Chad Posted May 15, 2002 Report Share Posted May 15, 2002 86 TSI:  “A†connector 1: IGN – 2: AFS 3: n/c 4: GND (AFS) 5: Intake temp 6: Coolant temp 7: Idle SW 8: Motor Position SW 9: Pressure to gage 10: +5 volt power 11: O2 sensor 12: Ignitor signal 13: n/c 14: n/c 15: TPS 16: n/c 17: Intake temp (OVCP) 18: n/c 19: speed (coil) 20: n/c 21: Diag. Output 22: control relay (fuel pump) 23: secondary air (for catalyst) 24: pressure solenoid 86 TSI “B†connector: 1: +12V 2: GND 3: GND 4: EGR 5: IGN (cranking) 6: AC relay 7: +12V 8: Inhibitor 9: ISC + (out) 10: Injector # 1 11: ISC – (in) 12: Injector # 2 13: +12V backup 88 TSI “A†connector: -       1: IGN – -       2: AFS from A 8    3: Motor position SW -       4: GND -       5: Intake temp -       6: Coolant temp -       7: Idle SW n/c       8: n/c    n/c       9: n/c -       10: +5 volt power -       11: O2 sensor from B 11    12: ISC – (in) n/c       13: Ignitor advance n/c       14: Sensor +5 backup -       15: TPS new to AFS >    16: Barometric sensor n/c       17: n/c n/c       18: n/c -       19: Speed (coil) n/c       20: secondary air (catalyst) -       21: Diag. Output -       22: control relay (fuel pump) from B 9    23: ISC + (out) n/c       24: AC relay 88 TSI “B†connector: -       1: +12 V -       2: GND -       3: GND -       4: EGR -       5: IGN (cranking) -       6: AC switch -       7: +12 V -       8: inhibitor n/c       9: Boost gage -       10: Injector 1 (primary) from A 12    11: Ignitor signal -       12: injector 2 (secondary) -       13: +12 V backup since a different MAS is needed to convert, you may as well step up to a 1-G DSM MAS, they are cheaper and work quite a lot better. 86 AFS:       DSM  AFS: green/red       green/orange red          green/red black          green/black white/black       green/blue new > A 16       green/yellow new > +12 Switched    red n/c          green/white    Notes: >â€n/c† means “no connection†>â€-“  means “stays the same†>â€From A 8† means “remove from stock 86 connector and relocate to the 88 pin number†>On two pins, you will have to cut the wires and solder on the pin from the “A†or “B†connector, these connectors use different pins, you will have the pins you need when you start to move them.  Some move from “A†to “Bâ€, and some from “B†to “Aâ€.  Some leads may be left over, these are pins not used (if you eliminate the secondary air and the stock boost gage) This conversion also requires an 87/89 ISC assembly. The new ISC requires a +5 V supply and a ground for the new functions, because the MPS converted from a simple switch to a potentiometer, you need 2 additional wires. However, the mitsu engineers decided to add 3 wires instead, and the 3rd is un-used at the ISC end, it is the blue/yellow and literlay has no physical connection at the ISC end, either in the ISC nor in the connector itself so don't bother with it. looking at the diagrams, it shared the common ECU ground in 87/89's, so ground it anywhere. same for the +5 V, it connects to a common supply, so just find 5V at the ECU or at some other component like the TPS which is just inches away. So here's what you need to do: looking at the 87 ISC, you have a connector that has black/red, black/green and black/blue, this is the motor and idle SW. It connects as follows to the 86 harness: 87 ISC motor : 87 ISC black/red to 87 harness yellow/black (splice here) to 86 harness green/white 87 ISC black/green to 87 harness yellow/lbue (splice here) to 86 harness black/yellow 87 ISC black/blue to 87 harness yellow/red (splice here) to 86 harness yellow/red now you have the 4 pin connector with green/red, blue/red, black, and blue/yellow, this is the new MPS circuit and connects as follows: 87 MPS: 87 ISC red to 87 harness green/red (splice here) to new +5 volts 87 ISC green to 87 harness blue/red (splice here) to 86 harness green/black 87 ISC black to 87 harness black (splice here) to new ground 87 ISC red jumper to 87 harness blue/yellow to N/C leave the pins at the ECU where they are, they are correct, you simply need to add the 87 ISC, splice the 87 harness to the 86 harness where is says "splice here", and wire in the +5 and the ground Link to comment Share on other sites More sharing options...
Ray_R Posted May 15, 2002 Report Share Posted May 15, 2002 chad if im not converting my 86 to 89 ecu how do i run those last 2 wires for the DSM mas. sorry for questions. thanks Link to comment Share on other sites More sharing options...
Chad Posted May 16, 2002 Author Report Share Posted May 16, 2002 you just need 2 wires of 14-16 gage and run them from the ECU "B" connector to the MAS, you'l have to poke through the fire wall for that, but there are several places to go though. If you look on the 86 wiring chart, you can find the nessesary +12 v and ground to use for this DSM MAS. Link to comment Share on other sites More sharing options...
Ray_R Posted May 16, 2002 Report Share Posted May 16, 2002 ok got it now. thanks for all the help! Link to comment Share on other sites More sharing options...
Ramquest Posted May 17, 2002 Report Share Posted May 17, 2002 If I change ecu and injectors(I assume)with 1st dsm mas, will ISC on my 86 work ok? What kind of perf gains should I get(did you get)?Will I have to reset anything or will it just work? Link to comment Share on other sites More sharing options...
Guest Paul87Quest Posted May 17, 2002 Report Share Posted May 17, 2002 No it will not work as you need the 87-89 style ISC assembly that has a motor position sensor (the bump on the isc assembly). The ISC should be replaced with the later style to remain trouble free.... Link to comment Share on other sites More sharing options...
