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  • #91
    Bill, I saw that page in the book, but I can't physically find the plugs in the car... Yet.

    I'll try and simplify my understanding of how it works:
    P/N lockout relay is activated when the shifter is in either P or N, which will stop the main power feed going any further than that relay. The diodes stop power back feeding and illuminating the opposing shifter light.

    When the P/N lockout relay is NOT active then the main power feed will flow (when dash switch is on) to the activation relay. Pulling the relay in earths the TC lock solenoid which turns the solenoid on.
    When there is no power feed to the activation relay then the factory TCM circuit is complete and the TC lock will act as per normal.

    With power on the LO light relay is activated which earths the dash light for the LO indicator of the SCM.


    I deleted the brake pedal cutout because I want to be able to use full engine braking on downhill runs when towing, which means I need TC locked when braking. So I opted for an on/off switch rather then a momentary switch with hold in relay. It also simplifies the system quite a bit.

    I tow a Suzuki Sierra on a trailer a few times a year (usually over hilly terrain) so this is the main purpose of the TC lock for me. I find the 1kd runs out of breath as the revs rise, which if the TC slips (or if I kick back to 4th to stop TC slip) the revs are out of the peak torque range. If I can keep the revs low it's got the torque to keep pulling like a teenager....

    Comment


    • #92
      MRW82,

      I don't how much experience you have had with relays, relays can fail for a multitude of reasons such as dirty contacts ie don't make contact, they can stick in the operated condition if left operated for long periods, if relay is intended to be operated for long periods then a relay specified for such applications should be used.

      Contacts can also stick due to arcing over many operations, contacts used to switch inductive loads should have some form of "spark quenching" applied.

      The chances of the relay coil going open are rare with high quality relays are remote but it
      does happen. In generally now days relays are considered unreliable and only used as a cheap means of switching high currents hence why they are still widely used in cars, most other equipment these days uses electronic switching, ie FETS etc.

      Another option would be to apply power to a single relay via a transistor that is normally
      biased on and use the positive from the selector switch to turn the transistor off and prevent the relay operating. That would allow you to use the one relay again. Another alternative is to use a relay that has a high resistance coil, you could then feed the coil from earth through a resistor and then apply the positive via the isolation diodes to the coil side of the resistor to turn the relay off.

      Another option would be to source a relay with two coils, you could then use negative to turn the relay on, the other coil you would wire reverse way around to the first so that operating the selector mechanism causes the second coil to turn on via the diodes which cancels the magnetic field and relay drops out.

      I would probably go with option one.
      LeighW
      Avid PP Poster!
      Last edited by LeighW; 02-10-2014, 09:35 PM.
      HKB Electronics, manufacturer of the Alternator Voltage Booster, Silver 2008 D4D,Lifted,Underbody protection, Alternator Voltage Booster, Tiger Z winch, Lightforce DL, Air Horns, Tanami Drawers, Drop down fridge slide, Outback cargo barriers, Rotronics dual Battery system, Polaris GPS, HF/UHF/VHF, Radio speaker combiner, Long ranger water tank, Diff breathers, Inverter, Snorkel and others

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      • #93
        MRW82,

        Just looking at the schematic for the 5 speed, have you measured the operating voltages
        applied by the ECU as ECU supplies both negative and positive and the solenoids might not
        operate on 12V?
        HKB Electronics, manufacturer of the Alternator Voltage Booster, Silver 2008 D4D,Lifted,Underbody protection, Alternator Voltage Booster, Tiger Z winch, Lightforce DL, Air Horns, Tanami Drawers, Drop down fridge slide, Outback cargo barriers, Rotronics dual Battery system, Polaris GPS, HF/UHF/VHF, Radio speaker combiner, Long ranger water tank, Diff breathers, Inverter, Snorkel and others

        Comment


        • #94
          You've lost me a bit with the transistor/relay setup Leigh. I am very much an amateur when it comes to electrics, my background is mechanical. To be honest, I'm surprised I managed to come up with that diagram, I used Jamie's diagram to work from and altered it to suit.
          But I'm definitely open to suggestions so will try and get my head around your setup suggestion.
          As for the voltage, I haven't tested it but will now. It's something I wouldn't have thought of, so thank you. The last thing I want to do is let the smoke out of the wires. That's why I'm asking the questions before I hack into it.

          Comment


          • #95
            A couple of other points to consider:

            The selector switch may not like switching currents or inductive loads (causes sparks) as
            it only normally drives some leads and inputs to the ECU from memory so I would only use
            relays with high resistance coils that draw low currents and steer clear of automotive type
            relays.

