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Thread: TPS Connector and Injector connectors off mk1a please

  1. #1
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    TPS Connector and Injector connectors off mk1a please

    Hi

    I am after a square type TPS Connector and the square Injector connectors off mk1a please. It will help me to test how the ecu's run with the other componants and whether adding more resistance to solenoid resistor makes car run differently to using High impedance injectors via EManage ultimate. (which requires higher impedance injectors

    I am looking into what bits run with what so that if someone has a non runner then the part numbers can be matched up easily, or also for anyone who wants to mod their cars setup. They will know what they will need to do so that the fuelling can be modified without ecu failure etc.

    I would like to get this info (below) accurate and make it a sticky on the site so it can be used by others... I have concluded the following from research on this site and others around the net

    It seems that there are 3 ECU's and 3 types of injector for our UK cars
    89661-17030 Nov 1984 to Aug 1986 injectors are grey and high impedance 13.8 Ohms - need to research config of this but if you run an early ecu on a later car then fuses blow apparently!
    89661-17070 Aug 1986 to Aug 1987 injectors are Red but square connector and high impedance 2.3 Ohms wired in parallel with a 2-3 Ohm resistor pack = 4.15 Ohms load per channel on ECU
    89661-17140 Aug 1987 to Dec 1989 injectors are pink with rounded connector and low impedance 2.3 Ohms wired in parallel with a 2-3 Ohm resistor pack = 4.15 Ohms load per channel on ECU

    TO go with the ECU's above there are 3 x TPS for the UK car
    Throttle position sensors:
    89452-28010 AISIN - Nov 1984 to Aug 1986 (square plug connector)
    89452-20070 Denso - Aug 1986 to Aug 1987 (square plug connector)
    89452-12040 Denso - Aug 1987 to Dec 1989 (round plug connector)

    Can anyone confirm this info is correct ?

    Jonathan

  2. #2
    MR2 Obsessive jimi's Avatar
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    These are the part numbers from the EPC that apply to UK MK1's
    89452-28010 (11/1984 - 07/1986)
    89452-20070 (08/1986 - 07/1987)
    89452-12040 DENSO
    89452-12050 AISIN
    But I have no idea which shape plugs they have
    Black is not a colour ! .... Its the absence of colour

  3. #3
    MR2 Obsessive jimi's Avatar
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    This can't be correct
    It seems that there are 3 ECU's and 3 types of injector for our UK cars
    89661-17030 Nov 1984 to Aug 1986 injectors are grey and high impedance 13.8 Ohms - need to research config of this but if you run an early ecu on a later car then fuses blow apparently!
    89661-17070 Aug 1986 to Aug 1987 injectors are Red but square connector and high impedance 2.3 Ohms wired in parallel with a 2-3 Ohm resistor pack = 4.15 Ohms load per channel on ECU
    89661-17140 Aug 1987 to Dec 1989 injectors are pink with rounded connector and low impedance 2.3 Ohms wired in parallel with a 2-3 Ohm resistor pack = 4.15 Ohms load per channel on ECU
    Both statements can't be correct. Normally if the resistance is between 1.5 and 4.0 Ohm they are low impedance injectors and if the resistance is between 8 and 16 Ohm they are high impedance injectors.
    Black is not a colour ! .... Its the absence of colour

  4. #4
    MR2 Obsessive jimi's Avatar
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    Also the load calculation doesn't make sense, 4 x 2.3 Ohms in parallel with 2 or 3 Ohms doesn't equal 4.5 Ohms more like 0.45 Ohms
    Black is not a colour ! .... Its the absence of colour

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    Click image for larger version. 

Name:	mr2 inj diagram.jpg 
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    I calculated it from the manual. Please can you correct it if I have made an error ?
    EDIT (YES I DID MAKE AN ERROR)
    I Hadn't noticed the link between #10 and #20... So 2 x 4.15 Ohm resistors in parallel equal 2.07ohms and the load is on both #10 and #20.
    I looked inside the ECU and both the channels are joined in the ECU ending in 070 and also the ecu ending 140 and the injectors all fire together as a batch


    The injectors are driven in pairs and they sit in parallel to each other. 2 injectors with 2.3ohms each in parrallel is
    1/2.3+ 1/2.3 = 0.87 and then 1/.87 = 1.149 (1.15)

    1.15+ 3 ohms = 4.15 ohms for the loading on the no10 ECU input and the same again for the number 20 input

    Both facelift cars run low impedance resisters so I thought the results would be the same for both as I have ran my Car on the 17140 and 17070 ecus and apart from TPS scaling being different the car runs but the fuel map is rather wild.

    The High impedance denso injectors are 13.5 Ohms each and there is no resistor pack. I would like to see if the older ECU drives them in pairs or not though, but I dont think I have a diagram for the older 17030 ecu - do you ?

    Thanks for replying :0)

    Maybe this post should be moved by a moderator ?

    Jonathan
    Last edited by Evo4Jon; 13th January 2017 at 01:52 AM.

  6. #6
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    Quote Originally Posted by jimi View Post
    These are the part numbers from the EPC that apply to UK MK1's
    89452-28010 (11/1984 - 07/1986)
    89452-20070 (08/1986 - 07/1987)
    89452-12040 DENSO
    89452-12050 AISIN
    But I have no idea which shape plugs they have
    I looks on google iages to see the TPS design based on part numbers and you can see on there of they are round or older square connector. The TPS ending in 050 is a rounded plug and off a super charger 4AGZE I think

  7. #7
    MR2 Obsessive jimi's Avatar
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    The number ending in 050 is from the Toyota EPC for Europe which doesn't include GZE parts numbers but I couldn't say if any UK MK1's use it only that it's listed in the EPC under a UK VIN number.
    My apologies, I didn't realise the injectors are wired in pairs which makes your calculation correct. Depending on the resistance of the solenoid resistors you get value of between 3.15 and 4.15 ohms per input. I may have a drawing for the earlier ECU, I'll have a look.
    Black is not a colour ! .... Its the absence of colour

  8. #8
    MR2 Obsessive jimi's Avatar
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    Just had another look at the drawing an it shows a link between 10 & 20 which changes the calculation. It means that both sets of injectors are in fact in parallel which changes the value to 1.575 - 2.075 ohms. Also means that according to that drawing all the injectors fire at the same time ??
    Black is not a colour ! .... Its the absence of colour

  9. #9
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    I assumed that the 10 input would ground injectors 1 and 2 and the 20 would ground 3 and 4 as per firing order of 1342 so only the resistance inline with current flow would be utilised. If they were fired at same time then no need for 2 inputs to ecu.

    Looking at the resistor on the car you will see it has 3 wires: a bat voltage+ and res1 and res2.
    The resistors are separate to each other only joined by a common input V+. If 10 and 20 trigger (ground out) the circuit separately, then the 2 resistors will never form a parallel layout. This would only happen if both 10 and 20 were triggered (grounded out) at the same time.
    Last edited by Evo4Jon; 9th January 2017 at 10:27 AM.

  10. #10
    MR2 Obsessive jimi's Avatar
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    You would think so, but the link between 10 and 20 means if you ground one you ground them both. The drawing for a car with an AFM doesn't show the link
    Black is not a colour ! .... Its the absence of colour

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