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Registered:
November 2002
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 Help Please: +B and +B1 Wiring Q ?
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Mon, 23 May 2005 02:12
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I need some help with checking wiring on my 1G-GZE that is not working.
I have a later model Crown ECU on my earlier model Crown GZE motor, and by comparing the pins on the two ECU boards, I notice that +B and +B1 are swapped over. I don't have the exact correct ECU for my engine, but I know a guy who does for his engine, so we are comparing notes.
I think that both these 'B' circuits get a continuous 12v supply once the engine is started. Correct me if I am wrong.
I understand that if any sensor/valve/device is on either +B or +B1 it is switched on by the ECU earthing the other wire that runs to that device.
So, is it critical to have +B and +B1 correct is what circuits that they power ? Or will they work if swapped around ?
Thanks,
Mitch.
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Help Please: +B and +B1 Wiring Q ?
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Mon, 23 May 2005 02:15
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On the 7MGTE B+ and B1+ are the same source.
It just bridges at the ecu.
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Location:
Terrigal
Registered:
May 2002
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Re: Help Please: +B and +B1 Wiring Q ?
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Mon, 23 May 2005 02:22
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Yeah all the +b, b1+ wires I have seen join together and get power from the main efi relay.
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: Help Please: +B and +B1 Wiring Q ?
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Mon, 23 May 2005 03:11
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Same source, different names, keep going 
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: Help Please: +B and +B1 Wiring Q ?
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Mon, 23 May 2005 03:25
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as stated above.
"EFI main" is just a power relay that turns on when you turn the key to IGNITION, and gives power to the ECU and most of the engine electrics like coils and injectors etc.
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Registered:
November 2002
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Re: Help Please: +B and +B1 Wiring Q ?
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Mon, 23 May 2005 05:28
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Guy's,
Thank you one and all for the quick and informative responses, and yes, Frank, I will just have to keep on looking !!!
Thanks mate !!!
Cheers,
Mitch.
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: Help Please: +B and +B1 Wiring Q ?
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Mon, 23 May 2005 05:32
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Did you sort out those S/C wires?
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Registered:
November 2002
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Re: Help Please: +B and +B1 Wiring Q ?
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Mon, 23 May 2005 05:37
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Exactly what I am working on now.
I think I have a newer SC plugged into an older engine, in that the SC is, via its relay, eventually connected into the grey round 2 pire loom plug, with a yellow 2 wire round plug.
Yellow and grey don't match, so methinks a stuff up here.
Questions are, can I run the SC without its relay ?
How should I wire the SC directly ?
The SC has a green w white (power) and a white w black (earth).
When I give 12v direct to the green w white it pulls the clutch in (yay !)
Grey loom plug is black w red (+B1) and red, which has continuity with the blue w yellow S/C control pin at the ECU.
What do you reckon ?
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Help Please: +B and +B1 Wiring Q ?
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Mon, 23 May 2005 05:41
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Wire the clutch in directly and take it for a spin.
Btw, what exactly is the problem?
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Registered:
November 2002
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Re: Help Please: +B and +B1 Wiring Q ?
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Mon, 23 May 2005 06:05
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The problem is almost no power right through the rev range, and no boost no matter what conditions the engine is running in.
Early (85-87) 1GGZE's have a plug with 2 wires running to the S/C clutch while mine only has the one. So I guess I need a relay in there somewhere.
I can give it 12v direct full time, but won't my fuel mixtutes be too lean for the pressurised air ?
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: Help Please: +B and +B1 Wiring Q ?
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Mon, 23 May 2005 06:13
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It's usually on all the time isn't it, just off at idle? Regardless, if the air is passing through the AFM, it should fuel for it.
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Registered:
November 2002
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Re: Help Please: +B and +B1 Wiring Q ?
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Mon, 23 May 2005 06:16
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Yes, off at idle, off when the engine is cold, but otherwise on
all the other times.
Would it help if I described the current wiring set-up just around the SC?
There is probably only two wires that I could swap anyway.....
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: Help Please: +B and +B1 Wiring Q ?
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Mon, 23 May 2005 06:24
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The wiring wouldn't make any sense over the internet without any prior knowledge. Try swapping the wires if you think you've really got them around the wrong way. Failing that, 12V the sucker.
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Registered:
November 2002
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Re: Help Please: +B and +B1 Wiring Q ?
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Mon, 23 May 2005 09:58
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I will wire it up as per the Gen 2 motor, effectively bypassing the SC relay. So +B1 brings constant 12v power, signal wire from ECU says go.
I found a second wire on the SC clutch, it runs for an inch to a local earth on the SC housing, so that is what I will use to run the thing.
BTW, this SC relay I have, has me stumped. Only has a Nippondenso part number on it, has 70.5 Ohm resistence, and the diagram on the side shows two pins form a switch, while the other two run either side of a rectangle in the circuit. Its all inside a rubber booted condom thingy. What could trigger this relay to work ? Ambient air temp, air pressure, drop bears warning ?
Thanks,
Mitch.
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Location:
Brisbane
Registered:
May 2002
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Re: Help Please: +B and +B1 Wiring Q ?
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Mon, 23 May 2005 11:46
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| ra23celica wrote on Mon, 23 May 2005 19:58 |
BTW, this SC relay I have, has me stumped. Only has a Nippondenso part number on it, has 70.5 Ohm resistence, and the diagram on the side shows two pins form a switch, while the other two run either side of a rectangle in the circuit. Its all inside a rubber booted condom thingy. What could trigger this relay to work ? Ambient air temp, air pressure, drop bears warning ?
Thanks,
Mitch.
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Sounds like a normal relay to me.
Look up the way relays work (pass current thought a winding to create a magnetic field which in turn pulls the switch closed pretty well)....the two pins that goto the black box are used to trigger the other two pins to connect. i.e. gnd one side of the rectangle in the circuit and add 12v to the other and the relay will close/open depending on if its normally open or normally closed 
Cheers
Wilbo
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Location:
Brisbane
Registered:
August 2004
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Re: Help Please: +B and +B1 Wiring Q ?
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Mon, 23 May 2005 12:03
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With my 1GGZE, i can drive around all day gently without the S/C enguaging, still plenty of torque, just a quick press on the gas turns it on - as soon as there is enough load i find.
Glen.
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Registered:
November 2002
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Re: Help Please: +B and +B1 Wiring Q ?
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Tue, 24 May 2005 02:40
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Thanks again everyone for your advice.
I have another relay question to ask but I will start a new thread for that one.
Glen - thanks for chiming in here as well, sorry to start conversations across two e-mail addresses. My family is all sick with the flu so I at home looking after them.
I will get back to you on the other thread when I get back to work.
Thanks.
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