            Also as your circuit will be connected to the ECU make sure any relays you use either have
            a built in spike suppressor unit, if it doesn't then make sure you put a spike suppressor
            diode across the coil.
            HKB Electronics, manufacturer of the Alternator Voltage Booster, Silver 2008 D4D,Lifted,Underbody protection, Alternator Voltage Booster, Tiger Z winch, Lightforce DL, Air Horns, Tanami Drawers, Drop down fridge slide, Outback cargo barriers, Rotronics dual Battery system, Polaris GPS, HF/UHF/VHF, Radio speaker combiner, Long ranger water tank, Diff breathers, Inverter, Snorkel and others

            Comment


            • #96
              sunny120, Hi, Are you able to email me a copy of the wiring diagram from Wholesaler Automatics lock up kit as well please mate?? I would like to see what they do with their kit. How does it go in your vehicle, are you happy with it.?? I heard they are a bit exxy.$495 + postage. My nephew has one in his 200 series and is very happy. OK here is my email ad. [email protected] Thanks and cheers Bill.

              Comment


              • #97
                MRW82
                Hi again mate, Thanks for the breakdown, you did well, but I am not very good at working it all out. I fit spotties and all but I just follow the wiring instructions. I have been looking at some sites that show how relays work and how to wire them up, so I might learn something out of this. I was thinking on the same line as you in not using the Jamies "mom" switch and the extra relay so I can use the engine and lock up for braking with the van in tow. I know that Jamie said all he has to do is hold the button down to keep it locked up, but I feel the switch will suit me better. I have a "auto lock" switch on the way as well. It sounds like what you have. This one is suited to fit straight into the Prado. LeighW has thrown in some good bits, have you had time to check out the voltage to the lock up solenoid and did you end up finding the SCM plug. I have been trying to see if I can find out anything on the Wholesale Automatics kit and what is the yellow resistor in there for. I am wondering if this is what Leigh is saying about having a resistor installed in the wiring. I noticed that Leigh makes the Alternator Voltage Booster fuse for the Prado to help with the battery. My nephew also fitted one of them. Definitely works. I will be getting one in the next week. Thanks Leigh, good one mate. I'd better get going. Hope it all works out. I'll be watching. Cheers Bill. PS has anyone heard from Jamie I would like to hear what he thinks on the new info.

                Comment


                • #98
                  MRW82
                  Mark , I just found this bit from Wholesale Automatics on the resistor in a Pajero club forum.

                  The Lock-up was first developed by us about 15 years ago and was a 12 volt input and used mainly on 80 series Toyotas and GQ patrols.
                  Later on we added the resistor for later models with more sophisticated electronics as suggested.
                  In the last 2 years we now have developed a control module that recognises the transmission type by the solenoid resistance and mimics the exact PWM signal that is operated by the factory software,
                  this insures no damage to the solenoid is possible even if the switch is overused and /or used outside our recommended parameters.
                  The will be no issues if the unit is used as suggested in the instructions.
                  Regards
                  Stuart Kitto Cheers Bill

                  Comment


                  • #99
                    Bill, I've got the wholesale automatics wiring diagram and it only covers up to 03 (the 4 speed auto). Strangely, It does have a diagram for the 1kd but it is wrong colour wiring and wrong pin, maybe for a different market.

                    Comment


                    • MRW82
                      Hi mate, I am new at all this, but can you open this up. It is a photo of a home made TC lock up kit It also has a resistor needed to fool the computer into thinking its the solenoid. Can you let me know if you can open it. I have the photo in favourites, but don't know how to insert it here. cheers Bill.
                      http://www.4x4community.co.za/forum/...0&d=1340711782

                      Comment


                      • hi Guys,
                        I've been away and missed a bit here. Just had a quick read through, but too tired to take it in properly atm. Quite interesting discussions going on. I'll have to tackle the info in a day or so when I get a mo and see whats going on.
                        Cheers, Jamie

                        Comment


                        • Hi all, have just found this bit on the homemade TC lock up in my above note for the Pajero.

                          I have been feeling uneasy about that resistor generating a fair amount of heat when the ecu allows 12volt through it. Essentially the ecu acts as ground so if it normally would lock up 12volt will pass through the resistor.

                          To combat that i have added another relay that will bypass my wiring and render the gearbox in stock form when the ecu wants to use lockup. So essentially when my switch is on and the ecu wants lockup it locks through it's own process but as soon as it unlocks my relays kick in and keeps it locked up.

                          With the switch off the gearbox wiring is essentially stock.

                          So the resisitor essentially will never see 12volt but for the split second in relays switching power around. In this method i dont know if the relay is crucial but im leaving it there to avoid the ecu maybe throwing a code.
                          Hope it may help with the Prado, Cheers Bill.
                          chardo
                          Junior Member
                          Last edited by chardo; 10-10-2014, 10:41 AM.

                          Comment


                          • Hi all, Where is everyone???? I'm lonely up here. Cheers Bill. Have a good weekend.

                            Comment


                            • Pretty sure i'll be joining this club very soon
                              [img]http://i49.photobucket.com/albums/f296/1cut808/MUMSRIG/Mitch-Prado.jpg[/img]

                              Comment


                              • Had a good chat to my auto Leckie mate and have some good info to share shortly. It will hopefully get wired up this Sunday. There are a few modifications to my diagram and adding a couple of extra relays and a resistor to keep the TCM happy so it doesn't throw codes.

                                Comment

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