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Registered:
November 2002
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 EFI Banana in Pyjamas ???
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Fri, 20 May 2005 10:54
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Can someone please tell me what the "+B" and "+B1" circuits do in a Toyota EFI / ECU ?
Do they supply a constant power feed and the circuit is only active when the EFI earths the other wire ?
How do you test these circuit with a multimeter to prove that they work ?
Is it B1 and B2 coming down the stairs ???? 
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Location:
Bottom of the hill, Sydney
Registered:
April 2004
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Re: EFI Banana in Pyjamas ???
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Fri, 20 May 2005 11:03
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According to a diagram for the 4AGE 100kw, "+B" and "+B1" give power to the ecu via the 15a efi fuse and the efi main relay when the ignition is turned on.
Hope that makes sense .
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Registered:
November 2002
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Re: EFI Banana in Pyjamas ???
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Fri, 20 May 2005 11:50
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It does.
Can you please tell me what the purpose of these wires is if they run back from various sensors, like VSV's and the supercharger, to the ECU ?
Thanks.
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Location:
Bottom of the hill, Sydney
Registered:
April 2004
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Re: EFI Banana in Pyjamas ???
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Fri, 20 May 2005 12:03
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From what I can gather from the 4age 100kw wiring diagram that I have, it is an ignition supply to the ecu and vsv. What engine are you using and do you have a link to a wiring diagram for your engine that I can look at?
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Registered:
November 2002
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Re: EFI Banana in Pyjamas ???
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Fri, 20 May 2005 12:17
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I have a Gen 3 1G-GZE but no exact wiring digram for it.
I want to test the 'power' and 'earth' wires to the two VSV's and the SC clutch relay, but I think I am testing it wrong as I assumed the two +B1 wires were actually the earths, and the power came down the switch wires.
How do you test the VSV's ?
Thanks.
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Location:
Bottom of the hill, Sydney
Registered:
April 2004
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Re: EFI Banana in Pyjamas ???
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Fri, 20 May 2005 12:51
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I just had a quick look at the 1G-GTE diagram in the tech docs and it looks like the +B1 wire gives ignition supply to the vsv and it earths through the ecu. I assume this is similar for the 1G-GZE.
As for testing the vsv, you could disconnect the wires and check the resistance across the two terminals on the vsv to make sure it is not open circuit. I don't know what specific resistance reading you should have across these terminals. Maybe someone else can help in that area but I do know you should have a circuit through it.
Also make sure you have an ignition supply to it.
Hope this helps.
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Registered:
November 2002
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Re: EFI Banana in Pyjamas ???
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Fri, 20 May 2005 12:57
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Brad,
This helps heaps...I will check the VSV's for (some sort of) resistence reading and not open circuit, and the wires for 12v on ignition.
Thanks,
Mitch.
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