes from the thermo switch on the hvac unit's system similar to the one I have in the r33. I have that wire from the thermo amp going to pin 46 and pin 9 to the compressor. No dice yet.

pin 36 is blank on the r32 20det ecu based on the diagram, only the rb26 (gtr 32) has 36 for intake air temp sensor. but looking at that diagram I still can't pinpoint where the wire from r33 ac control unit pin 27 would go, I know the r32 has a similar setup but the pins are different.

I tried using the "search" already with different combination of words and could not find any threads on the topic, please forgive me mods. Can anyone shed some light on the differences between the 3 types and which one lasts the longest and which handles abuse best?

the r33 I have came with rb20e, it has the 2 pin pressure switch on the dryer. I have an rb20det now from r32. The original engine loom was cut up by a shoddy electrician at the time, I am trying to correct it now. If I ground the green with red strip wire for the compressor it will turn on perfectly fine, The thermo amp looks to be working, I connected what I could find regarding where they should go, the pin 36 wire is the only on I don't know where to put on the ecu. I've checked another Rb25 from an R33 and there is no pin 36 either totally blank. that r33 has a black tag ac controller where as mine has yellow tag so the wiring pinouts appear different or I could have used that to trace where the wire goes on ecu.

I have no problems with power going to the HVAC unit or any of the sensors, I just can't get the ac button to do anything with any wire, hence I am trying to find out what this pin 36 wire goes to in actuality regardless of which ecu, It is the only wire I have left disconnected and out of the whole equation, if it helps my outside ambient air temp sensor recently took a dump but these problems were there even when it was working (checked using the HVAC self diagnosis) I also fixed my hot air actuator thanks to the diagnosis.

please note that the diagrams are showing 2 different sets of ecu connectors, the rb20e and 25de/det and 26dett. also take note of the numbering KEY/LEGEND ie. *1 *2 *3 *4 as these indicate which wiring is for which car. I don't use a FICD nor relay for it on my current engine and neither did the stock rb20e that came in the chassis. ok I read your post further and realized that you saw that.

christ, I can't afford glasses right now and I'm interested to read what you're saying, lol sorry to res an old thread.

ok I hope they are clear enough, I scoured through them like liquid plumber in a drain pipe.