Ramquest Posted May 18, 2002 Report Share Posted May 18, 2002 Do I have to change my harness connection to isc or will 86 wiring work? What gains should I expect? Link to comment Share on other sites More sharing options...
Chad Posted May 22, 2002 Author Report Share Posted May 22, 2002 You do have to change the ISC, I updated my instructions in the first posing. After discussing this with Steve F, we figures it out. I never noticed the problem on mine since it idles just fine without the ISC ??? Link to comment Share on other sites More sharing options...
Ramquest Posted May 22, 2002 Report Share Posted May 22, 2002 What changes did you notice after changing?What performance did you notice? Link to comment Share on other sites More sharing options...
constar Posted January 30, 2003 Report Share Posted January 30, 2003 I have a ECU out of a 88 Conquest with a automatic. Can I use this one for my conversion? Thanks 1 Link to comment Share on other sites More sharing options...
StarWoes Posted February 5, 2003 Report Share Posted February 5, 2003 I take it converting to the '89 ECU should be about the same as the instructions for the 88 ECU or? I have the '86 Star, an 86 Shop Manual and an '89 ECU but not the '89 manual so a bit difficult for me to cross reference. :-/ :-/ If have the information available, please add to this post. Thanks.... Link to comment Share on other sites More sharing options...
mikec Posted February 9, 2003 Report Share Posted February 9, 2003 88 and 89 ECUs are virtually identical. You can replace one with the other with absolutely no wiring changes. So Chad's instructions can be used to swap in an 89 ECU as well. In fact, the 87 has the same ECU pinout so you could even swap in an 87 ECU although there'd be almost no gain at all - especially for the amount of work involved. Also, in 1987, Mitsu quit using different ECUs for automatic tranny cars vs. 5-speed cars. The ECU is identical regardless of tranny type. One of the wiring harness wires tells the ECU what kind of transmission is in the car and the ECU makes the appropriate adjustments. Thus, when doing Chad's conversion, you can use an 88 or 89 ECU from either a 5-speed or automatic equipped donor car. mike c. 1 Link to comment Share on other sites More sharing options...
StarWoes Posted February 10, 2003 Report Share Posted February 10, 2003 GRRRR8888 ;D ;D ;D you da man Mike C Link to comment Share on other sites More sharing options...
quoris Posted March 21, 2003 Report Share Posted March 21, 2003 all so the isc moter is not wired correctly. i found this out the hard way when i hooked it up and the moter went to 5,000 rpm untill i shut the moter off. just to let you know. the yellow/blue is the + for the isc motor.the yellow/black is the - for the isc motor. so the yellow/blue needs to go the the green/white, and the yellow/black goes to the black/yellow. i compaired the 86 to the 88 wiring diagram and found this out. Link to comment Share on other sites More sharing options...
Red86TSI Posted July 23, 2003 Report Share Posted July 23, 2003 What hard parts are required for this conversion? I know I'll need a 88-89 ecu and 87-89 ISC, but what about injectors? Could I use injectors from a 87-89? Someone please fill me in. Thanks, Gabe Link to comment Share on other sites More sharing options...
SidewaySStarion Posted January 1, 2005 Report Share Posted January 1, 2005 What hard parts are required for this conversion? Â I know I'll need a 88-89 ecu and 87-89 ISC, but what about injectors? Â Could I use injectors from a 87-89? Someone please fill me in. Thanks, Gabe so would this work on a 85.5 esi? if it would id like to do it? and do i need new injectors? Link to comment Share on other sites More sharing options...
Coy Posted June 5, 2005 Report Share Posted June 5, 2005 What hard parts are required for this conversion? I know I'll need a 88-89 ecu and 87-89 ISC, but what about injectors? Could I use injectors from a 87-89? Someone please fill me in. Thanks,Gabe waiting for reply to this as well. Link to comment Share on other sites More sharing options...
starquestPilot Posted June 6, 2005 Report Share Posted June 6, 2005 Me too... Mike Link to comment Share on other sites More sharing options...
Chad Posted October 25, 2006 Author Report Share Posted October 25, 2006 FOR FUTURE REFRENCE: the 87 is this: (I'VE NOW ADDED COLORS TO THE CHART) AND EDITED THE DECRIPTIONS FOR THE 87. THESE ARE STRAIGHT OUT OF AN 87 MANUAL. 87 TSI “A†connector: W 1: IGN – (coil) WB 2: AFS LR 3: Motor position SW B 4: GND GR 5: air Intake temp YG 6: Coolant temp YR 7: Idle SW 8: n/c 9: n/c GR 10: +5 volt power W 11: O2 sensor YB 12: ISC – (in) YB 13: Ignitor advance LY 14: MPS GROUND backup GW 15: TPS BW 16: Barometric sensor 17: n/c 18: n/c LgB 19: Speed (coil) RG 20: secondary air (catalyst) BR 21: Diag. Output WR 22: control relay (fuel pump) YL 23: ISC + (out) 87 TSI “B†connector: R 1: IGN +12 V B 2: GND B 3: GND RW 4: EGR BY 5: IGN START(cranking) BW 6: AC switch R 7: IGN +12 V BY 8: GROUND YG 9: Boost gage YB 10: Injector 1 (primary) BR 11: Ignitor signal FOR INJECTOR TIMING YL 12: injector 2 (secondary) B 13: +12 V CONSTANT Link to comment Share on other sites More sharing options...
Tim_C. Posted February 11, 2009 Report Share Posted February 11, 2009 bump Link to comment Share on other sites More sharing options...
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