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Thread: Wiring the 2jz into the ma70 chassis

  1. #91
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    Roger UK's Avatar
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    Default Re: Wiring the 2jz into the ma70 chassis

    I keep meaning to do a full write up of my 2JZ conversion (like a proper idiot's guide), as I found various other notes on various websites incomplete !

    Including various other information that I couldn't find anywhere, like the Fan, Clutch Fork and Slave Cylinder, etc etc.

    I went back to the wiring diagrams and spent about 40 hours sussing everything out, then made up my own adaptors in advance so it would be plug and play. (didn't want the car to be off the road for too long)

    I actually did the engine swap and got it running with all instruments etc over a weekend!

    Regarding the earlier post about the 2JZ ECU requiring a speed signal so that you don't get a fault light, it doesn't matter that the Mk3 speed signal is much slower - as long as it receives ANY speed signal the ECU is happy.
    Photos HERE

  2. #92
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    Default Re: Wiring the 2jz into the ma70 chassis

    Hey guys, I've got a question related to this. I've got a Mk. III with a 2JZGTE and R154 and all is well, however I can't rev past 4500 RPM no matter what. In gear or out, under boost or not, etc. The ECU being used is from an automatic Mk. IV, which is where I also got the engine. I'm using a custom harness made by Dr. Tweak. I've narrowed down my troubleshooting to the neutral park sensor / switch, however I can't pinpoint the issue. I've tried going through the pin diagrams for the ECU to chassis and while there's certainly pins regarding the NPS they don't seem to be occupied, as I'm sure Tweak wouldn't have needed them in his harness as he new the circumstances regarding my car.

    I think I need to trick the ECU into thinking it's in drive so I can get past the neutral rev limiter but I'm not quite sure how - I have to depress the clutch to start the car so I know the neutral park switch situation is ok regarding that, however after starting could I set up a relay to make it think it's in drive?

  3. #93
    l33t M0derat0r (On some other forum) n00blet here however
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    Default Re: Wiring the 2jz into the ma70 chassis

    Hi guys,

    if I need connectors for the mk3 does anyone know where i can get the part numbers for these?

    http://www.supraforums.com/forum/sho...MK3-connectors.

    is what im looking for.
    87 T 2JZ-GTE
    91 T 60k Miles
    98 SC300

  4. #94
    l33t M0derat0r (On some other forum) n00blet here however
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    Default Re: Wiring the 2jz into the ma70 chassis

    Quote Originally Posted by Dirgle View Post
    IBoughtASupra is correct, and the system will work fine that way. It's the way it was designed to work with the 7M. Like the pinout says, connect pin 13 of B1 to pin 34 of E10.

    However, the 2JZ ECU has the ability to deactivate the A/C clutch under full throttle conditions so that no power is parasitically being drawn off buy the A/C system at that time. And there is a way to wire that feature in to the MKIII, but I wanted to test it first, to be sure, before I put the information out there. Unless somebody else has done it and can comment on it.

    Until then I would just connect it the way shown in the pinout above.
    Hi All,

    I'm visiting this after several years of not caring because of living in Canada. Now that i'm in California, is not a luxury, it's a must haha.

    ** update**
    B1 13 from ac amp-> to E10 34. What does this do? B1 13 from defogger idle up signal -> E10 15.

    What do the two pressure sensor AC comprssor wires go to if you are using the Aristo AC compressor? I'm guessing the aristo body connector the 1 or 2 that are not on E10 or E9?

    Basically I have G and G/R and B/W wires from the actual compressor. The B/W is supposed to go to the 1 pin connector which has 2 blue wires going in to it just behind the battery under the fuse box. Where do the others go?
    Last edited by Zazzn; March 10th, 2017 at 03:58 AM.
    87 T 2JZ-GTE
    91 T 60k Miles
    98 SC300

  5. #95
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    Kckazdude's Avatar
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    Default Re: Wiring the 2jz into the ma70 chassis

    Having not gotten to this part of my build I haven't gotten my head 100% into the wiring yet. However, Dirgle referenced connector E10 pin 34, not A34 that you are asking about. Don't know if that was a typo or to many hours looking over diagrams.

    Your compressor has a pressure sensor towards the bottom that should complete the ground circuit for the relay to engage the clutch. The other 2 wires are for the magnetic clutch.

  6. #96
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    Default Re: Wiring the 2jz into the ma70 chassis

    It looks like the original link isn't the write up anymore. Is there a new write up/link?

  7. #97
    l33t M0derat0r (On some other forum) n00blet here however
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    Default Re: Wiring the 2jz into the ma70 chassis

    yes my bad i mean E10 34 updated
    87 T 2JZ-GTE
    91 T 60k Miles
    98 SC300

  8. #98
    l33t M0derat0r (On some other forum) n00blet here however
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    Default Re: Wiring the 2jz into the ma70 chassis

    Hi All,

    2 Questions...

    #1 what did you hook up the Headlight idle up "LP" from the 7M flying lead harness? Does this go to ELS as well as the defogger? I figure both will cause an idle up condition and they are both 12V grounded at the ECU according to the TEWD. Correct me if i'm wrong.

    #2 on the AC
    E10 Pin 23 ACMG , Air Conditioning (AC) Magnetic Clutch Relay, Output , This pin is used to turn the AC magnetic clutch relay ON and is a GROUND. ECU control of the AC enables the AC to be turned off during hard acceleration. This pin is Grounded by the ECU and should run to the GROUND on the AC Mag swtich wires. So of the two wires from the compressor magnetic switch one goes to the ECU pin 23 the other goes to constant 12V+ which is the 1 pin connector by the fuse box behind the battery.

    Pin 34 - A/C , Air Conditioning (AC) Request Signal , Input , This pin is used to request that the AC be turned ON. Having an AC request input and a separate control output allows the engine ECU to turn the AC OFF under some conditions, such as hard acceleration. This pin is connected to battery voltage to request that the AC be turned ON. The AC request signal is usually generated by the climate control ECU or another name AC Amplifier, however connecting this pin to battery voltage will not guarantee that the AC is turned ON due to the conditions specified above. This should be connectd to B1 Pin 13.

    Please correct me if i'm worong on any of these.
    Last edited by Zazzn; March 12th, 2017 at 06:16 PM.
    87 T 2JZ-GTE
    91 T 60k Miles
    98 SC300

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